We read 20 results from Westminster City of’s 2024 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 202,078 people · Water system ID CO0101170 · Read the district’s 2024 report (opens in a new tab)
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Results from the 2024 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)highest measured · range 0.55 to 0.68 · sampled 2021 · Treatment plants · 2024 report, page 11 | 0.68 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Gross beta (radioactivity)highest measured · range 2.3 to 4.9 · sampled 2021 · Treatment plants · 2024 report, page 11 | 4.9 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested · Customer taps · 2024 report, page 13 | 1.3 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal6.5x the health goal |
| Radium (combined 226 + 228)highest measured · range 0.14 to 0.44 · sampled 2021 · Treatment plants · 2024 report, page 12 | 0.44 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Uraniumhighest measured · range 0.32 to 0.9 · sampled 2021 · Treatment plants · 2024 report, page 13 | 0.9 ppb | 0.6 ppb | 30 ppb | Above the health goal1.5x the health goal |
| 2,4-D (weed killer)highest measured · range ND to 0.21 · Treatment plants · 2024 report, page 11 | 0.21 ppb | 70 ppb | 70 ppb | Below the health goal |
| Bariumhighest measured · range 0.05 to 0.06 · Treatment plants · 2024 report, page 11 | 0.06 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 0.94 to 2.6 · Distribution system · 2024 report, page 11 | 2 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)highest measured · range ND to 0.9 · Treatment plants · 2024 report, page 11 | 0.9 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of homes tested · Customer taps · 2024 report, page 13 | 0.16 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 6.5 to 14.1 · Distribution system · 2024 report, page 12 | 11.3 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 21.2 to 45.3 · Distribution system · 2024 report, page 12 | 34.9 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.56 to 0.57 · Treatment plants · 2024 report, page 12 | 0.57 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.22 to 0.23 · Treatment plants · 2024 report, page 12 | 0.23 ppm | 10 ppm | 10 ppm | Below the health goal |
| Total dissolved solidshighest measured · range 219 to 284 · Distribution system · 2024 report, page 14 | 284 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · range 0.01 to 0.07 · Treatment plant · 2024 report, page 13 | 0.07 NTU | None set | 1 NTU | Below the legal limit |
| Hardnesshighest measured · range 6.55 to 8.71 · Distribution system · 2024 report, page 14 | 8.71 gpg (149 ppm) | — | — | Hard |
| Lithiumaverage · range 18.3 to 21.3 · Treatment plants (UCMR 5) · 2024 report, page 14 | 19.5 ppb | None set | None | No health limit |
| Nickelhighest measured · range ND to 1.2 · Treatment plants · 2024 report, page 12 | 1.2 ppb | None set | None | No health limit |
| Sodiumhighest measured · range 31 to 32 · Distribution system · 2024 report, page 14 | 32 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 Westminster City of’s water between Mar 2024 and Dec 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium21.3 ppbFound in 8 of 8 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), Gross beta (radioactivity), Radium (combined 226 + 228), Uranium
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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