We read 14 results from Massapequa WD’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 43,000 people · Water system ID NY2902837 · 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 0.99 · listed as a violation in the report · sampled 2022 · Wells · 2025 report, page 3 | 0.99 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Manganesehighest measured · range ND to 0.07 · listed as a violation in the report · printed as 73.0 ug/l · Wells · 2025 report, page 3 | 0.07 ppm | — | 0.05 ppm guideline | Above the guideline1.5x the guideline (taste, odor or stains; not a health limit) |
| Radium (combined 226 + 228)highest measured · range 0.27 to 1.51 · listed as a violation in the report · sampled 2022 · Wells · 2025 report, page 3 | 1.51 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| 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 |
| Berylliumhighest measured · range ND to 0.33 · listed as a violation in the report · Wells · 2025 report, page 3 | 0.33 ppb | 1 ppb | 4 ppb | Below the health goal |
| Chloridehighest measured · range 3.6 to 26.9 · listed as a violation in the report · Wells · 2025 report, page 3 | 26.9 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorinehighest measured · range 0.3 to 1.3 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 1.3 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 3 | 0.14 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)highest measured · range ND to 1.7 · listed as a violation in the report · Distribution system · 2025 report, page 3 | 1.7 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of homes tested · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Sulfatehighest measured · range ND to 10.4 · listed as a violation in the report · Wells · 2025 report, page 3 | 10.4 ppm | — | 250 ppm guideline | Within the guideline |
| Uraniumhighest measured · range ND to 0.49 · listed as a violation in the report · sampled 2022 · Wells · 2025 report, page 3 | 0.49 ppb | 0.6 ppb | 30 ppb | Below the health goal |
| Nickelhighest measured · range 1 to 7.8 · listed as a violation in the report · Wells · 2025 report, page 3 | 7.8 ppb | None set | None | No health limit |
| Sodiumhighest measured · range 2.7 to 31.3 · listed as a violation in the report · Wells · 2025 report, page 3 | 31.3 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. 1 number we weren’t sure about is held back until a person checks.
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)
What removes it: Reverse osmosis.
Sediment or cloudy water
Found: Manganese
What removes it: Oxidation filter.
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