We read 11 results from Jericho WD’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 58,000 people · Water system ID NY2902831 · 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 · listed as a violation in the report · Customer taps · 2025 report, page 4 | 1.7 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal8.5x the health goal |
| PFOA (a PFAS)highest measured · range ND to 3.14 · listed as a violation in the report · Wells · 2025 report, page 4 | 3.14 ppt | 0.007 ppt | 10 ppt (New York) now; 4 ppt from 2029 | Above the health goal449x the health goal |
| Tetrachloroethylene (PCE)highest measured · range ND to 0.62 · listed as a violation in the report · Wells · 2025 report, page 3 | 0.62 ppb | 0.06 ppb | 5 ppb | Above the health goal10x the health goal |
| 1,1-Dichloroethylenehighest measured · range ND to 0.54 · listed as a violation in the report · Wells · 2025 report, page 3 | 0.54 ppb | 7 ppb | 7 ppb | Below the health goal |
| Bariumhighest measured · range ND to 0.01 · listed as a violation in the report · Wells · 2025 report, page 3 | 0.01 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest measured · range ND to 1.1 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 1.1 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested · listed as a violation in the report · Customer taps · 2025 report, page 4 | 0.23 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)highest measured · range ND to 2.1 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 2.1 ppb | None set | 80 ppb | Below the legal limit |
| Trichloroethylene (TCE)highest measured · range ND to 1.7 · listed as a violation in the report · Wells · 2025 report, page 3 | 1.7 ppb | 1.7 ppb | 5 ppb | Below the health goal |
| 1,4-Dioxanehighest measured · range ND to 0.78 · listed as a violation in the report · Wells · 2025 report, page 4 | 0.78 ppb | None set | None | No health limit |
| Sodiumhighest measured · range 3.5 to 25 · listed as a violation in the report · Wells · 2025 report, page 3 | 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: Lead
What removes it: Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (a PFAS)
What removes it: Reverse osmosis.
Industrial chemicals and pesticides
Found: Tetrachloroethylene (PCE)
What removes it: Carbon block or RO.
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