Commerce City PFAS Water Contamination: What 75,000 Residents Need to Know About the South Adams County Lawsuit Against Denver
You live in Commerce City, or somewhere in the South Adams County Water and Sanitation District, and you just learned that the water you drank, cooked with, and bathed in for years may have been contaminated with “forever chemicals” from a firefighting training facility in Denver. You are scared. You are angry. And you probably have a dozen questions racing through your mind at 2 a.m. — is the water safe now? Was it safe five years ago? Ten? What does PFAS actually do to a body? Does my family have legal rights separate from the water district’s lawsuit?
We are going to answer every one of those questions. Not in a brochure. Not in a “consult an attorney” hedge. In the specific, lived language of a trial team that handles toxic-exposure cases — the law, the medicine, the money, the evidence, and the defense playbook — because the person reading this page deserves to understand exactly what they are in and exactly what can be done about it. If you are one of the approximately 75,000 people served by the South Adams County Water and Sanitation District, this page is for you.
The lawsuit the water district filed against the City and County of Denver is a municipal cost-recovery action — it seeks to force Denver to pay for the $80 million treatment plant, the tens of millions in prior remediation, and the ongoing operational costs of filtering PFAS out of the water supply. That case is real and important. But it is not your case. Your case — if you or a family member has a PFAS-associated illness, or if you want medical monitoring to catch one early — is an individual toxic tort claim that runs on a different clock, against potentially different defendants, and requires its own legal evaluation. The two cases are connected by the same contamination, but they are not the same lawsuit. That distinction is where this page begins.
What Happened: PFAS Contamination from Denver’s Roslyn Fire Training Facility
The South Adams County Water and Sanitation District filed its lawsuit alleging that the City and County of Denver, through its Roslyn Fire Training Facility at 5440 Roslyn Street, contaminated the district’s raw water supply for decades with PFAS-laden firefighting foam runoff. The district discovered the contamination in 2018. The lawsuit alleges the pollution is ongoing — meaning the chemicals are still moving through groundwater toward South Adams County wells today.
Here is the mechanism in plain language. Firefighting training facilities use aqueous film-forming foam — known as AFFF — to simulate and suppress liquid-fuel fires. AFFF is loaded with per- and polyfluoroalkyl substances, the family of chemicals called PFAS. These are the “forever chemicals” you have been hearing about. They are called that for a reason: they do not break down in the environment. They do not break down in the human body. Once they are in the ground, they move. Once they are in the water, they persist. Once they are in your blood, they stay — for years.
The Roslyn facility sits in northeast Denver, near the former Stapleton International Airport site — an area with a long history of aviation and industrial use where AFFF foam training exercises would have sent runoff into surrounding soil and groundwater. South Adams County lies immediately north of Denver in the South Platte River corridor. Regional groundwater flow patterns generally move northward from Denver toward Adams County. That is the contaminant migration pathway the lawsuit alleges — the chemicals traveled through the alluvial aquifer from the fire training facility downgradient into the well fields that supply drinking water to Commerce City and the surrounding communities.
The district also believes some of its wells may have been contaminated by firefighting-related runoff from the former Stapleton airport itself, which is a separate potential source that any thorough investigation would examine.
The Numbers: How Far Above the Legal Limit
The contamination levels in this case are not marginal. They are staggering.
The EPA’s National Primary Drinking Water Regulation, finalized in April 2024, set the maximum contaminant level for PFOA and PFOS — two of the most common and most studied PFAS compounds — at 4.0 parts per trillion. To put that in perspective, 4.0 parts per trillion is roughly equivalent to four drops of contaminant in twenty Olympic swimming pools. The EPA set the health-based Maximum Contaminant Level Goal — the level at which there is no known or expected risk to health — at zero. That means the federal government’s own scientists determined there is no amount of these chemicals in drinking water that carries no risk.
Now compare that to what the lawsuit says was found in the ground:
- District wells measured as high as 342.6 parts per trillion of PFOA and PFOS combined — roughly 85 times the federal limit.
- Groundwater beneath the Denver facility showed PFOS concentrations at the northern end of the site exceeding 6,600 parts per trillion.
- Groundwater near the eastern part of the site showed PFOS concentrations exceeding 20,000 parts per trillion — that is 5,000 times the federal drinking water limit.
- Groundwater north and downgradient of the fire training facility — the direction of South Adams County — ranged as high as 2,870 parts per trillion.
“EPA is finalizing… individual MCLs for PFOA and PFOS at 4.0 nanograms per liter (ng/L) or parts per trillion… and is finalizing health-based Maximum Contaminant Level Goals (MCLGs) for PFOA and PFOS at zero.”
— PFAS National Primary Drinking Water Regulation, 89 Fed. Reg. 32532 (April 26, 2024)
These numbers are not a rounding error. They are not a trace detection. They represent contamination at levels that the federal government has determined are unsafe for human consumption at any sustained concentration — and the levels beneath the source facility are orders of magnitude beyond that.
Who Is Affected: The 75,000 Residents of South Adams County
The South Adams County Water and Sanitation District serves approximately 75,000 people, anchored by Commerce City in Adams County, Colorado. If you live in this area and receive your water from the district, you are within the population the lawsuit identifies as affected.
Here is what you need to understand about the exposure window. The district discovered the contamination in 2018. The lawsuit alleges the contamination lasted decades and is ongoing. That means if you lived in the district and drank the water at any point during the years or decades before 2018 — and potentially after — you may have been exposed to PFAS at levels the federal government now says are unsafe. The district has taken aggressive corrective action: shutting off contaminated wells, building an $80 million treatment facility, purchasing dilution water from Denver Water at a cost of $2.75 million in 2022 alone, and changing costly filters more frequently to eliminate PFAS. Your current water is being treated. But the exposure that already happened cannot be undone.
