We read 17 results from Rochester Water Dept’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 25,000 people · Water system ID NH2001010 · 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 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 6 | 2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal10x the health goal |
| Manganeseas reported · Surface Water, highest of 2 sources · 2025 report, page 7 | 0.1 ppm | — | 0.05 ppm guideline | Above the guideline1.9x the guideline (taste, odor or stains; not a health limit) |
| PFOA (a PFAS)single sample · Cocheco Well Groundwater, highest of 2 sources · 2025 report, page 7 | 4.92 ppt | 0.007 ppt | 12 ppt (New Hampshire) now; 4 ppt from 2029 | Above the federal limit that takes effect in 20291.2x the 4 ppt federal limit that takes effect in 2029; below the 12 ppt New Hampshire limitNot a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOS (a PFAS)single sample · Cocheco Well Groundwater, highest of 2 sources · 2025 report, page 7 | 3.67 ppt | 1 ppt | 15 ppt (New Hampshire) now; 4 ppt from 2029 | Above the health goal3.7x the health goal |
| Bariumas reported · Surface Water, highest of 2 sources · 2025 report, page 6 | 0.0047 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideas reported · Cocheco Well, highest of 2 sources · 2025 report, page 7 | 23 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · Distribution system · 2025 report, page 6 | 1.01 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 6 | 0.18 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 86 · Site 324 · 2025 report, page 6 | 48 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 1.4 to 110 · Site 324 · 2025 report, page 6 | 63 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideas reported · Surface Water, highest of 2 sources · 2025 report, page 6 | 0.58 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironas reported · Cocheco Well · 2025 report, page 7 | 0.29 ppm | — | 0.3 ppm guideline | Within the guideline |
| Sulfateas reported · Surface Water, highest of 2 sources · 2025 report, page 7 | 19 ppm | — | 250 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · Surface water plant · 2025 report, page 6 | 0.11 NTU | None set | 1 NTU | Below the legal limit |
| Zincas reported · Cocheco Well, highest of 2 sources · 2025 report, page 7 | 0.03 ppm | — | 5 ppm guideline | Within the guideline |
| Nickelas reported · printed as 0.0015 mg/L · Cocheco Well · 2025 report, page 7 | 1.5 ppb | None set | None | No health limit |
| Sodiumas reported · Surface Water, highest of 2 sources · 2025 report, page 7 | 26 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: Lead
What removes it: Certified carbon block or RO.
Sediment or cloudy water
Found: Manganese
What removes it: Oxidation filter.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOS (a PFAS)
What removes it: Reverse osmosis.
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