We read 7 results from Hempstead (V)’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 56,000 people · Water system ID NY2902827 · 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 |
|---|---|---|---|---|
| Perchloratehighest measured · range ND to 1.2 · listed as a violation in the report · Entry points · 2025 report, page 7 | 1.2 ppb | 1 ppb | 6 ppb | Above the health goal1.2x the health goal |
| Bariumhighest measured · range 0.0036 to 0.0056 · listed as a violation in the report · Entry points · 2025 report, page 6 | 0.0056 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest measured · range 0.45 to 1.49 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 1.49 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 6 | 0.11 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Lead90th percentile of homes tested · listed as a violation in the report · Customer taps · 2025 report, page 6 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range ND to 1 · listed as a violation in the report · Entry points · 2025 report, page 6 | 1 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sodiumhighest measured · range 22.9 to 38 · listed as a violation in the report · Entry points · 2025 report, page 6 | 38 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. 3 numbers we weren’t sure about are held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Hempstead (V)’s water between Jul 2023 and Jan 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOS4.7 pptFound in 1 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
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.
Industrial chemicals and pesticides
Found: Perchlorate
What removes it: Carbon block or RO.
PFAS ("forever chemicals")
Found: PFOS (EPA testing)
What removes it: Reverse osmosis.
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