Commerce City and the surrounding Adams County communities sit along the I-270 and US-85 corridors — areas that have historically borne a disproportionate share of environmental exposure from concentrated industrial activity. The Suncor Energy refinery nearby is a separate facility with its own contamination concerns, though officials have stated no PFAS connection to Suncor has been established. The point is that this community is no stranger to the pattern of industrial contamination, and the law takes that history into account.
Your Legal Rights Are Separate from the Water District’s Lawsuit
This is the distinction that matters most to you as a resident. The South Adams County Water and Sanitation District’s lawsuit is a cost-recovery action. It seeks to make Denver pay for the infrastructure and operational costs of cleaning PFAS out of the water supply — the treatment plant, the filter replacements, the dilution water purchases, the past and future expenses. That is the district’s case.
Your case — an individual toxic tort claim — is different. If you or a family member has developed a condition associated with PFAS exposure, or if you want medical monitoring to detect such conditions early when they are most treatable, you may have legal rights that are entirely separate from the district’s lawsuit. Individual claims can seek compensation for medical monitoring, personal injury, and other damages that the water district’s cost-recovery action does not cover.
A toxic tort claim is the legal vehicle for an individual who has been harmed by exposure to a dangerous substance. It is built on different legal theories, runs on a different statute-of-limitations clock, and may name different defendants than the municipal cost-recovery action. Understanding which path is yours — and whether both paths may be available — is one of the most important early decisions in any PFAS case.
The Law: How PFAS Contamination Cases Work in Colorado
PFAS contamination cases operate at the intersection of federal environmental law, Colorado state law, and common-law tort doctrine. The legal architecture is layered, and each layer provides a different tool for holding the responsible parties accountable.
CERCLA: The Federal Cleanup Cost Recovery Hammer
The federal Comprehensive Environmental Response, Compensation, and Liability Act — known as CERCLA or the Superfund law — is the primary framework for the water district’s cost-recovery action against Denver. In May 2024, the EPA designated PFOA and PFOS as CERCLA hazardous substances, effective July 8, 2024. That designation was a watershed moment for PFAS litigation because it brought these chemicals within the reach of the most powerful environmental cleanup statute in federal law.
CERCLA liability is strict, joint and several, and retroactive. In plain English:
- Strict means the defendant does not have to be proven careless. If it owned the facility, operated it, generated the waste, or transported it to the site, it can be held liable regardless of its intent or care level.
- Joint and several means that any one responsible party can be tapped for the entire cleanup cost — the plaintiff does not have to apportion fault among multiple defendants.
- Retroactive means the liability reaches conduct that occurred decades ago, before CERCLA was enacted in 1980, and before PFAS were designated as hazardous substances in 2024.
The only statutory defenses to CERCLA liability are three: an act of God, an act of war, or an act or omission of a third party (with specific conditions). “We were following the rules at the time” is not one of the defenses. “The FAA told us to use this foam” is not one of the defenses. The Superfund law was written to make the polluter pay, and it does so with a very narrow set of escape hatches.
For the South Adams County water district, this framework provides a relatively clear path: Denver owned and operated the Roslyn Fire Training Facility; PFAS from that facility contaminated the district’s water supply; PFAS are now designated CERCLA hazardous substances; and the district has incurred cleanup costs exceeding $80 million plus ongoing operational expenses. The CERCLA cost-recovery action seeks to shift those costs to the responsible party.
Colorado Common Law Claims: Nuisance, Trespass, Negligence, Strict Liability
Beyond CERCLA, the lawsuit and any individual claims can draw on Colorado common law doctrines that have protected property and water rights for centuries:
Continuing nuisance. The lawsuit alleges the PFAS contamination is ongoing. A continuing nuisance is a condition that unreasonably interferes with the use and enjoyment of property — here, the district’s water supply rights. The “continuing” designation is critical because it means the claim does not become stale as long as the nuisance persists. The persistence of forever chemicals that do not break down in the environment strengthens this theory powerfully. Each day the contamination continues is a new day of nuisance.
Trespass to property and water rights. PFAS migration from Denver’s facility onto and into South Adams County’s well fields and water supply infrastructure constitutes a physical invasion of the district’s property — regardless of whether Denver intended the intrusion. Trespass does not require intent to harm. It requires a physical entry onto another’s property. PFAS molecules entering the district’s wells are a physical entry. This is a clean, powerful theory.
Negligence and failure to warn. Denver had a duty to contain and manage toxic runoff from its firefighting training operations. The allegation is that over decades, despite growing scientific awareness of PFAS hazards, Denver failed to implement adequate containment, monitoring, or remediation measures. The growing body of scientific evidence about PFAS toxicity — evidence that was accumulating in the scientific literature for years before the public became broadly aware — is central to establishing what Denver knew or should have known.
Strict liability for abnormally dangerous activity. Colorado law, like the law of many states, recognizes that certain activities are so inherently dangerous that the entity conducting them is liable for harm that results, regardless of how careful it was. Storage, use, and discharge of persistent bioaccumulative toxic chemicals in firefighting training that foreseeably contaminated regional water supplies may qualify as an abnormally dangerous activity. If it does, Denver’s liability does not depend on proof of negligence at all.
Products Liability Against AFFF Manufacturers
The AFFF foam itself was designed, manufactured, marketed, and sold by major chemical companies — including entities like DuPont, 3M, and their corporate successors. Colorado Attorney General Phil Weiser has already joined other states in suing these manufacturers for the costs of cleaning up water supplies, rivers, and other damage. That parallel litigation reinforces the viability of a products liability theory: the manufacturers face strict liability for design defect, failure to warn, and breach of warranty claims.
For individual residents, this means the universe of potentially responsible parties is broader than just the City and County of Denver. The company that made the foam, the company that sold it, and the entity that used it may all bear responsibility — and the law allows claims to be structured to reach each of them.
