We read 22 results from Malden Pws’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 3,706 people · Water system ID MO4010490 · 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 |
|---|---|---|---|---|
| Arsenichighest measured · range 2.38 to 2.38 · 2025 report, page 2 | 2.38 ppb | 0.004 ppb | 10 ppb | Above the health goal595x the health goal |
| Ironhighest measured · range 0.59 to 0.59 · 2025 report, page 3 | 0.59 ppm | — | 0.3 ppm guideline | Above the guideline2x the guideline (taste, odor or stains; not a health limit) |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 2.46 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal12x the health goal |
| Manganesehighest measured · range 0.44 to 0.44 · 2025 report, page 3 | 0.44 ppm | — | 0.05 ppm guideline | Above the guideline8.7x the guideline (taste, odor or stains; not a health limit) |
| Aluminumhighest measured · range 0.01 to 0.01 · 2025 report, page 3 | 0.01 ppm | — | 0.2 ppm guideline | Within the guideline |
| Bariumhighest measured · range 0.72 to 0.72 · 2025 report, page 2 | 0.72 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 9.17 to 9.17 · 2025 report, page 3 | 9.17 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 2 | 0.13 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 1.91 to 1.91 · DBPDUAL-01 · 2025 report, page 2 | 2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 15.2 to 15.2 · DBPDUAL-01 · 2025 report, page 2 | 15 ppb | None set | 80 ppb | Below the legal limit |
| pHhighest measured · range 8 to 8 · 2025 report, page 3 | 8 | — | — | Normal range |
| Sulfatehighest measured · range 29.6 to 29.6 · 2025 report, page 3 | 29.6 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 220 to 220 · 2025 report, page 3 | 220 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.45 to 0.45 · 2025 report, page 3 | 0.45 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 96.7 to 96.7 · 2025 report, page 3 | 96.7 ppm | None set | None | No health limit |
| Calciumhighest measured · range 40.8 to 40.8 · 2025 report, page 3 | 40.8 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 7.54 to 7.54 · 2025 report, page 3 | 7.54 gpg (129 ppm) | — | — | Hard |
| Lithiumhighest measured · range 62.8 to 62.8 · sampled 2024 · highest of 2 sources · 2025 report, page 3 | 62.8 ppb | None set | None | No health limit |
| Magnesiumhighest measured · range 6.67 to 6.67 · 2025 report, page 3 | 6.67 ppm | None set | None | No health limit |
| Nickelhighest measured · range 19.3 to 19.3 · printed as 0.0193 MG/L · 2025 report, page 3 | 19.3 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 1.18 to 1.18 · 2025 report, page 3 | 1.18 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 6.27 to 6.27 · 2025 report, page 3 | 6.27 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. 2 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 Malden Pws’s water between Mar 2023 and Feb 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium80.3 ppbFound in 6 of 6 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
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.
Sediment or cloudy water
Found: Iron, Manganese
What removes it: Oxidation filter.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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