We read 24 results from City of Seal Beach’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 24,937 people · Water system ID CA3010041 · 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 |
|---|---|---|---|---|
| Bromateaverage · range ND to 8.4 · Metropolitan treated surface water · 2025 report, page 6 | 2.4 ppb | 0.1 ppb | 10 ppb | Above the health goal24x the health goal |
| Total dissolved solidsaverage · range 465 to 625 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 545 ppm | — | 500 ppm guideline | Above the guideline1.1x the guideline (taste, odor or stains; not a health limit) |
| Uraniumaverage · range ND to 4.47 · printed as 1 pCi/L · Metropolitan treated surface water · 2025 report, page 6 | 1.49 ppb | 0.6 ppb | 30 ppb | Above the health goal2.5x the health goal |
| Aluminumaverage · range ND to 0.08 · Metropolitan treated surface water · 2025 report, page 6 | 0.06 ppm | — | 0.2 ppm guideline | Within the guideline |
| Bariumaverage · range 0.13 to 0.13 · Metropolitan treated surface water · 2025 report, page 6 | 0.13 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 84 to 99 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 92 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.41 to 1.43 · Distribution system · 2025 report, page 4 | 1.1 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 31 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 4 | 0.09 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range ND to 17 · Distribution system · 2025 report, page 4 | 7 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 3.2 to 34 · Distribution system · 2025 report, page 4 | 24 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.6 to 0.8 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 0.7 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 31 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 4 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| pHaverage · range 8.2 to 8.8 · Seal Beach groundwater · 2025 report, page 5 | 8.4 | — | — | Normal range |
| Sulfateaverage · range 146 to 218 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 182 ppm | — | 250 ppm guideline | Within the guideline |
| Turbidity (cloudiness)average · range ND to 0.76 · Distribution system, highest of 2 sources · 2025 report, page 4 | 0.22 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 120 to 141 · Seal Beach groundwater, highest of 2 sources · 2025 report, page 5 | 130 ppm | None set | None | No health limit |
| Boronaverage · range 0.13 to 0.13 · Metropolitan treated surface water · 2025 report, page 6 | 0.13 ppm | None set | None | No health limit |
| Calciumaverage · range 44 to 68 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 56 ppm | None set | None | No health limit |
| Conductivityaverage · range 759 to 987 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 873 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 11.2 to 16.4 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 13.8 gpg (236 ppm) | — | — | Very hard |
| Lithiumaverage · range ND to 36 · sampled 2023 · Metropolitan treated surface water · 2025 report, page 6 | 22 ppb | None set | None | No health limit |
| Magnesiumaverage · range 19 to 25 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 22 ppm | None set | None | No health limit |
| Potassiumaverage · range 3.8 to 4.8 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 4.3 ppm | None set | None | No health limit |
| Sodiumaverage · range 78 to 97 · Metropolitan treated surface water, highest of 2 sources · 2025 report, page 6 | 88 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 Seal Beach’s water between Mar 2023 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium35.5 ppbFound in 3 of 10 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: Total dissolved solids
What removes it: Reverse osmosis.
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