We read 15 results from City of Frederick’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 54,000 people · Water system ID MD0100015 · 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 |
|---|---|---|---|---|
| Atrazinehighest measured · range ND to 0.73 · listed as a violation in the report · Treatment plants · 2025 report, page 4 | 0.73 ppb | 0.15 ppb | 3 ppb | Above the health goal4.9x the health goal |
| Gross alpha (radioactivity)highest measured · range ND to 2.7 · listed as a violation in the report · sampled 2021 · Treatment plants · 2025 report, page 4 | 2.7 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of 37 homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 4 | 1.6 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal8x the health goal |
| PFOA (a PFAS)highest measured · range ND to 2.9 · Treatment plants · 2025 report, page 5 | 2.9 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal414x the health goal |
| PFOS (a PFAS)highest measured · range ND to 4.5 · Treatment plants · 2025 report, page 5 | 4.5 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.1x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Bariumhighest measured · range ND to 0.04 · listed as a violation in the report · Treatment plants · 2025 report, page 4 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 0.98 to 1.22 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 1.22 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 37 homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 4 | 0.12 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 13.8 to 48.8 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 43.2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 13.3 to 102 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 72.7 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.51 to 0.74 · listed as a violation in the report · Treatment plants · 2025 report, page 4 | 0.74 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range ND to 1.9 · listed as a violation in the report · Treatment plants · 2025 report, page 4 | 1.9 ppm | 10 ppm | 10 ppm | Below the health goal |
| Simazinehighest measured · range ND to 0.24 · listed as a violation in the report · Treatment plants · 2025 report, page 4 | 0.24 ppb | 4 ppb | 4 ppb | Below the health goal |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · Treatment plants · 2025 report, page 4 | 0.26 NTU | None set | 1 NTU | Below the legal limit |
| Sodiumhighest measured · range 1.4 to 25.7 · Treatment plants · 2025 report, page 5 | 25.7 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.
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.
Industrial chemicals and pesticides
Found: Atrazine
What removes it: Carbon block or RO.
Radium and uranium
Found: Gross alpha (radioactivity)
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOS (a PFAS)
What removes it: Reverse osmosis.
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