The Colorado Governmental Immunity Act and Individual Claims
If you are considering an individual claim against the City and County of Denver — as opposed to the water district’s CERCLA action — you need to understand the Colorado Governmental Immunity Act, known as the CGIA. The CGIA can limit tort claims against public entities in Colorado. It requires that a notice of claim be filed within a statutory period that can be short — potentially as brief as 90 days from the date you discover your injury. It also defines specific immunity exceptions that determine whether and how a public entity can be sued.
The CGIA’s notice requirement is a trap for the unwary. A resident who develops a PFAS-associated condition years after exposure and waits to “see how it plays out” can lose the right to sue Denver entirely — not because the case is weak, but because the notice window closed. If your claim involves a governmental entity, the notice clock is one of the first things a lawyer should evaluate. Confirm the current CGIA notice deadline and applicable immunity exceptions with an attorney immediately — this is not a deadline to gamble with.
Colorado’s Statute of Limitations and the Discovery Rule
Colorado’s statute of limitations for personal injury actions generally runs about two years from the date the injury is discovered. But PFAS-related diseases are latent — they can take years or decades to develop after exposure. Colorado, like most jurisdictions, applies a discovery rule that can delay the start of the limitations clock until the plaintiff knew or should have known of the injury and its cause.
For a Commerce City resident who develops kidney cancer in 2026 and only now learns that PFAS contamination may have caused it, the question of when the clock started running is not simple. It depends on when the person knew or reasonably should have known that their disease was connected to PFAS exposure. This is a legal determination that requires careful analysis of the specific facts — when you lived in the district, when you learned about the contamination, when your condition was diagnosed, and what information was publicly available at each point.
There is also a risk that some states impose an outer deadline — a statute of repose — that can cut off a claim even before discovery. Whether Colorado applies such a deadline to toxic tort claims is a question that requires current legal research. The safe approach is to assume the clock is running and get a legal evaluation promptly.
Colorado’s Comparative Negligence Rule
Colorado follows a modified comparative negligence system. In plain terms, your own share of fault can reduce your recovery — and if your share exceeds a certain threshold, it can bar recovery entirely. In a PFAS contamination case, comparative fault is less relevant for residents who simply drank the water provided to them — you did not choose to expose yourself to PFAS. The water district, as an innocent party that incurred cleanup costs through no fault of its own, faces even less comparative-fault exposure. But the defense will look for any angle to assign fault to the plaintiff, so the doctrine matters.
The Defendants: Who Can Be Held Accountable
A PFAS contamination case of this scale typically involves multiple layers of responsibility. The first layer is the entity that used the foam. The second is the entity that made the foam. The third is any other entity whose activities contributed to the contamination. Each layer is a separate investigation and a separate source of potential recovery.
The City and County of Denver
Denver owns and operates the Roslyn Fire Training Facility at 5440 Roslyn Street — the identified source of PFAS-laden firefighting foam runoff. The lawsuit names Denver as the defendant. Denver’s City Attorney’s Office had not yet been served with the lawsuit at the time of the initial reporting and did not have a comment, but the district’s manager, Abel Moreno, said the water district had talked with Denver for years about the contamination and possible compensation before reaching an impasse that led to filing.
Denver’s potential defenses are worth understanding because they shape the fight. Denver may argue that it was required or encouraged by federal aviation regulations to use AFFF containing PFAS at its facilities — the FAA and DOD historically mandated or approved the use of AFFF at airports and military installations. This is a regulatory compliance defense: “we were following the government’s rules.” Under CERCLA, this defense faces a steep uphill climb because CERCLA’s strict-liability framework does not recognize regulatory compliance as an escape hatch. Under common law negligence theories, the defense has more traction but can be countered by evidence that Denver knew or should have known about the PFAS hazard and failed to implement available containment or remediation measures.
Denver may also argue that the contamination came from other sources — the former Stapleton airport, the nearby Suncor refinery, or other industrial activity in the corridor. The district has stated that no PFAS connection to Suncor has been established, but the Stapleton site is a separate potential source that warrants investigation. Apportionment — the argument that only part of the contamination came from the Roslyn facility — is a defense strategy that can reduce Denver’s share of liability but does not eliminate it entirely under CERCLA’s joint-and-several framework.
AFFF and PFAS Manufacturers
The companies that designed, manufactured, marketed, and sold aqueous film-forming foam products containing PFAS chemicals face a separate and powerful theory of liability: products liability. The Colorado Attorney General has already joined other states in suing manufacturers like DuPont for cleanup costs. This parallel litigation is not just background — it is evidence that the manufacturers’ own conduct is under legal scrutiny at the highest level.
Products liability against chemical manufacturers can include:
- Design defect — the foam was designed with PFAS when safer alternatives existed or could have been developed.
- Failure to warn — the manufacturers knew or should have known about the health and environmental risks of PFAS and failed to adequately warn users.
- Breach of warranty — the product did not perform as safely as an ordinary buyer would expect.
The manufacturers are deep-pocket defendants with global operations. 3M, for example, has already agreed to pay billions to settle public water provider claims related to PFAS contamination. DuPont, Chemours, and Corteva reached their own multi-billion-dollar settlement with public water providers. These settlements are for water system cleanup — they are not individual injury settlements. But they demonstrate that the manufacturers have accepted financial responsibility for PFAS contamination at a scale that validates the legal theory.
Potential Additional Responsible Parties: The Stapleton Airport Site
The article references possible PFAS contamination from firefighting-related runoff at the former Stapleton International Airport. Any entity that conducted AFFF training or stored PFAS foam at that location may share liability for downgradient contamination. The Stapleton site is identified as a discovery target — meaning it is something the lawsuit’s discovery process should investigate, not something that has been definitively established as a source. But the hydrogeology of the Denver-Adams County corridor, with groundwater flowing northward from Denver toward Adams County, makes any PFAS source along that pathway a potential contributor to the contamination found in South Adams County wells.
