If you drink tap water in the United States, there is a reasonable chance it contains PFAS—per- and polyfluoroalkyl substances, a family of roughly 12,000 synthetic chemicals that do not break down in the environment or the human body. The EPA calls them “forever chemicals” because that is precisely what they are.
In April 2024, the EPA finalized the first national Maximum Contaminant Level (MCL) for six PFAS compounds in public drinking water. The rule set enforceable limits: 4 parts per trillion for PFOA and PFOS individually—the two most studied PFAS compounds—and a hazard index standard for a mixture of four additional compounds including PFNA, PFHxS, HFPO-DA (a compound known as GenX), and PFBS. Water systems were given five years to comply: by April 2029.
That sounds orderly. It is not.
What the EPA Found
The EPA's own testing data, compiled through the Fifth Unregulated Contaminant Monitoring Rule (UCMR 5), found PFAS at detectable levels in approximately 45 percent of U.S. tap water samples. That is not 45 percent of systems in areas with known contamination. That is 45 percent of a nationally representative sampling—urban, rural, well water, municipal systems—conducted between 2023 and 2024.
More than 70 million Americans are served by water systems that the EPA estimates will need to take action to come into compliance. The agency projects that the MCL rule will prevent thousands of deaths and tens of thousands of serious illnesses annually once fully implemented—including reduced incidence of kidney cancer, testicular cancer, thyroid disease, immune system disruption, and developmental harm in children and infants.
“The science is unambiguous: PFAS at low concentrations cause serious harm over time. These are not theoretical risks. They are documented outcomes in exposed communities.” — EPA Administrator statement, April 2024 rule finalization
The Utility Industry Fought the Rule—and Is Still Fighting
The American Chemistry Council and several water utility trade groups challenged the EPA's MCL for PFAS in federal court within months of the rule's finalization. The core argument: the EPA set limits too low, the science is uncertain, and the compliance cost—estimated by the agency at $1.5 billion annually across all systems—is prohibitive for smaller utilities.
That $1.5 billion figure is worth examining. The same chemical manufacturers whose products contaminated these water systems have collectively earned hundreds of billions of dollars in revenue from PFAS-containing products over the past seven decades. 3M, which manufactured PFOS for decades and sold it to the U.S. military for use in firefighting foam, agreed to a $10.3 billion settlement with public water systems in 2023—but admitted no wrongdoing. DuPont and its spinoffs agreed to a $1.185 billion settlement covering PFOA contamination. The money flows to utilities. It has not, in most cases, flowed to the individuals who drank the water.
Who Isn’t Being Told
Federal law requires water utilities to notify customers when a contaminant exceeds an MCL. But here is the gap: a contaminant must be regulated—with an enforceable MCL in effect—before that notification obligation triggers. The PFAS MCL rule doesn’t become enforceable until April 2029. In the meantime, utilities that detect PFAS above the new limits are not legally required to tell you.
Some do. Many don't.
RFA Investigations reviewed water quality reports from thirty municipal systems across California, Ohio, Michigan, and North Carolina that have previously disclosed PFAS detections above the new EPA limits in their UCMR 5 monitoring data. Of those thirty, eleven did not include any PFAS disclosure in their most recent Consumer Confidence Report—the annual water quality summary utilities are required to mail to customers each July. Nine disclosed PFAS detections but did not compare those levels to the new MCL or inform customers whether their water would require treatment under the coming rule.
Only ten systems proactively disclosed both the detection levels and the compliance timeline.
The Communities Already Harmed
PFAS contamination is not evenly distributed. It is concentrated around military bases that used aqueous film-forming foam (AFFF) for firefighting—a product that contained PFOS and PFOA at extraordinarily high concentrations. It clusters near manufacturing sites, airports, industrial laundries, and landfills. It disproportionately affects communities of color and low-income communities that lack the political power to compel early remediation.
In Parchment, Michigan, a small city near Kalamazoo, PFAS contamination from a paper mill shut down the municipal water system in 2018. Residents were told to stop drinking the water after PFOA and PFOS were detected at more than 1,000 parts per trillion—250 times the new EPA limit. A class action lawsuit is ongoing. Bottled water distribution lasted months. Eight years later, residents are still waiting for long-term remediation to be completed.
In Wilmington, North Carolina, the Cape Fear River—the primary drinking water source for more than 300,000 people—has been contaminated with GenX, a PFAS compound developed as a replacement for PFOA after the original compound was phased out. Chemours, a DuPont spinoff, had been discharging GenX into the river for years. The company disclosed the contamination only after an academic researcher identified it in the water in 2017.
“We were told the water was safe. Then we were told it wasn’t. Then we were told a different chemical was in it. There is a trust problem here that a compliance deadline doesn’t fix.”
What the Five-Year Window Actually Means
The EPA's five-year compliance timeline is designed to give utilities time to build treatment infrastructure—primarily granular activated carbon filters or reverse osmosis systems, both of which are effective at removing PFAS. But five years is not a firm deadline for notification. It is a deadline for treatment.
Between now and April 2029, millions of Americans will continue drinking water that exceeds the new federal limits, with no legal requirement that their utility tell them so in plain language on their water bill. The Consumer Confidence Report process—an annual document that most customers never read, mailed in the summer to addresses that may have changed—is the primary notification mechanism. It is not adequate.
Advocates at the Environmental Working Group, which has maintained the most comprehensive public database of PFAS detections in U.S. water systems, have called for real-time digital notification and direct communication to customers whose systems detect PFAS above the new MCL—regardless of whether the enforcement deadline has arrived.
What You Can Do Right Now
The Environmental Working Group maintains a searchable PFAS tap water database at ewg.org. Enter your zip code to see whether PFAS has been detected in your water system and at what levels. This database draws on UCMR 5 and state testing data and is updated regularly.
If your system shows PFAS detections above 4 ppt for PFOA or PFOS, contact your water utility directly and ask: What is your compliance plan under the EPA's April 2024 MCL rule? What treatment technology will you install? What is your timeline? Put it in writing. If you rent, your landlord has no obligation to filter tap water—that responsibility is yours to take or leave.
Point-of-use reverse osmosis filters, certified to NSF/ANSI Standard 58, are the most effective residential option for removing PFAS. Pitcher filters using activated carbon reduce PFAS levels but typically do not eliminate them entirely.
If you believe your water has harmed your health, contact an environmental attorney. The statute of limitations varies by state, and litigation related to PFAS water contamination is ongoing across the country.
Methodology: RFA reviewed Consumer Confidence Reports from thirty water systems across four states. PFAS detection data sourced from EPA UCMR 5 monitoring results, public records. This investigation is ongoing. Tips: tips@radiofreeamerica.press