We read 11 results from City of Imperial’s 2025 water quality report. No results over a legal limit or above a health goal.
Serves about 21,233 people · Water system ID CA1310006 · 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 |
|---|---|---|---|---|
| Bariumas reported · Treated water (Central Main Canal source) · 2025 report, page 4 | 0.12 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of 10 homes tested, 0 over the action level · Customer taps · 2025 report, page 5 | 0.03 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluorideas reported · Treated water (Central Main Canal source) · 2025 report, page 4 | 0.43 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 10 homes tested, 0 over the action level · Customer taps · 2025 report, page 5 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Alkalinityas reported · Treated water (Central Main Canal source) · 2025 report, page 5 | 160 ppm | None set | None | No health limit |
| Boronas reported · printed as 150 ppb · Treated water (Central Main Canal source) · 2025 report, page 5 | 0.15 ppm | None set | None | No health limit |
| Calciumas reported · Treated water (Central Main Canal source) · 2025 report, page 5 | 84 ppm | None set | None | No health limit |
| Hardnessas reported · Treated water (Central Main Canal source) · 2025 report, page 5 | 19.3 gpg (330 ppm) | — | — | Very hard |
| Magnesiumas reported · Treated water (Central Main Canal source) · 2025 report, page 5 | 30 ppm | None set | None | No health limit |
| Potassiumas reported · Treated water (Central Main Canal source) · 2025 report, page 5 | 5.5 ppm | None set | None | No health limit |
| Sodiumas reported · Treated water (Central Main Canal source) · 2025 report, page 5 | 120 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 City of Imperial’s water between Nov 2024 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium61 ppbFound in 4 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 in this report is above a health goal or legal limit. If you’re bothered by taste, smell, hardness or spots, or your home has older pipes, the filter catalog and buyer questions can help you pick, and a test of your own tap shows what your plumbing adds.
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