The Evidence Clock: Records That Disappear
Every toxic tort case lives or dies on evidence. In a PFAS contamination case, the evidence is voluminous — but it is also perishable. Records disappear on retention schedules. Key decision-makers retire or transfer. Sampling data that established the timeline and concentration levels can be purged. Understanding what evidence exists, who holds it, and how fast it can legally die is the foundation of both the water district’s cost-recovery action and any individual resident’s claim.
Historical Well Water Sampling Data
The timeline, concentration levels, and geographic spread of PFAS contamination are established by historical well water sampling data from both the South Adams County district and the Roslyn Fire Training Facility site. These records establish when the contamination was discovered, how concentrated it was, and where it spread. They are critical for proving duration, source, and causation. These records should exist in agency databases, but they may face retention schedule purges. Litigation hold letters should issue immediately to preserve all sampling data — and for any individual resident’s case, the earlier this evidence is preserved, the stronger the causation argument.
AFFF Procurement, Inventory, and Usage Records
The volume, frequency, and duration of PFAS-containing foam use at the Roslyn facility and the former Stapleton airport are established by procurement records, inventory logs, and usage documentation. These records directly link Denver’s activities to the contamination source. Older procurement records may be archived or subject to destruction schedules. City records retention policies vary by document type, and decades-old records may already be gone — or may exist in archives that require formal records requests to access.
Hydrogeological and Groundwater Flow Studies
The contaminant transport pathway — how PFAS traveled from Denver’s facility through the alluvial aquifer to South Adams County’s wells — is established by hydrogeological studies and groundwater flow modeling. This is the causal link between source and injury. Existing studies may be available, but groundwater conditions change over time, and current data may not reflect historical plume dynamics. Additional sampling and modeling may be needed to reconstruct the historical migration pathway.
Internal Denver Communications Regarding PFAS Awareness
Perhaps the most consequential evidence in any PFAS case is the internal timeline of what the defendant knew and when. Internal Denver communications regarding PFAS awareness, containment decisions, and remediation considerations are central to negligence claims, punitive damages theories, and the overall narrative of accountability. Email retention policies typically cycle within one to seven years. Key decision-makers may retire or transfer, making their deposition testimony time-sensitive. This is the evidence most likely to “disappear” — not through malice, but through routine retention cycling. The urgency of securing these communications cannot be overstated.
EPA and CDPHE Regulatory Correspondence
The Colorado Department of Public Health and Environment has run PFAS testing programs that identified contamination at more than 100 local water agencies statewide. EPA and CDPHE regulatory correspondence, compliance reports, and enforcement records document regulatory awareness and any compliance failures or enforcement actions related to PFAS at the facility. Federal and state agency records are generally preserved, but FOIA and Colorado Open Records Act requests should be filed promptly to obtain them.
Treatment Plant Construction Invoices, Operational Cost Records, and Filter Replacement Logs
For the water district’s cost-recovery action, the economic damages are quantified with precision through construction invoices, operational cost records, and filter replacement logs. The $80 million treatment plant cost, ongoing operational expenses, and accelerated filter degradation rates are all documented in active financial records. These must be preserved for damages proof — but because they are active financial records, they should be current and accessible.
Denver Water Dilution Purchase Agreements and Billing Records
The $2.75 million the district paid in 2022 alone for Denver Water supply to dilute tainted well water is a concrete and continuing damages component. The purchase agreements and billing records document this cost and any ongoing supply arrangements. These are active contract and billing records that should be preserved through the litigation.
The Money: What This Case Is Worth
The economic stakes in this case are substantial and well-documented. The water district’s cost-recovery action alone involves documented expenses that provide a clear floor for the case value.
The Water District’s Cost-Recovery Damages
The documented economic damages include:
- $80 million for the treatment plant — nearly complete as of the filing
- Tens of millions in prior remediation spending since 2018
- $2.75 million in a single year (2022) for Denver Water dilution supply
- Ongoing accelerated filter replacement costs — PFAS-laden water degrades treatment filters faster than normal, requiring more frequent replacement at significant expense
- Future operational and maintenance expenses for the treatment facility — because the contamination is alleged as ongoing, these costs will continue to accrue indefinitely
The district’s manager, Abel Moreno, said there remains “a huge deficit” between the cost of treatment and the state and federal funds the district scraped together. The district funded the plant with $60 million in federal law money and $17 million in borrowing — but that does not cover the prior years of remediation spending, the ongoing operational costs, or the future expenses of running the treatment facility in perpetuity. District residents are paying higher water rates because of the cost of avoiding PFAS, Moreno said.
The total cost-recovery value — past, present, and future expenses combined — plausibly ranges from $80 million on the low end (the treatment plant alone) to $200 million or more on the high end (including all prior remediation, ongoing operational costs, filter replacement, dilution purchases, and future operational expenses for the foreseeable future).
Individual Toxic Tort Damages
For individual residents, the damages picture is different but no less significant. Individual PFAS toxic tort claims can include:
Medical monitoring costs. The 75,000 affected residents face increased risk of PFAS-associated conditions. Medical monitoring — the cost of regular screening to detect these conditions early when they are most treatable — is a recognized category of damages in toxic tort cases. The conditions to monitor include kidney cancer, testicular cancer, thyroid disease, pregnancy-induced hypertension, and reduced vaccine response. A medical monitoring program for a population of this size, sustained over years, is a substantial economic damage category.
Personal injury damages. Residents who have developed PFAS-attributable diseases may pursue compensation for medical expenses, lost wages, lost earning capacity, pain and suffering, and other personal injury damages. The value of these claims depends on the specific condition, its severity, the treatment required, and the impact on the individual’s life.
Property value diminution. Homes served by a water district with documented PFAS contamination may experience property value impacts. This is a measurable economic damage that can be quantified through appraisal and market analysis.
