We read 25 results from Twentynine Palms Water District’s 2017 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 18,795 people · Water system ID CA3610049 · Read the district’s 2017 report (opens in a new tab)
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Results from the 2017 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 7 · sampled 2024 · 2017 report, page 2 | 1.9 ppb | 0.004 ppb | 10 ppb | Above the health goal475x the health goal |
| Chromium-6average · range ND to 9.2 · sampled 2024 · 2017 report, page 2 | 5.9 ppb | 0.02 ppb | 10 ppb | Above the health goal295x the health goal |
| Fluorideaverage · range ND to 2 · sampled 2024 · 2017 report, page 2 | 1.16 ppm | 1 ppm | 2 ppm | Above the health goal1.2x the health goal |
| Gross alpha (radioactivity)average · range 3.4 to 14 · sampled 2024 · 2017 report, page 2 | 9.3 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Uraniumaverage · range 8.05 to 19.4 · printed as 8.8 pCi/L · sampled 2024 · 2017 report, page 2 | 13.1 ppb | 0.6 ppb | 30 ppb | Above the health goal22x the health goal |
| Chlorideaverage · range 7.1 to 30 · sampled 2024 · 2017 report, page 2 | 13 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.04 to 2.13 · sampled 2024 · 2017 report, page 2 | 0.42 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2017 report, page 2 | Not detected | 0.3 ppm | 1.3 ppm (action level) | Not detected |
| Disinfection byproducts (HAA5)average · range ND to 2.4 · sampled 2024 · 2017 report, page 2 | 0.85 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range 1.3 to 22 · sampled 2024 · 2017 report, page 2 | 8.35 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2017 report, page 2 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 0.64 to 7.1 · sampled 2024 · 2017 report, page 2 | 2.44 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHaverage · range 7 to 8.35 · sampled 2024 · 2017 report, page 2 | 7.7 | — | — | Normal range |
| Sulfateaverage · range 9.1 to 97 · sampled 2024 · 2017 report, page 2 | 30 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 160 to 400 · sampled 2024 · 2017 report, page 2 | 228 ppm | — | 500 ppm guideline | Within the guideline |
| Alkalinityaverage · range 72 to 150 · sampled 2024 · 2017 report, page 2 | 100 ppm | None set | None | No health limit |
| Boronaverage · range ND to 0.43 · printed as 100 ppb · sampled 2024 · 2017 report, page 2 | 0.1 ppm | None set | None | No health limit |
| Calciumaverage · range 17 to 33 · sampled 2024 · 2017 report, page 2 | 22 ppm | None set | None | No health limit |
| Conductivityaverage · range 240 to 650 · sampled 2024 · 2017 report, page 2 | 348 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 2.81 to 5.85 · sampled 2024 · 2017 report, page 2 | 4.04 gpg (69 ppm) | — | — | Moderately hard |
| Lithiumaverage · range 13.6 to 46.5 · sampled 2024 · 2017 report, page 2 | 24 ppb | None set | None | No health limit |
| Magnesiumaverage · range 1.4 to 5.5 · sampled 2024 · 2017 report, page 2 | 3.4 ppm | None set | None | No health limit |
| Potassiumaverage · range 1.1 to 2.2 · sampled 2024 · 2017 report, page 2 | 1.5 ppm | None set | None | No health limit |
| Sodiumaverage · range 18 to 120 · sampled 2024 · 2017 report, page 2 | 45 ppm | None set | None | No health limit |
| Vanadiumaverage · range 5 to 19 · sampled 2024 · 2017 report, page 2 | 10.5 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 Twentynine Palms Water District’s water between Oct 2024 and Apr 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium46.5 ppbFound in 14 of 14 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.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
Radium and uranium
Found: Gross alpha (radioactivity), Uranium
What removes it: Reverse osmosis.
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