What EPA records show for Chelmsford Water District
EPA MA3056000 · serves Chelmsford, MA · about 28,750 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Chelmsford Water District (EPA MA3056000)
What EPA records show for Chelmsford Water District, as of October 14, 2026
Health-based violation: Stage 2 Disinfectants and Disinfection Byproducts Rule, TTHM, from Jan 2026, with no return-to-compliance action in EPA records (EPA SDWIS).
Lead, 90th percentile: 2.4 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
EPA's UCMR 5 testing looked for 30 contaminants here and found 5.
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 Chelmsford Water District use chloramine?
We didn't find chloramine in Chelmsford Water District'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 5.
PFOA (a PFAS): found in 7 of 8 samples, average 6.6 ppt, highest 8.9 ppt (EPA UCMR 5 testing, Oct 2023–Oct 2024) PFOA or PFOS averaged above 4.0 ppt in UCMR 5 testing
PFOS (a PFAS): found in 5 of 8 samples, average 3.5 ppt, highest 7.2 ppt (EPA UCMR 5 testing, Oct 2023–Oct 2024)
PFHxA (a PFAS): found in 7 of 8 samples, average 2.8 ppt, highest 3.5 ppt (EPA UCMR 5 testing, Oct 2023–Oct 2024)
PFPeA (a PFAS): found in 5 of 8 samples, average 2.1 ppt, highest 3.7 ppt (EPA UCMR 5 testing, Oct 2023–Oct 2024)
PFBS (a PFAS): found in 1 of 8 samples, average 0.50 ppt, highest 4.2 ppt (EPA UCMR 5 testing, Oct 2023–Oct 2024)
Lead, 90th percentile: 2.4 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Health-based violation: Stage 2 Disinfectants and Disinfection Byproducts Rule, TTHM, from Jan 2026, with no return-to-compliance action in EPA records (EPA SDWIS)
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.
We ship three things: the combo (Home Base $2,049, XL $2,149), carbon-only ($1,179), and the HW800 tankless RO ($569). Equipment only, shipped to your door; you or your plumber installs. Not available in Wisconsin yet. Pay by card or Affirm at checkout.
