We read 20 results from Lake Hemet MWD’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 52,913 people · Water system ID CA3310022 · 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 ND to 1.8 · Wells · 2025 report, page 6 | 0.4 ppb | 0.02 ppb | 10 ppb | Above the health goal20x the health goal |
| Copper90th percentile of 37 homes tested, 0 over the action level · Customer taps · 2025 report, page 5 | 0.41 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.4x the health goal |
| Uraniumaverage · range ND to 8.34 · printed as 3.0 pCi/L · sampled 2024 · Wells · 2025 report, page 6 | 4.47 ppb | 0.6 ppb | 30 ppb | Above the health goal7.5x the health goal |
| Arsenicaverage · range ND to 7.8 · Wells · 2025 report, page 6 | Not detected | 0.004 ppb | 10 ppb | Not detected |
| Chlorideaverage · range 14 to 53 · Wells · 2025 report, page 6 | 25 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.6 to 3.1 · Distribution system · 2025 report, page 6 | 1.43 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)average · range ND to 6 · Distribution system · 2025 report, page 6 | 6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 2.5 to 36.1 · Distribution system · 2025 report, page 6 | 36.1 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range ND to 0.58 · Wells · 2025 report, page 6 | 0.2 ppm | 1 ppm | 2 ppm | Below the health goal |
| Gross alpha (radioactivity)average · range ND to 3.9 · sampled 2024 · Wells · 2025 report, page 6 | Not detected | 0 pCi/L | 15 pCi/L | Not detected |
| Lead90th percentile of 37 homes tested, 0 over the action level · Customer taps · 2025 report, page 5 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 0.6 to 4.8 · Wells · 2025 report, page 6 | 2.2 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumaverage · range ND to 7.6 · sampled 2024 · Wells · 2025 report, page 6 | 1.3 ppb | 30 ppb | 50 ppb | Below the health goal |
| Sulfateaverage · range 16.7 to 215 · Wells · 2025 report, page 6 | 45 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 206 to 542 · Wells · 2025 report, page 6 | 299 ppm | — | 500 ppm guideline | Within the guideline |
| Conductivityaverage · range 320 to 823 · Wells · 2025 report, page 6 | 479 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 3.45 to 17.3 · Wells · 2025 report, page 5 | 9.01 gpg (154 ppm) | — | — | Hard |
| Sodiumaverage · range 19 to 102 · Wells · 2025 report, page 5 | 36 ppm | None set | None | No health limit |
| Total organic carbonaverage · range ND to 1.3 · Wells · 2025 report, page 5 | 0.64 ppm | None set | None | No health limit |
| Vanadiumaverage · range 3.8 to 77 · Wells · 2025 report, page 5 | 13 ppb | 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 Lake Hemet MWD’s water between Apr 2024 and Mar 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium16.2 ppbFound in 6 of 19 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.
Copper
Found: Copper
What removes it: Reverse osmosis.
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