Connecticut water, with sources attached.
The numbers below are the ones we can stand behind, each carrying its citation. Where the data is still being gathered, we say so.
Private wells serve Connecticut homes. No utility tests them; testing is the owner's job.
Source: CT DPH, 2020 census basisIn July 2026, nine Connecticut shoreline towns were placed under a mandatory boil water order after E. coli was detected in the public supply. Restaurants closed. Thousands of households were told not to drink their tap water. The order was lifted the next day. Nobody knew there was a problem until a sample was tested.
Source: Connecticut Water Co. / news reports, July 2026Municipal water is monitored at the system. Not at your tap.
That is the EPA's enforceable limit for PFOA and PFOS, two PFAS compounds, finalized in 2024. PFAS have been detected in public water supplies across Connecticut, and microplastics have been documented in drinking water supplies worldwide. Neither has a taste, a color, or a smell. A lab report is the only way to see them.
Source: EPA 2024 PFAS rule · EPA UCMR 5 monitoring / WHO drinking water reviewMost homes test fine. These numbers describe why testing is the only way to know, not who has a problem.
What Connecticut bedrock can add.
In bedrock wells, arsenic, uranium, and radon can be present with no taste, no color, no smell. They occur naturally in the rock itself, which is why neighboring wells can test very differently.
A USGS study of more than 2,000 private wells in Connecticut bedrock aquifers found 3.9 percent of samples above the EPA arsenic limit of 10 micrograms per liter and 4.7 percent above the uranium limit of 30 micrograms per liter.
Source: USGS Open-File Report 2020-1111Detected upstream, and downstream.
PFAS have been detected in public water supplies across Connecticut. The EPA finalized enforceable limits for PFOA and PFOS in 2024 at 4 parts per trillion, and federal compliance timelines are still being finalized. Lead can enter water from a home’s own plumbing, downstream of anything the utility measures.
Source: EPA UCMR 5 monitoring · EPA 2024 PFAS rule and May 2026 proposalsYour numbers are one visit away.
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