Punitive damages. If discovery reveals that Denver knew or should have known of the PFAS hazard and failed to implement available containment or remediation measures, Colorado law may allow punitive damages. The decades-long duration of the alleged contamination and the vast gap between facility well levels (up to 20,000 ppt) and EPA standards (4.0 ppt) could support a reckless indifference theory. Punitive damages are never guaranteed, but the factual pattern — decades of contamination, levels thousands of times above safety standards, and a facility that continued operating — creates a factual basis for the argument.
The CGIA’s Potential Limitations on Individual Recovery
For individual claims against the City and County of Denver specifically, the Colorado Governmental Immunity Act may limit the damages recoverable. The CGIA can impose damage caps on claims against public entities. However, the CGIA’s limitations may not apply to all defendants in a PFAS case — claims against AFFF manufacturers, for example, are not claims against a government entity and would not be subject to the CGIA’s restrictions. This is another reason why naming the full universe of defendants — not just Denver — is strategically important for individual plaintiffs.
The deep-pocket defendants in this case — a major municipal government and global chemical manufacturers — support the collectibility of any judgment. But the CGIA’s constraints on claims against the municipal defendant mean that the manufacturer defendants may be the more accessible source of full individual recovery.
The Medicine: What PFAS Does to the Human Body
Understanding the health risks of PFAS exposure is not just important for your medical decisions — it is the foundation of any individual toxic tort claim. The science connecting PFAS to human disease is more developed than for many environmental contaminants, and it continues to strengthen.
How PFAS Enters and Persists in the Body
PFAS are persistent, bioaccumulative chemicals. They bind to serum proteins and concentrate in the liver and kidney. They are not metabolized — the human body cannot break them down. They have long half-lives in the human body, measured in years. Some PFAS compounds have estimated half-lives of two to seven years in human blood. That means if you were exposed to PFAS in drinking water for a decade, the chemicals accumulated in your body over that entire period, and they will remain in your blood for years after the exposure stops.
The primary route of exposure in this case is ingestion — drinking contaminated water. PFAS in drinking water enters the gastrointestinal tract, is absorbed into the bloodstream, and distributes throughout the body. The concentration in your blood reflects your cumulative exposure over time.
The C8 Science Panel Probable Links
The most authoritative body of evidence on PFAS health effects comes from the C8 Science Panel — a group of independent epidemiologists who studied the health effects of PFOA (one of the two PFAS compounds at issue here) as part of a class-action settlement in the Mid-Ohio Valley. The panel found a “probable link” between PFOA and six conditions:
- Kidney cancer
- Testicular cancer
- High cholesterol
- Thyroid disease
- Pregnancy-induced hypertension
- Ulcerative colitis
The “probable link” finding is a specific legal-scientific standard that means the evidence supports a conclusion that exposure is more likely than not related to the disease. While more recent scientific reviews have characterized some of the cancer evidence as “supportive but not definitive,” the C8 findings remain the most widely cited and legally significant body of PFAS health-effects research.
IARC Carcinogen Classifications
The International Agency for Research on Cancer — the world’s leading cancer-science authority — has classified PFOA as Group 1, carcinogenic to humans. PFOS has been classified as Group 2B, possibly carcinogenic to humans. The IARC Group 1 classification means that the scientific evidence supports a conclusion that PFOA causes cancer in people. This is not a speculation — it is the conclusion of the world’s top cancer research body, based on a systematic review of human, animal, and mechanistic evidence.
How the Disease Develops: Mechanism and Latency
PFAS are believed to cause harm through several mechanisms, including endocrine disruption, oxidative stress, and immune system modulation. For the cancer-associated conditions, the proposed pathways involve genotoxic damage and alterations in cellular processes that promote malignant transformation.
The latency period — the time between exposure and disease development — is variable and can be long. For kidney cancer and testicular cancer, the disease may not appear for years or decades after the exposure that contributed to it. This latency is both a medical reality and a legal challenge: it means that some residents who were exposed may not yet know they are sick, and it means the discovery rule for statutes of limitations is critically important.
What Conditions to Watch For
If you lived in the South Adams County Water and Sanitation District and may have been exposed to PFAS in your drinking water, the conditions associated with PFAS exposure that warrant medical attention include:
- Kidney cancer — symptoms can include blood in the urine, persistent back or side pain, fatigue, and unexplained weight loss
- Testicular cancer — typically presents as a lump or swelling in a testicle
- Thyroid disease — symptoms can include unexplained weight changes, fatigue, temperature sensitivity, and changes in heart rate
- Pregnancy-induced hypertension — high blood pressure during pregnancy, which can pose risks to both mother and baby
- High cholesterol — elevated cholesterol levels that may not respond to typical dietary interventions
- Ulcerative colitis — chronic inflammation of the digestive tract, causing abdominal pain and diarrhea
- Reduced vaccine response — PFAS exposure may reduce the effectiveness of certain vaccines, which is particularly concerning for children
If you have been diagnosed with any of these conditions and you lived in the affected area, document your diagnosis and your residency history. These records are the foundation of an individual toxic tort claim.
The Proof Problem the Defense Exploits
PFAS is ubiquitous — it is in nearly everyone’s blood to some degree, because it has been used in countless consumer products as stain resistance, waterproofing, food packaging, and more. The defense in any individual PFAS case will argue that the plaintiff cannot attribute their disease to the water district’s contamination specifically, as opposed to background exposure from consumer products, occupational sources, or other environmental contamination.
The counter to this argument is dose reconstruction: establishing that the plaintiff’s exposure from drinking contaminated water was elevated — higher than background — through water-utility testing records, residence history, and the documented contamination levels in the district’s wells. The C8 Science Panel’s dose-response findings, which show that higher exposure levels correlate with higher disease risk, support the argument that the elevated exposure from the water district’s contamination was a substantial contributing factor to the disease.
This is why the historical well water sampling data — the evidence we discussed in the evidence-clock section — is so critical to individual claims, not just to the water district’s cost-recovery action. The sampling data establishes the dose. The dose establishes the risk. The risk, combined with a diagnosis, establishes the causal link.
