We read 10 results from Patuxent Naval Air Station (Navfac-Wash)’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 22,000 people · Water system ID MD0180022 · 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 ND to 10 · Wells · 2025 report, page 6 | 10 ppb | 0.004 ppb | 10 ppb | Above the health goal2,500x the health goal |
| Gross beta (radioactivity)highest measured · range 4.3 to 6.7 · sampled 2024 · Wells · 2025 report, page 6 | 6.7 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · sampled 2020 · Wells · 2025 report, page 6 | 0.6 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range ND to 0.006 · Wells · 2025 report, page 6 | 0.006 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of homes tested, 0 over the action level · Customer taps · 2025 report, page 5 | 0.08 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · Distribution system (Bldg 2173) · 2025 report, page 6 | 1 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 10 · Distribution system (Bldg 2173) · 2025 report, page 6 | 10 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.39 to 0.59 · Wells · 2025 report, page 6 | 0.59 ppm | 1 ppm | 4 ppm | Below the health goal |
| Dibromochloromethanehighest measured · printed as 0.00116 mg/L · sampled 2024 · Distribution system (Bldg 2173) · 2025 report, page 6 | 1.16 ppb | None set | None | No health limit |
| Lithiumaverage · range ND to 19.7 · Wells · 2025 report, page 7 | 9.3 ppb | 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 Patuxent Naval Air Station (Navfac-Wash)’s water between Mar 2025 and Sep 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium19.7 ppbFound in 6 of 26 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.
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