We read 11 results from Hawthorne-City Water Dept.’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 44,718 people · Water system ID CA1910047 · 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 |
|---|---|---|---|---|
| Total dissolved solidsaverage · sampled 2023 · Groundwater · 2025 report, page 14 | 530 ppm | — | 500 ppm guideline | Above the guideline1.1x the guideline (taste, odor or stains; not a health limit) |
| Chlorineaverage · range 0.2 to 2.7 · Distribution system · 2025 report, page 13 | 1.7 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 13 | 0.07 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 8.8 to 22 · Distribution system · 2025 report, page 13 | 16 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 23 to 59 · Distribution system · 2025 report, page 13 | 40 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.34 to 0.74 · Groundwater · 2025 report, page 13 | 0.58 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 13 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 0.71 · Groundwater · 2025 report, page 13 | Not detected | 10 ppm | 10 ppm | Not detected |
| Hardnessaverage · range 8.42 to 15.2 · Groundwater · 2025 report, page 15 | 12.4 gpg (212 ppm) | — | — | Very hard |
| PFBS (a PFAS)average · range ND to 3.1 · Groundwater · 2025 report, page 14 | 2.1 ppt | None set | None | No health limit |
| Sodiumaverage · range 89 to 113 · Groundwater · 2025 report, page 15 | 99 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 Hawthorne-City Water Dept.’s water between Jun 2023 and Mar 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium26.8 ppbFound in 6 of 6 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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