The Defense Playbook: What to Expect
If you are considering an individual PFAS claim, you need to understand the defense strategies that will be deployed against you. Not because they are insurmountable — they are not — but because recognizing them when they arrive is the first step to defeating them.
Play 1: “The contamination came from somewhere else”
The defense will argue that the PFAS in the water came from sources other than the Roslyn facility — the former Stapleton airport, the Suncor refinery, consumer products, or other industrial activity along the I-270 and US-85 corridors. The counter is hydrogeological modeling that traces the contaminant plume from the Roslyn facility through the alluvial aquifer to the district’s wells, combined with the documented concentration gradient — the highest levels are at the source, decreasing with distance, which is the signature of a point-source contamination plume.
Play 2: “We were following federal regulations — the FAA made us use this foam”
The defense will argue that the FAA and DOD historically mandated or approved the use of AFFF containing PFAS at airports and military installations, and that Denver was simply complying with federal requirements. The counter is twofold. First, under CERCLA’s strict-liability framework, regulatory compliance is not a defense. Second, even if AFFF use was initially required, the duty to contain, monitor, and remediate the runoff was always Denver’s — and the growing scientific awareness of PFAS hazards over the years meant that Denver should have taken proactive steps to manage the risk long before the contamination was discovered in 2018.
Play 3: “Your disease came from something else — diet, genetics, lifestyle”
The defense will argue that the plaintiff’s kidney cancer, thyroid disease, or other condition was caused by factors unrelated to PFAS exposure — family history, diet, occupational exposure, smoking, or other lifestyle factors. The counter is the medical literature: IARC’s Group 1 classification of PFOA, the C8 Science Panel’s probable-link findings, the documented elevated exposure from the water district’s contamination, and the dose-response relationship established in the scientific literature. The defense will try to isolate each potential cause; the plaintiff’s case ties them together through the exposure record and the medical science.
Play 4: “You waited too long to sue”
The defense will argue that the statute of limitations has expired. The counter is the discovery rule: for latent diseases that take years or decades to develop, the clock does not start until the plaintiff knew or should have known of the injury and its connection to PFAS exposure. A resident diagnosed with kidney cancer in 2026 who is only now learning that their water was contaminated may be well within the limitations period — but this is a legal determination that requires prompt evaluation by an attorney familiar with Colorado’s toxic tort landscape and the CGIA’s notice requirements.
Play 5: “The water district’s lawsuit handles this — you don’t have your own claim”
This is not exactly a defense play, but it is a misconception that can cost residents their rights. The water district’s cost-recovery action does not compensate individual residents for their personal injuries, medical monitoring needs, or property damage. The district is recovering its infrastructure and operational costs. Your individual claim is separate, runs on its own clock, and requires its own legal action. Waiting for the district’s lawsuit to “handle everything” is one of the most dangerous things a resident can do — because while the district’s case may take years, your individual statute of limitations and CGIA notice window are running in parallel.
The Proof Story: How a PFAS Case Is Built
A PFAS contamination case — whether it is the water district’s cost-recovery action or an individual resident’s toxic tort claim — is built through a chronological process that begins with evidence preservation and ends with a damages model. Here is how that process works, from the perspective of a trial team that has handled toxic exposure cases.
Week One: Preservation
The first move is a litigation hold and spoliation letter — sent to every entity that may hold relevant evidence, ordering them to preserve all records, communications, sampling data, procurement documents, and physical samples. This letter is what stops the evidence from disappearing. It converts routine retention cycling into sanctionable destruction. If a defendant lets required evidence die after receiving a preservation letter, the court can impose an adverse-inference instruction — telling the jury to assume the lost evidence was as bad for the defendant as the plaintiff says it was.
The preservation letter goes out to the City and County of Denver, to any AFFF manufacturers named as potential defendants, and to any third-party data vendors or testing laboratories that hold relevant records. It names, specifically, the records to be preserved: historical well water sampling data, AFFF procurement and usage records, hydrogeological studies, internal communications regarding PFAS awareness, regulatory correspondence, treatment plant cost records, and Denver Water dilution purchase agreements.
Discovery: The Document Hunt
Once the case is filed, the discovery process begins. Discovery in a PFAS case is document-intensive. The targets include:
- Denver’s internal timeline of PFAS awareness — when city officials first learned that AFFF runoff from the Roslyn facility was contaminating regional groundwater, what containment measures were considered or implemented, and whether any internal warnings were ignored or suppressed.
- AFFF procurement records spanning decades — to establish the volume and duration of foam use, directly linking Denver’s activities to the contamination source.
- Hydrogeological modeling — to map the contaminant plume from the facility through the alluvial aquifer to South Adams County wells, establishing the causal link between source and injury.
- The manufacturer’s own internal research and testing — what the chemical companies knew about PFAS health and environmental risks, and when they knew it. The TSCA Section 8(a)(7) PFAS reporting rule requires manufacturers to report uses, production volumes, disposal, exposures, and known hazards going back to 2011 — a potential treasure trove of internal corporate knowledge.
Expert Witnesses: The Scientific Spine
A PFAS case requires a team of expert witnesses, each owning a specific piece of the scientific narrative:
- A hydrogeologist — to perform plume migration analysis, modeling how PFAS traveled from the Roslyn facility through the alluvial aquifer to the district’s wells, and establishing the transport timeline.
- An environmental engineer — to validate the remediation costs and project future operational expenses, providing the economic damages foundation.
- A PFAS toxicologist — to assess the health risk to the exposed population, establishing the connection between the documented exposure levels and the increased disease risk.
- A forensic economist — to model the lifetime treatment costs, medical monitoring expenses, and economic impact on the affected population.
- Medical monitoring experts and epidemiologists — for any individual toxic tort component, to establish the increased disease risk for the 75,000 exposed residents and the medical monitoring protocols appropriate for early detection.
