We read 14 results from Manhasset Lakeville WD’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 43,000 people · Water system ID NY2902836 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)highest measured · range ND to 2.36 · listed as a violation in the report · Wells · 2025 report, page 7 | 2.36 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| PFNA (a PFAS)highest measured · range ND to 19 · listed as a violation in the report · Wells · 2025 report, page 7 | 19 ppt | None set | 10 ppt from 2029 | Above the federal limit that takes effect in 20291.9x the 10 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 10 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOA (a PFAS)highest measured · range ND to 7.93 · listed as a violation in the report · Wells · 2025 report, page 7 | 7.93 ppt | 0.007 ppt | 10 ppt (New York) now; 4 ppt from 2029 | Above the federal limit that takes effect in 20292x the 4 ppt federal limit that takes effect in 2029; below the 10 ppt New York limitNot a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Radium (combined 226 + 228)highest measured · range 0.37 to 2.45 · listed as a violation in the report · Wells · 2025 report, page 7 | 2.45 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Uraniumhighest measured · range ND to 3.8 · listed as a violation in the report · sampled 2019 · Wells · 2025 report, page 7 | 3.8 ppb | 0.6 ppb | 30 ppb | Above the health goal6.3x the health goal |
| Bariumhighest measured · range ND to 0.0027 · listed as a violation in the report · printed as 2.7 ug/l · Wells · 2025 report, page 7 | 0.0027 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 4 to 158 · listed as a violation in the report · Wells · 2025 report, page 7 | 158 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorinehighest measured · range 0.1 to 0.89 · listed as a violation in the report · Distribution system · 2025 report, page 7 | 0.89 ppm | None set | 4 ppm | Below the legal limit |
| Ironhighest measured · range ND to 0.0029 · listed as a violation in the report · printed as 2.9 ug/l · Wells · 2025 report, page 7 | 0.0029 ppm | — | 0.3 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 6.3 · listed as a violation in the report · Wells · 2025 report, page 7 | 6.3 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range ND to 2.6 · listed as a violation in the report · Wells · 2025 report, page 7 | 2.6 ppb | 30 ppb | 50 ppb | Below the health goal |
| Sulfatehighest measured · range ND to 29.4 · listed as a violation in the report · Wells · 2025 report, page 7 | 29.4 ppm | — | 250 ppm guideline | Within the guideline |
| Nickelhighest measured · range ND to 8.3 · listed as a violation in the report · Wells · 2025 report, page 7 | 8.3 ppb | None set | None | No health limit |
| Sodiumhighest measured · range 3.4 to 62.3 · listed as a violation in the report · Wells · 2025 report, page 7 | 62.3 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Manhasset Lakeville WD’s water between Feb 2025 and Aug 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5.3 pptFound in 2 of 19 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFNA19 pptFound in 1 of 19 samples · highest resultNo federal limit in force for this one
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.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228), Uranium
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFNA (a PFAS), PFOA (a PFAS), PFOA (EPA testing)
What removes it: Reverse osmosis.
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