In March 2026, the Hartford Business Journal reported that Connecticut's largest water utilities face hundreds of millions of dollars in costs to filter PFAS, the per- and polyfluoroalkyl substances now turning up in drinking water. The EPA's new PFAS regulations set the first federal limits for these chemicals. Aquarion Water Company, which serves most of Fairfield County, put a number on it: roughly $150 million for its cleanup program.
The number is striking. The timeline is worse. Those new PFAS maximum contaminant levels, the first federal drinking water limits ever set for these chemicals, carry a compliance deadline of 2029 (EPA has proposed a requestable extension to 2031). Utilities have until then to get their PFAS below the new limits.
The federal deadline is April 2029. In May 2026 the EPA proposed letting systems request an exemption pushing their own date to April 2031; that proposal is not final, and public comment closes July 20, 2026. Either way it is years of water that may contain PFAS above the level the EPA's own health goal calls unsafe, which is zero.
What Does PFAS Actually Do to Your Body?
PFAS is a family of about 12,000 synthetic chemicals, used since the 1940s in nonstick cookware, waterproof clothing, food packaging, firefighting foam, and hundreds of industrial products. They're called "forever chemicals" because they don't break down, not in the environment and not in your body.
The health effects documented by the ATSDR's toxicological profile for PFAS include increased risk of kidney cancer, testicular cancer, thyroid disease, high cholesterol, immune system disruption, and reproductive problems. The EPA set its new limits specifically because the science on these effects has become impossible to ignore.
Here's the connection that almost nobody is making: thyroid disease is one of the most common diagnoses in Fairfield County. The thyroid is one of the organs most sensitive to PFAS disruption. PFAS interfere with thyroid hormone production and regulation. Fairfield County has some of the most PFAS-contaminated groundwater in Connecticut. These facts exist in separate conversations. They shouldn't.
Where the Contamination Comes From
Fairfield County's PFAS problem has multiple sources, and they compound each other.
Aquarion leans heavily on groundwater, drawing from aquifers that have been soaking up PFAS for decades from several directions at once. Military bases used PFAS-containing firefighting foam (AFFF) for years. So did airports. Paper mills, electroplating plants, and textile manufacturers used PFAS in their processes. All of it eventually reaches the groundwater.
In October 2025, a lawsuit was filed against Kimberly-Clark over PFAS contamination from their New Milford facility. Testing in April 2024 found high levels of PFOS and PFOA, two of the most dangerous PFAS compounds, in a private well near the plant. New Milford sits in Litchfield County, on the edge of Aquarion's territory. Groundwater doesn't respect county lines.
Connecticut's Attorney General William Tong filed suit in January 2024 against 28 chemical manufacturers for knowingly contaminating Connecticut's waters. The legal theory is sound. The timeline for resolution is not: these cases will take years, possibly a decade, to resolve.
Why the Compliance Timeline Leaves You a Gap
The EPA's deadline gives utilities time to build treatment plants, which is fair enough. You cannot build a $150 million system overnight. But it leaves a gap. The science says these chemicals are harmful at very low concentrations. The EPA wrote limits to match that science. And utilities get five years.
In the meantime, the water utilities are not violating the law. They're operating within the compliance timeline. They're also delivering water that contains PFAS.
In the EPA's most recent national monitoring round (UCMR5, samples collected January 2023 to December 2025), 35 Connecticut public water systems had at least one PFOA or PFOS result above the 4 ng/L limit, and Aquarion's systems are among them. Two things must be said plainly about that number. It is a count of systems, not towns, and Aquarion alone serves many towns. And it is not a count of violations: the EPA judges compliance on a running annual average, not on a single reading, so a system above 4 ng/L in one sample is not thereby breaking the law.
What Fairfield County Homeowners Can Do Today
The gap between "utilities are working on it" and "your water is safe" is where home filtration lives.
Reverse osmosis is the most effective home technology for removing PFAS. A point-of-use unit, usually installed under the kitchen sink, removes more than 90% of PFAS compounds. The unit runs $300-$800, plus installation.
Whole-house reverse osmosis costs more ($1,500-$4,000 installed) but covers every tap, including the shower. Skin can absorb some PFAS, though drinking it is the main route in.
Activated carbon filters, the kind in pitchers and faucet attachments, remove some PFAS but not all, and how well they work varies a lot by compound. The EWG's Tap Water Database can show you which PFAS compounds have been detected in your area. In Fairfield County, where the contamination is documented, reverse osmosis is the more reliable choice.
Aquarion's $150 million will eventually fix this at the utility level. Until it is built, filtration is the fix you control.
Want ZIP-level context before deciding whether to test? Enter your ZIP code at CheckYourTap.com to see available public-system or regional monitoring records associated with the ZIP. This is not a test of a tap, well, or property. Free, in 30 seconds.
Keep Reading
- Your Connecticut Water Bill Is Going Up Because of PFAS. Here's What You're Actually Paying For.
- The Connection Between Your Water, Your Thyroid, and Your Hair That Nobody Is Making
- The Navy Has Been Poisoning the Water in Groton for Decades. The People Who Live There Are Just Finding Out.
Sources: Hartford Business Journal, "CT water utilities face hundreds of millions in PFAS compliance costs," March 9, 2026; CT DEP 2024 Annual Report on Drinking Water; CT AG William Tong press release, January 25, 2024; Silver Golub & Teitell lawsuit against Kimberly-Clark, October 2025; EPA PFAS National Primary Drinking Water Regulation, 2024.
