We read 25 results from Concord Water Dept’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 18,788 people · Water system ID MA3067000 · 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 |
|---|---|---|---|---|
| Bromatehighest measured · sampled 2024 · 2025 report, page 2 | 7 ppb | 0.1 ppb | 10 ppb | Above the health goal70x the health goal |
| Copper90th percentile of 31 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 0.45 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.5x the health goal |
| Lead90th percentile of 31 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 5.1 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal25x the health goal |
| Bariumhighest measured · range 0.02 to 0.05 · printed as 47 ppb · sampled 2024 · 2025 report, page 2 | 0.05 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 67 to 213 · 2025 report, page 2 | 112 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorinehighest running annual average · range 0.09 to 0.87 · 2025 report, page 2 | 0.44 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 1.7 to 15.3 · 2025 report, page 2 | 15 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 7.2 to 30.3 · 2025 report, page 2 | 28 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.2 to 1 · 2025 report, page 2 | 1 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironaverage · range ND to 0.17 · printed as 88 ppb · 2025 report, page 2 | 0.09 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganeseaverage · range 0.003 to 0.06 · printed as 19 ppb · 2025 report, page 2 | 0.02 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range 0.5 to 2.5 · 2025 report, page 2 | 2.5 ppm | 10 ppm | 10 ppm | Below the health goal |
| Perchloratehighest measured · 2025 report, page 2 | 0.11 ppb | 1 ppb | 6 ppb | Below the health goal |
| pHaverage · range 7.4 to 7.7 · 2025 report, page 2 | 7.6 | — | — | Normal range |
| Sulfateaverage · range 18 to 36 · 2025 report, page 2 | 27 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 170 to 536 · 2025 report, page 2 | 351 ppm | — | 500 ppm guideline | Within the guideline |
| Zincaverage · range 0.04 to 0.06 · 2025 report, page 2 | 0.05 ppm | — | 5 ppm guideline | Within the guideline |
| Calciumaverage · range 17 to 32 · 2025 report, page 2 | 24 ppm | None set | None | No health limit |
| Hardnessaverage · range 3.39 to 6.84 · 2025 report, page 2 | 4.97 gpg (85 ppm) | — | — | Moderately hard |
| Magnesiumaverage · range 3.7 to 8.8 · 2025 report, page 2 | 6.2 ppm | None set | None | No health limit |
| PFAS (total of measured)highest running annual average · range 2.8 to 8.9 · 2025 report, page 2 | 8.9 ppt | None set | None | No health limit |
| PFBS (a PFAS)average · range ND to 5 · 2025 report, page 2 | 1.4 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range ND to 3.4 · 2025 report, page 2 | 1.7 ppt | None set | None | No health limit |
| Potassiumaverage · range 27 to 42 · 2025 report, page 2 | 35 ppm | None set | None | No health limit |
| Sodiumaverage · range 33 to 100 · 2025 report, page 2 | 51 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Concord Water Dept’s water between Feb 2024 and Aug 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA6 pptFound in 4 of 11 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFBS9.4 pptFound in 3 of 11 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.
Lead
Found: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (EPA testing)
What removes it: Reverse osmosis.
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