What EPA records show for CTWC - Unionville System
EPA system ID CT0520011 · serves Avon, CT · about 14,693 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
CTWC - Unionville System (EPA CT0520011)
What EPA records show for CTWC - Unionville System, as of October 14, 2026
Lead: 9 in 10 homes tested came in at or below 2.4 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2023–Dec 31, 2025). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does CTWC - Unionville System use chloramine?
We didn't find chloramine in CTWC - Unionville System's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
Reported results in EPA records (data as of Oct 14–15, 2026)
EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
PFBA (a PFAS): found in 2 of 10 samples, average 1.2 ppt, highest 7 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
PFOS (a PFAS): found in 2 of 10 samples, average 1.1 ppt, highest 6 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
PFOA (a PFAS): found in 2 of 10 samples, average 1 ppt, highest 6 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
PFHxA (a PFAS): found in 2 of 10 samples, average 0.70 ppt, highest 4 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
PFPeA (a PFAS): found in 2 of 10 samples, average 0.70 ppt, highest 4 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
PFHxS (a PFAS): found in 2 of 10 samples, average 0.60 ppt, highest 3 ppt (EPA UCMR 5 testing, Mar 2023–Dec 2023)
Lead: 9 in 10 homes tested came in at or below 2.4 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2023–Dec 31, 2025). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
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