We read 4 results from City of Norco’s 2024 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 25,068 people · Water system ID CA3310025 · 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 |
|---|---|---|---|---|
| Uraniumaverage · range ND to 17.4 · printed as 2.0 pCi/l · Norco systemwide · 2024 report, page 2 | 2.98 ppb | 0.6 ppb | 30 ppb | Above the health goal5x the health goal |
| Copper90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2024 report, page 2 | 0.11 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)average · range ND to 120 · Norco systemwide · 2024 report, page 2 | 61.4 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2024 report, page 2 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
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 City of Norco’s water between Sep 2023 and Jun 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA13.7 pptFound in 3 of 14 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS31.4 pptFound in 4 of 14 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS13.8 pptFound in 6 of 14 samples · highest resultNo federal limit in force for this one
- PFBS12.2 pptFound in 4 of 14 samples · highest resultNo federal limit in force for this one
- Lithium35.9 ppbFound in 8 of 14 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.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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