We read 14 results from City of Fullerton’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 139,461 people · Water system ID CA3010010 · 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 |
|---|---|---|---|---|
| Chromium-6average · range 0.22 to 1.4 · Groundwater wells · 2025 report, page 7 | 0.51 ppb | 0.02 ppb | 10 ppb | Above the health goal26x the health goal |
| Perchloratehighest measured · range ND to 2.5 · Groundwater wells · 2025 report, page 7 | 2.5 ppb | 1 ppb | 6 ppb | Above the health goal2.5x the health goal |
| Uraniumaverage · range 1.94 to 9.54 · printed as 3.1 pCi/L · sampled 2024 · Groundwater wells · 2025 report, page 7 | 4.62 ppb | 0.6 ppb | 30 ppb | Above the health goal7.7x the health goal |
| Chlorineaverage · range ND to 3.2 · Distribution system · 2025 report, page 6 | 1.3 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 54 homes tested, 0 over the action level · Customer taps (54 sites) · 2025 report, page 6 | 0.19 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range 1.1 to 12 · Distribution system · 2025 report, page 6 | 10 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 9.3 to 44 · Distribution system · 2025 report, page 6 | 32 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.39 to 0.68 · Distribution system · 2025 report, page 6 | 0.6 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 54 homes tested, 0 over the action level · Customer taps (54 sites) · 2025 report, page 6 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 1.2 to 6.1 · Groundwater wells · 2025 report, page 7 | 2.5 ppm | 10 ppm | 10 ppm | Below the health goal |
| Total dissolved solidsaverage · range 426 to 706 · Groundwater wells · 2025 report, page 7 | 492 ppm | — | 500 ppm guideline | Within the guideline |
| Hardnessaverage · range 11.4 to 21.9 · Groundwater wells · 2025 report, page 7 | 14.4 gpg (246 ppm) | — | — | Very hard |
| Lithiumaverage · range ND to 29 · Groundwater wells · 2025 report, page 8 | 9.4 ppb | None set | None | No health limit |
| Sodiumaverage · range 57 to 84 · Groundwater wells · 2025 report, page 7 | 67 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. 2 numbers we weren’t sure about are held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Fullerton’s water between Mar 2023 and Apr 2026. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA10.8 pptFound in 3 of 17 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS13.3 pptFound in 3 of 17 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS6.2 pptFound in 3 of 17 samples · highest resultNo federal limit in force for this one
- PFBS7.6 pptFound in 3 of 17 samples · highest resultNo federal limit in force for this one
- Lithium35.5 ppbFound in 7 of 16 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.
Industrial chemicals and pesticides
Found: Perchlorate
What removes it: Carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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