We read 13 results from City of Calexico’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 40,357 people · Water system ID CA1310002 · 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 |
|---|---|---|---|---|
| Sulfateaverage · Treated water · 2025 report, page 2 | 270 ppm | — | 250 ppm guideline | Above the guideline1.1x the guideline (taste, odor or stains; not a health limit) |
| Total dissolved solidsaverage · Treated water · 2025 report, page 2 | 670 ppm | — | 500 ppm guideline | Above the guideline1.3x the guideline (taste, odor or stains; not a health limit) |
| Aluminumaverage · range ND to 0.25 · Treated water · 2025 report, page 2 | 0.1 ppm | — | 0.2 ppm guideline | Within the guideline |
| Bariumaverage · Treated water · 2025 report, page 2 | 0.12 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · Treated water · 2025 report, page 2 | 120 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.5 to 0.8 · Distribution system · 2025 report, page 2 | 0.6 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 34 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 3 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 10 to 69 · Distribution system · 2025 report, page 2 | 29 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 21 to 86 · Distribution system · 2025 report, page 2 | 70 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · Treated water · 2025 report, page 2 | 0.34 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 34 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Hardnessaverage · Treated water · 2025 report, page 3 | 18.7 gpg (320 ppm) | — | — | Very hard |
| Sodiumaverage · Treated water · 2025 report, page 3 | 110 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. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Calexico’s water between Jan 2024 and Oct 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium59 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 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.
Salty taste / high TDS
Found: Sulfate, Total dissolved solids
What removes it: Reverse osmosis.
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