Depositions: The Human Story
The documentary evidence tells what happened. The depositions tell why. The key depositions in a PFAS case target the people who made the decisions — the fire training facility operators who used the foam, the procurement officials who purchased it, the environmental compliance staff who were responsible for monitoring runoff, and the decision-makers who chose whether to implement containment measures. Under oath, these witnesses explain the company’s choices — and the gap between what they knew and what they did is often the most powerful evidence in the case.
Building the Number
The damages model in a PFAS case is not a single number pulled from a formula. It is built from multiple streams: the documented past costs, the projected future costs, the medical monitoring program design, the individual injury claims, and where applicable, the punitive damages argument. A life-care planner builds the cost stream for individual medical needs. A forensic economist reduces it to present value. The defense’s first settlement offer is typically a fraction of the fully developed number — which is why building the number completely, with every cost category documented and every projection grounded in expert analysis, is the key to maximizing recovery.
Your First Steps: A Practical Roadmap
If you are a resident of the South Adams County Water and Sanitation District — or if you lived there at any point during the years the contamination was occurring — here are the concrete steps you should consider taking. This is not legal advice for your specific situation; it is general information about what people in your position typically do. For advice about your individual circumstances, you need a consultation with a lawyer who can evaluate your specific facts.
Step 1: Document Your Exposure Window
Write down where you lived, when you lived there, and whether you received your water from the South Adams County Water and Sanitation District. If you have old water bills, residency records, lease agreements, or other documents establishing your address and dates of residence in the district, gather and preserve them. Your exposure window — the period during which you were drinking potentially contaminated water — is one of the most important facts in any individual claim.
Step 2: Document Any Diagnoses
If you or a family member has been diagnosed with kidney cancer, testicular cancer, thyroid disease, pregnancy-induced hypertension, high cholesterol, ulcerative colitis, or any other condition associated with PFAS exposure, document the diagnosis. Obtain copies of your medical records, including the diagnosis date, the treating physician’s notes, and any treatment history. The date of diagnosis is critical for the statute of limitations analysis — it may be the date the discovery-rule clock started running.
Step 3: Preserve Historical Water Bills and Residency Records
Historical water bills and residency records establish that you received water from the affected district during the contamination period. These documents are the bridge between the documented contamination and your individual exposure. If you have moved, try to locate old utility records, lease agreements, or other proof of residency. These records can be difficult to reconstruct years later.
Step 4: Get a Legal Evaluation Promptly
The single most important step is to get a legal evaluation of your individual situation as soon as possible. The reasons for urgency are specific and real:
- The CGIA notice window — if your claim involves the City and County of Denver, the Colorado Governmental Immunity Act may require notice within a statutory period that can be as short as 90 days from the date you discovered your injury. Missing this window can extinguish your claim entirely.
- The statute of limitations — Colorado’s personal injury statute of limitations generally runs about two years from the date of discovery, but the discovery rule for latent diseases has specific legal parameters that require prompt evaluation.
- Evidence preservation — the records that would prove your case are on retention schedules. The earlier a lawyer sends a preservation letter, the more evidence survives.
- Medical monitoring — if you have not yet been diagnosed with a PFAS-associated condition but face elevated risk, a medical monitoring claim may be available. This claim has its own legal requirements and timeline.
When you call Attorney911, the consultation is free and confidential. We do not get paid unless we win your case. The first conversation is about understanding your situation — your exposure window, your diagnoses, your residency history — and giving you an honest assessment of whether and how the law can help you.
Step 5: Do Not Sign Anything from an Insurance Adjuster
If anyone contacts you representing the City and County of Denver, an AFFF manufacturer, or any insurance company associated with the contamination, do not sign anything. Do not give a recorded statement. Do not accept a “quick settlement” check. The friendly voice on the phone asking you to “just tell us what happened” is building a record designed to minimize your claim. A recorded statement can be quoted against you. A release can extinguish your rights entirely. Before you sign, before you talk, before you accept anything — get a lawyer to review it.
Step 6: Talk to Your Doctor
If you have not already, talk to your doctor about your PFAS exposure history. Let them know you lived in an area with documented PFAS water contamination. Ask about appropriate screening for the conditions associated with PFAS exposure. Your medical record should reflect your exposure history — not just your symptoms — because the connection between exposure and disease is the foundation of any individual claim.
Frequently Asked Questions
Is my water safe to drink now?
The South Adams County Water and Sanitation District has taken aggressive corrective action. The district has shut off contaminated wells, is nearly complete with an $80 million treatment facility designed to filter out PFAS, and has been purchasing dilution water from Denver Water. The district’s manager has stated that the district protects public health by providing clean and reliable drinking water. The treatment facility should be operating by the end of the year. However, the exposure that already occurred — the years or decades of drinking water that exceeded the EPA’s safety limits — cannot be undone. Your current water is being treated. Your past exposure is what an individual legal claim addresses.
How long was the water contaminated?
The lawsuit alleges the contamination lasted decades and is ongoing. The district discovered the contamination in 2018, but the AFFF foam that caused it was used at the Roslyn Fire Training Facility for years before that. The exact duration of the contamination is one of the questions the lawsuit’s discovery process will answer — through historical sampling data, AFFF procurement records, and hydrogeological modeling. If you lived in the district at any point before 2018, you may have been exposed.
What health conditions are linked to PFAS exposure?
The C8 Science Panel found a “probable link” between PFOA and six conditions: kidney cancer, testicular cancer, high cholesterol, thyroid disease, pregnancy-induced hypertension, and ulcerative colitis. The International Agency for Research on Cancer has classified PFOA as a Group 1 carcinogen (carcinogenic to humans) and PFOS as a Group 2B carcinogen (possibly carcinogenic). PFAS exposure has also been associated with reduced vaccine response, which is particularly concerning for children. If you have been diagnosed with any of these conditions and lived in the affected area, document your diagnosis and seek a legal evaluation.
