We read 10 results from Clifton WD’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 34,500 people · Water system ID CO0139180 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)single sample · listed as a violation in the report · sampled 2024 · Entry point · 2025 report, page 7 | 4.8 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of 31 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 6 | 2.2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal11x the health goal |
| Uraniumsingle sample · listed as a violation in the report · sampled 2024 · Entry point · 2025 report, page 8 | 2 ppb | 0.6 ppb | 30 ppb | Above the health goal3.3x the health goal |
| Bariumsingle sample · listed as a violation in the report · Entry point · 2025 report, page 8 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of 31 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 6 | 0.09 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range 11 to 50.7 · listed as a violation in the report · Distribution system · 2025 report, page 7 | 29.2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 22.8 to 63 · listed as a violation in the report · Distribution system · 2025 report, page 7 | 42.2 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · listed as a violation in the report · Entry point · 2025 report, page 8 | 0.69 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lithiumaverage · range ND to 14.3 · sampled 2023 · Entry point · 2025 report, page 9 | 6.93 ppb | None set | None | No health limit |
| Sodiumsingle sample · Entry point · 2025 report, page 9 | 72.2 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Clifton WD’s water between Feb 2023 and Nov 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium14.3 ppbFound in 2 of 4 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 alpha (radioactivity), Uranium
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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