We read 7 results from Town of Poolesville’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 5,400 people · Water system ID MD0150002 · 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 |
|---|---|---|---|---|
| Arsenicas reported · range ND to 4.18 · 2025 report, page 2 | 4.18 ppb | 0.004 ppb | 10 ppb | Above the health goal1,045x the health goal |
| Gross beta (radioactivity)as reported · range ND to 5.8 · 2025 report, page 3 | 5.8 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)as reported · range ND to 2.1 · 2025 report, page 3 | 2.1 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Antimonyas reported · range ND to 0.4 · 2025 report, page 2 | 0.4 ppb | 1 ppb | 6 ppb | Below the health goal |
| Bariumas reported · range 0.15 to 1.33 · 2025 report, page 2 | 1.33 ppm | 2 ppm | 2 ppm | Below the health goal |
| Fluorideas reported · range ND to 0.17 · 2025 report, page 2 | 0.17 ppm | 1 ppm | 4 ppm | Below the health goal |
| Seleniumas reported · range ND to 4 · 2025 report, page 2 | 4 ppb | 30 ppb | 50 ppb | Below the health goal |
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 Town of Poolesville’s water between Feb 2023 and Nov 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5.4 pptFound in 9 of 19 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS6.5 pptFound in 7 of 19 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS6.9 pptFound in 2 of 19 samples · highest resultNo federal limit in force for this one
- PFBS4.8 pptFound in 6 of 19 samples · highest resultNo federal limit in force for this one
- Lithium41.1 ppbFound in 19 of 19 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.
Radium and uranium
Found: Gross beta (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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