Do I have a separate legal claim from the water district’s lawsuit?
Yes. The water district’s lawsuit is a cost-recovery action that seeks to make Denver pay for the infrastructure and operational costs of cleaning PFAS out of the water supply. It does not compensate individual residents for personal injuries, medical monitoring, or property damage. Your individual claim — if you have a PFAS-associated condition or want medical monitoring — is a separate legal action that runs on its own statute-of-limitations clock and may name different defendants. The water district’s lawsuit does not “handle” your individual rights. Waiting for it to resolve could cost you your own claim.
How long do I have to file a claim?
Colorado’s statute of limitations for personal injury actions generally runs about two years from the date the injury is discovered. For latent PFAS-related diseases, the discovery rule may delay the start of the clock until you knew or should have known that your condition was connected to PFAS exposure. However, if your claim involves the City and County of Denver, the Colorado Governmental Immunity Act may require notice within a statutory period that can be as short as 90 days. These deadlines are not flexible. The only safe approach is to get a legal evaluation promptly — do not assume you have “plenty of time” based on a general rule you read online.
Who can be held responsible for the contamination?
The lawsuit names the City and County of Denver, which owns and operates the Roslyn Fire Training Facility. But the universe of potentially responsible parties is broader. The companies that manufactured the AFFF foam — including entities like DuPont, 3M, and their corporate successors — face products liability claims for designing, manufacturing, and selling products containing PFAS without adequate warnings. The Colorado Attorney General has already sued these manufacturers. Any entity that conducted AFFF training at the former Stapleton airport site may also share liability. A thorough investigation identifies every responsible party, because each is a separate source of potential recovery.
What is medical monitoring and can I get it?
Medical monitoring is a recognized category of damages in toxic tort cases. It is the cost of regular medical screening designed to detect PFAS-associated conditions early — when they are most treatable. If you lived in the affected area and face elevated risk of PFAS-associated disease, you may be entitled to a medical monitoring program that includes regular screening for kidney cancer, testicular cancer, thyroid disease, and other associated conditions. Medical monitoring is not the same as compensation for a disease you already have — it is a separate claim for the cost of catching disease early. Whether you qualify depends on your exposure history and the specific legal requirements of your jurisdiction.
Should I get my blood tested for PFAS?
PFAS blood testing — biomonitoring — can measure the concentration of PFAS in your serum. Elevated levels can confirm that your exposure was higher than background, which is useful evidence in an individual claim. However, blood testing is a medical decision that should be made in consultation with your doctor. A blood test showing elevated PFAS does not by itself mean you will develop a disease — it means you were exposed. And a blood test showing lower-than-expected levels does not mean you were not exposed — it depends on when the test is taken relative to your exposure period and the half-life of the specific PFAS compounds involved. Talk to your doctor about whether blood testing is appropriate for your situation.
Can I join a class action?
PFAS cases can proceed as individual claims, as mass tort actions, or in some cases as class actions. The AFFF litigation — which includes claims by water providers, individuals, and other plaintiffs — has been consolidated into a multidistrict litigation (MDL) in the federal court system. Whether your individual claim should be filed independently, joined to an existing MDL, or pursued through another procedural mechanism is a strategic decision that depends on your specific facts and goals. A lawyer who handles toxic tort cases can advise you on the best procedural path for your situation.
What will it cost me to talk to a lawyer?
Nothing. The consultation is free. We work on contingency — we do not get paid unless we win your case. That means there is no upfront cost, no hourly billing, and no fee unless we recover compensation for you. If we are not the right fit for your case, we will tell you. The first conversation is about understanding your situation and giving you an honest assessment — not about selling you on filing a lawsuit.
Why Our Firm
We are Attorney911 — The Manginello Law Firm, PLLC. We are a trial firm that takes Colorado cases. We handle toxic-exposure, catastrophic-injury, and wrongful-death cases, and we bring the same intensity to a family drinking contaminated water as we do to any other case where a corporation or government entity put its own interests ahead of people’s safety.
Ralph Manginello has spent 27+ years in courtrooms, including federal court. He was a journalist before he was a lawyer — which means he knows how to find the story the documents tell, and he knows how to tell that story to a jury. Ralph does not settle for the first number an adjuster offers. He builds the case the way it should be built — evidence first, science second, and the human cost third, because that is the order a jury needs to hear it.
Lupe Peña is a former insurance-defense attorney. He spent years inside a national defense firm — the rooms where adjusters and their software decided how to deny, delay, and devalue claims from people exactly like the residents of South Adams County. He knows how the other side values a claim, how they set reserves in the first 48 hours, how they pick their IME doctors, and how they engineer recorded statements to be quoted against you. Now he uses that knowledge for injured clients. Lupe is fluent in Spanish and conducts full consultations in Spanish without an interpreter — and we say that with pride, because the community along the I-270 and US-85 corridors includes many families who deserve to understand their rights in the language they actually think in.
We are based in Houston, Texas, and we take Colorado cases — working with local counsel and pro hac vice admission where required. We do not claim an office in Colorado. We do not invent a Colorado bar admission. What we bring is the trial experience, the toxic-exposure knowledge, the insurance-defense insider’s understanding, and the resources to take on a municipal government and global chemical manufacturers. We handle cases on contingency — 33.33% before trial, 40% if the case goes to trial. We do not get paid unless we win your case. The consultation is free.
If you or a family member lived in the South Adams County Water and Sanitation District and you want to understand your individual legal rights — separate from the water district’s cost-recovery lawsuit — call us. The call is free. The conversation is confidential. And the clock on your individual claim may be running.
Past results depend on the facts of each case and do not guarantee future outcomes.
Call 1-888-ATTY-911 (1-888-288-9911). Free consultation. No fee unless we win. Contact us. Hablamos Español.
We are Legal Emergency Lawyers™ — and the families of Commerce City and South Adams County deserve nothing less.