Can you drink Dedham tap water? What EPA records show
EPA MA3073000 · serves Dedham, MA · about 41,630 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
Dedham Westwood Water Dist. (EPA MA3073000)
ScoreYourWater.com gives no verdict on your tap water; it shows what the public records say, as of October 14, 2026. For Dedham's main utility, Dedham Westwood Water Dist.: 1 health-based violation since July 1, 2021 in EPA records (EPA SDWIS). EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
What EPA records show for Dedham Westwood Water Dist., as of October 14, 2026
Health-based violation: Stage 2 Disinfectants and Disinfection Byproducts Rule, TTHM, Oct 2021–Nov 2021 (EPA SDWIS).
Lead, 90th percentile: 2 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.
EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
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 Dedham Westwood Water Dist. use chloramine?
We didn't find chloramine in Dedham Westwood Water Dist.'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 4.
PFOA (a PFAS): found in 4 of 8 samples, average 2.9 ppt, highest 6.5 ppt (EPA UCMR 5 testing, Jan 2025–Oct 2025)
PFOS (a PFAS): found in 3 of 8 samples, average 1.8 ppt, highest 5.1 ppt (EPA UCMR 5 testing, Jan 2025–Oct 2025)
PFPeA (a PFAS): found in 2 of 8 samples, average 1.2 ppt, highest 5.9 ppt (EPA UCMR 5 testing, Jan 2025–Oct 2025)
PFHxA (a PFAS): found in 1 of 8 samples, average 0.50 ppt, highest 4.1 ppt (EPA UCMR 5 testing, Jan 2025–Oct 2025)
Lead, 90th percentile: 2 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, Oct 2021–Nov 2021 (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 don't give a safe or unsafe verdict. Here is what the public data shows: EPA records for Dedham's main utility, Dedham Westwood Water Dist., as of October 14, 2026. 1 health-based violation since July 1, 2021 in EPA records (EPA SDWIS). EPA's UCMR 5 testing looked for 30 contaminants here and found 4. A guideline and a legal limit are different things, and this is public data, not a test of your tap.
Which utility supplies water in Dedham?
Dedham Westwood Water Dist. is the main utility for Dedham in EPA's records (EPA MA3073000), serving about 41,630 people (EPA SDWIS). Your water bill names your utility.
Does Dedham tap water contain PFAS?
PFOA (a PFAS): found in 4 of 8 samples, average 2.9 ppt, highest 6.5 ppt (EPA UCMR 5 testing, Jan 2025–Oct 2025). PFOS (a PFAS): found in 3 of 8 samples, average 1.8 ppt, highest 5.1 ppt (EPA UCMR 5 testing, Jan 2025–Oct 2025). This is public data, not a test of your tap.
How recent is this data?
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026. Data may be one to three years old and may not reflect the water at your tap. If you want your own tap tested, use a state-certified laboratory.
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