We read 8 results from Hyannis Water System, Town of Barnstable’s 2024 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 35,000 people · Water system ID MA4020004 · 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 |
|---|---|---|---|---|
| Tetrachloroethylene (PCE)highest measured · range ND to 0.68 · listed as a violation in the report · Treated water · 2024 report, page 2 | 0.68 ppb | 0.06 ppb | 5 ppb | Above the health goal11x the health goal |
| Bariumhighest measured · listed as a violation in the report · Treated water · 2024 report, page 2 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 0.72 to 0.89 · listed as a violation in the report · Distribution system · 2024 report, page 2 | 0.89 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 2.1 · listed as a violation in the report · Distribution system · 2024 report, page 2 | 2.1 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 1.3 · listed as a violation in the report · Distribution system · 2024 report, page 2 | 1.3 ppb | None set | 80 ppb | Below the legal limit |
| Nitrate (as N)highest measured · range ND to 4.9 · listed as a violation in the report · Treated water · 2024 report, page 2 | 4.9 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFAS (total of measured)highest running annual average · range ND to 1.59 · Treated water · 2024 report, page 2 | 0.13 ppt | None set | None | No health limit |
| Sodiumhighest measured · range ND to 40 · Treated water · 2024 report, page 2 | 40 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.
Industrial chemicals and pesticides
Found: Tetrachloroethylene (PCE)
What removes it: Carbon block or RO.
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