We read 12 results from Chatham Water Department’s 2024 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 30,000 people · Water system ID MA4055000 · Read the district’s 2024 report (opens in a new tab)
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Results from the 2024 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 |
|---|---|---|---|---|
| Copper90th percentile of 120 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2024 report, page 2 | 0.92 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal3.1x the health goal |
| Lead90th percentile of 120 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2024 report, page 2 | 1.5 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal7.5x the health goal |
| Bariumsingle sample · listed as a violation in the report · printed as 13 ppb · Treated water · 2024 report, page 2 | 0.01 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest measured · range ND to 1.17 · listed as a violation in the report · Distribution system · 2024 report, page 2 | 1.17 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest measured · range 5 to 6.05 · listed as a violation in the report · Distribution system · 2024 report, page 2 | 6.05 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · range 29 to 33 · listed as a violation in the report · Distribution system · 2024 report, page 2 | 33 ppb | None set | 80 ppb | Below the legal limit |
| Manganesesingle sample · printed as 50 ppb · Treated water · 2024 report, page 2 | 0.05 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 4.8 · listed as a violation in the report · Treated water · 2024 report, page 2 | 4.8 ppm | 10 ppm | 10 ppm | Below the health goal |
| Bromodichloromethanehighest measured · range 7 to 8.5 · Distribution system · 2024 report, page 2 | 8.5 ppb | None set | None | No health limit |
| Dibromochloromethanehighest measured · range 8.6 to 9.9 · Distribution system · 2024 report, page 2 | 9.9 ppb | None set | None | No health limit |
| PFAS (total of measured)average · range ND to 3.12 · listed as a violation in the report · Treated water · 2024 report, page 2 | 0.18 ppt | None set | None | No health limit |
| Sodiumsingle sample · Treated water · 2024 report, page 2 | 25 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.
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: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
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