We read 13 results from Hesperia WD’s 2022 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 100,744 people · Water system ID CA3610024 · Read the district’s 2022 report (opens in a new tab)
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Results from the 2022 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 |
|---|---|---|---|---|
| Arsenicaverage · range ND to 1.9 · Wells · 2022 report, page 3 | 0.13 ppb | 0.004 ppb | 10 ppb | Above the health goal33x the health goal |
| Gross alpha (radioactivity)average · range ND to 5 · Wells · 2022 report, page 3 | 1.74 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Chlorideaverage · range 5.6 to 41 · sampled 2021 · Wells · 2022 report, page 4 | 15.8 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.2 to 0.43 · Distribution system · 2022 report, page 3 | 0.22 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)average · range ND to 1.4 · Wells · 2022 report, page 3 | 0.09 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2022 report, page 4 | Not detected | 0.3 ppm | 1.3 ppm (action level) | Not detected |
| Disinfection byproducts (TTHM)highest running annual average · range 0.5 to 2.1 · Distribution system · 2022 report, page 3 | 1.3 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range ND to 0.65 · Wells · 2022 report, page 3 | 0.23 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 30 homes tested, 0 over the action level · Customer taps · 2022 report, page 4 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 2.7 · Wells · 2022 report, page 3 | 1.09 ppm | 10 ppm | 10 ppm | Below the health goal |
| Total dissolved solidsaverage · range 110 to 220 · sampled 2021 · Wells · 2022 report, page 4 | 153 ppm | — | 500 ppm guideline | Within the guideline |
| Hardnessaverage · range 1.58 to 7.6 · Wells · 2022 report, page 4 | 4.36 gpg (74.6 ppm) | — | — | Moderately hard |
| Sodiumaverage · range 15 to 31 · Wells · 2022 report, page 4 | 21.8 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 Hesperia WD’s water between Jul 2023 and Jan 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA10.2 pptFound in 2 of 30 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS11.1 pptFound in 3 of 30 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS10.5 pptFound in 3 of 30 samples · highest resultNo federal limit in force for this one
- Lithium10.2 ppbFound in 1 of 30 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.
Radium and uranium
Found: Gross alpha (radioactivity)
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
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