We read 14 results from City of Adelanto’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 39,930 people · Water system ID CA3610001 · 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 |
|---|---|---|---|---|
| Arsenicaverage · range ND to 9.1 · listed as a violation in the report · Wells (post treatment) · 2025 report | 0.15 ppb | 0.004 ppb | 10 ppb | Above the health goal38x the health goal |
| Gross alpha (radioactivity)average · range ND to 6.6 · listed as a violation in the report · sampled 2023 · Wells · 2025 report | 3.98 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| PFHxS (a PFAS)highest measured · range 3.2 to 20 · Lower Booster, Well 01G · 2025 report | 20 ppt | None set | 10 ppt from 2029 | Above the federal limit that takes effect in 20292x the 10 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 10 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOA (a PFAS)highest measured · range 2.6 to 3 · Lower Booster, Well 01G · 2025 report | 3 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal429x the health goal |
| PFOS (a PFAS)highest measured · range ND to 5.1 · Lower Booster, Well 01G · 2025 report | 5.1 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20291.3x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Chlorideaverage · range 16 to 52 · listed as a violation in the report · Wells · 2025 report | 39 ppm | — | 250 ppm guideline | Within the guideline |
| Disinfection byproducts (HAA5)average · range ND to 8.9 · listed as a violation in the report · Distribution system · 2025 report | 3.35 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 1 to 49 · listed as a violation in the report · Distribution system · 2025 report | 18.4 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.28 to 1.4 · listed as a violation in the report · Wells (post treatment) · 2025 report | 0.53 ppm | 1 ppm | 2 ppm | Below the health goal |
| Manganeseaverage · range ND to 0.03 · listed as a violation in the report · printed as 0.93 ug/l · Wells (post treatment) · 2025 report | 0.00093 ppm | — | 0.05 ppm guideline | Within the guideline |
| Sulfateaverage · range 33 to 220 · listed as a violation in the report · Wells · 2025 report | 52 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 190 to 500 · listed as a violation in the report · Wells · 2025 report | 338 ppm | — | 500 ppm guideline | Within the guideline |
| Hardnessaverage · range 4.21 to 12.3 · Wells · 2025 report | 8.07 gpg (138 ppm) | — | — | Hard |
| Sodiumaverage · range 40 to 140 · Wells · 2025 report | 69 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 Adelanto’s water between Dec 2023 and Sep 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOS4.5 pptFound in 2 of 4 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS4.7 pptFound in 2 of 4 samples · highest resultNo federal limit in force for this one
- Lithium11.1 ppbFound in 2 of 2 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: PFHxS (a PFAS), PFOA (a PFAS), PFOS (a PFAS), PFOS (EPA testing)
What removes it: Reverse osmosis.
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