We read 13 results from Lafayette City of’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 28,700 people · Water system ID CO0107473 · 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 |
|---|---|---|---|---|
| Arsenicaverage · range ND to 1 · listed as a violation in the report · Entry point · 2025 report, page 9 | 0.5 ppb | 0.004 ppb | 10 ppb | Above the health goal125x the health goal |
| Gross alpha (radioactivity)average · range ND to 1.1 · listed as a violation in the report · sampled 2021 · Entry point · 2025 report, page 8 | 0.55 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of 30 homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 6 | 2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal10x the health goal |
| Radium (combined 226 + 228)average · range 0.6 to 1.1 · listed as a violation in the report · sampled 2021 · Entry point · 2025 report, page 8 | 0.85 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumaverage · range 0.05 to 0.05 · listed as a violation in the report · Entry point · 2025 report, page 9 | 0.05 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)average · range ND to 2 · listed as a violation in the report · Entry point · 2025 report, page 9 | 1 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 6 | 0.02 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range 23.1 to 35.6 · listed as a violation in the report · Distribution system · 2025 report, page 7 | 27.4 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 39.4 to 80.5 · listed as a violation in the report · Distribution system · 2025 report, page 7 | 54.7 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.57 to 0.6 · listed as a violation in the report · Entry point · 2025 report, page 9 | 0.59 ppm | 1 ppm | 4 ppm | Below the health goal |
| Seleniumaverage · range ND to 3 · listed as a violation in the report · Entry point · 2025 report, page 9 | 1.5 ppb | 30 ppb | 50 ppb | Below the health goal |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · Entry point · 2025 report, page 8 | 0.28 NTU | None set | 1 NTU | Below the legal limit |
| Sodiumaverage · range 28.1 to 28.8 · Entry point · 2025 report, page 9 | 28.5 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.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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