New Haven's drinking water – supplied by the Regional Water Authority – is a surface-water system that meets most federal and Connecticut state standards, but EPA UCMR5 testing found PFOA and PFOS above the EPA's 2024 limit of 4 parts per trillion at the RWA's monitored entry point. That means the utility has treatment work to do before the federal compliance deadline. Here's what the actual data shows, and what New Haven residents can do right now.
The Regional Water Authority (RWA) serves New Haven and more than 20 surrounding towns across South Central Connecticut. The system draws from a network of surface reservoirs, primarily Lake Saltonstall (on the Branford-East Haven border), Lake Gaillard in North Branford, and Lake Whitney in Hamden. These are surface water sources, which means they're filtered and treated before reaching your tap – but they're also more exposed to runoff from surrounding land than deep aquifer sources.
Connecticut has long treated water quality seriously. The state Department of Public Health enforces standards that match federal EPA rules, and RWA publishes an annual Consumer Confidence Report (CCR) that details what was found in the water that year.
PFAS – per- and polyfluoroalkyl substances, often called forever chemicals – are synthetic compounds used in nonstick cookware, firefighting foam, food packaging, and hundreds of industrial applications since the 1940s. They accumulate in the environment because they don't break down. The EPA's UCMR5 program (Unregulated Contaminant Monitoring Rule, 5th round) required utilities across the US to test for PFAS compounds between 2023 and 2025, providing the most comprehensive national picture of PFAS in tap water to date.
RWA participated in UCMR5 testing. The program measured 29 individual PFAS compounds. For context: the EPA's April 2024 rule set enforceable limits (Maximum Contaminant Levels, or MCLs) of 4 parts per trillion (ppt) for PFOA and PFOS individually, 10 ppt for PFNA, PFHxS, and HFPO-DA, and a hazard index calculation for mixtures of those last three compounds plus PFBS. In May 2026, the EPA proposed rescinding all but the PFOA and PFOS limits and letting systems extend compliance from 2029 to 2031.
In KYE's copy of the EPA UCMR5 data, RWA's monitored entry point showed PFOA detections averaging about 5.7 ppt (ranging to 7.1 ppt) and PFOS averaging about 5.7 ppt (ranging to 10.7 ppt). Both compounds sit above the EPA's 4 ppt maximum contaminant level, so the system will need additional treatment to come into compliance by the federal deadline. The EPA also notes there is no known completely safe level of PFAS exposure; the 4 ppt limit reflects what current treatment technology can reasonably achieve, not a biological threshold.
To check the specific PFAS levels reported for your New Haven zip code, use the KnowYourExposure lookup tool – it pulls directly from EPA UCMR5 data and shows you exactly what was detected in your water system.
Lead contamination is a different animal from PFAS. The EPA's Lead and Copper Rule addresses lead in drinking water, but here's the thing: lead contamination usually doesn't come from the source water or the treatment plant. It comes from lead service lines and lead solder in older home plumbing.
New Haven is an older city – much of the housing stock predates 1986, when the Safe Drinking Water Act amendments banned lead solder in new plumbing. Homes built before 1986, and especially before 1978, may have lead service lines or lead solder at fixtures. The RWA's water tests negative for lead at the treatment plant. But by the time water travels through older municipal lines and your home's pipes, the result can be different.
If you're in an older building – especially a pre-1950s home or a multi-family rental – testing your own tap water for lead is the only way to know for certain. The state of Connecticut runs programs to help residents test for free in some cases.
This is worth sitting with for a moment. RWA's PFOA and PFOS results sit above the EPA's new 4 ppt limits, which means the utility will need to add or expand treatment before the federal compliance deadline. The 2024 MCLs themselves didn't arise from research showing 4 ppt is safe for everyone – they reflect feasibility: what water treatment can reliably achieve at scale.
The EPA set its health-based goal (the Maximum Contaminant Level Goal) for PFOA and PFOS at zero, reflecting evidence that these compounds carry health risks, including effects on immune function, at very low doses. The National Academies of Sciences, Engineering, and Medicine's 2022 report on PFAS recommends clinical follow-up for people with elevated exposure and flags sensitive groups – pregnant people, infants, and those with immune conditions – as warranting extra caution.
That's not a reason to panic. It's a reason to understand what's actually in your water and make an informed decision about filtration.
If you want to reduce your PFAS exposure from tap water, the most effective options are:
Reverse osmosis filtration removes 90-99% of PFAS compounds. Under-sink RO systems like the iSpring RCC7 or the Waterdrop G3 are effective and don't require whole-house installation. They cost $150-350 upfront and roughly $50-100/year in filter replacements.
Activated carbon pitcher filters (Brita, ZeroWater, Clearly Filtered) reduce PFAS by 50-90% depending on the filter model and contaminant. Clearly Filtered publishes brand lab data for PFAS but is certified only to NSF/ANSI 42 and 372, while ZeroWater is certified to NSF/ANSI 53 for PFOA/PFOS – check the certification claims specifically for the filters you're considering.
Point-of-use carbon block filters (mounted under the sink or at the faucet) provide solid PFAS reduction at moderate cost, without the slower flow rate of RO systems.
For lead specifically: if you're in an older building, pitcher filters with NSF/ANSI 53 certification for lead are effective. RO systems also remove lead.
Before investing in filtration, check your specific address data. The tool shows what EPA testing actually found in your water system – so you can choose a filter based on what's actually in your water, not general anxiety about water quality.
New Haven's RWA water showed PFOA and PFOS above the EPA's 2024 MCLs in UCMR5 testing, so the utility faces treatment upgrades before the compliance deadline. Lead risk depends on your specific building's plumbing age more than on source water quality.
If you have young children, are pregnant, or have immune-system concerns, the research supports reducing PFAS exposure wherever you can. A certified pitcher filter is a reasonable first step. An under-sink RO system removes more contaminants and is a better long-term investment.
Check your zip code to see the exact PFAS levels reported for your water system – and to get a detailed report if you want to go deeper.
Is New Haven tap water safe to drink in 2026? New Haven's water, supplied by the Regional Water Authority, meets most EPA and Connecticut standards, but UCMR5 testing found PFOA and PFOS above the EPA's 2024 maximum contaminant levels of 4 parts per trillion at the RWA entry point. The utility has until the federal deadline to add treatment, and researchers note there is no established safe level of PFAS exposure for sensitive populations including pregnant women and young children.
Does New Haven tap water have PFAS? Yes. PFAS were detected in the Regional Water Authority's system during EPA UCMR5 testing, with PFOA and PFOS samples above the EPA's 2024 maximum contaminant levels of 4 parts per trillion. To see the specific numbers for your zip code, check KnowYourExposure.com.
What water system serves New Haven, Connecticut? The Regional Water Authority (RWA), formerly known as the South Central Connecticut Regional Water Authority, provides drinking water to New Haven and more than 20 surrounding towns. The system draws from surface reservoirs including Lake Saltonstall, Lake Gaillard, and Lake Whitney.
What water filter removes PFAS from New Haven tap water? Reverse osmosis systems are the most effective, removing 90-99% of PFAS compounds. Under-sink RO units typically cost $150-350 plus annual filter replacement. Certified pitcher filters (look for NSF/ANSI 53 and 58 certification claims specific to PFAS) offer a lower-cost option that removes 50-90% of PFAS.
Does New Haven water have lead? The Regional Water Authority's source water and treatment plant test negative for lead. However, lead exposure in New Haven most often comes from lead service lines and lead solder in older home plumbing, not from the utility itself. Homes built before 1986 carry higher risk. Testing your own tap water is the only way to confirm lead levels in your specific home.