We read 11 results from Yarmouth Water Department’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 38,900 people · Water system ID MA4351000 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Lead90th percentile of 60 homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 1.5 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal7.5x the health goal |
| Radium (combined 226 + 228)highest measured · range ND to 2.3 · listed as a violation in the report · sampled 2021 · Wells · 2025 report, page 2 | 2.3 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.004 to 0.09 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 2 | 0.09 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineaverage · range 0.01 to 0.06 · listed as a violation in the report · Distribution system · 2025 report, page 2 | 0.04 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)highest measured · range ND to 2.8 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 2 | 2.8 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of 60 homes tested, 0 over the action level · Customer taps · 2025 report, page 2 | 0.21 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 3 · listed as a violation in the report · Distribution system · 2025 report, page 2 | 0.8 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 12 · listed as a violation in the report · Distribution system · 2025 report, page 2 | 3.8 ppb | None set | 80 ppb | Below the legal limit |
| Nitrate (as N)highest measured · range 0.3 to 5.1 · listed as a violation in the report · Wells · 2025 report, page 2 | 5.1 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFAS (total of measured)highest running annual average · range ND to 7.3 · listed as a violation in the report · Wells · 2025 report, page 3 | 7.3 ppt | None set | None | No health limit |
| Sodiumaverage · range 12 to 100 · sampled 2024 · Wells · 2025 report, page 3 | 31 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Yarmouth Water Department’s water between Jan 2025 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFHxS3.1 pptFound in 2 of 30 samples · highest resultNo federal limit in force for this one
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
Radium and uranium
Found: Radium (combined 226 + 228)
What removes it: Reverse osmosis.
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