We read 12 results from Liberty Utilities - Compton’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 26,371 people · Water system ID CA1910021 · 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 |
|---|---|---|---|---|
| Radium-228average · range 1.1 to 1.1 · listed as a violation in the report · Liberty wells · 2025 report, page 8 | 1.1 pCi/L | 0.02 pCi/L | 5 pCi/L | Above the health goal58x the health goal |
| Aluminumaverage · range ND to 0.08 · listed as a violation in the report · MWD · 2025 report, page 7 | 0.06 ppm | — | 0.2 ppm guideline | Within the guideline |
| Chlorineaverage · range 1.07 to 1.15 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 1.1 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 32 homes tested, 0 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 7 | 0.2 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range 2 to 9.8 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 5.3 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 6 to 49 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 24 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.6 to 0.87 · listed as a violation in the report · Fluoridated area · 2025 report, page 6 | 0.76 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 32 homes tested, 0 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 7 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Total dissolved solidsaverage · range 290 to 310 · listed as a violation in the report · Liberty wells · 2025 report, page 8 | 300 ppm | — | 500 ppm guideline | Within the guideline |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · MWD treated surface water · 2025 report, page 7 | 0.05 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 160 to 190 · Liberty wells · 2025 report, page 8 | 175 ppm | None set | None | No health limit |
| Hardnessaverage · range 8.19 to 9.94 · Liberty wells · 2025 report, page 8 | 9.06 gpg (155 ppm) | — | — | Hard |
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 Liberty Utilities - Compton’s water between Feb 2023 and Nov 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium67.7 ppbFound in 7 of 12 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.
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