We read 14 results from Monte Vista WD’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 56,017 people · Water system ID CA3610029 · 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 3.9 · Sources · 2025 report, page 8 | 2.1 ppb | 0.004 ppb | 10 ppb | Above the health goal525x the health goal |
| Chromium-6average · range ND to 7.1 · Sources · 2025 report, page 8 | 3.5 ppb | 0.02 ppb | 10 ppb | Above the health goal175x the health goal |
| Perchlorateaverage · range 0.2 to 2 · Sources · 2025 report, page 8 | 1.2 ppb | 1 ppb | 6 ppb | Above the health goal1.2x the health goal |
| Aluminumaverage · range ND to 0.06 · printed as 11 ppb · Sources · 2025 report, page 8 | 0.01 ppm | — | 0.2 ppm guideline | Within the guideline |
| Chlorineaverage · range ND to 1.3 · Distribution system · 2025 report, page 9 | 0.56 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 33 homes tested, 0 over the action level · Customer taps · 2025 report, page 9 | 0.07 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)average · range ND to 9 · Distribution system · 2025 report, page 9 | 8 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range ND to 57 · Distribution system · 2025 report, page 9 | 44 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range ND to 0.2 · Sources · 2025 report, page 8 | 0.11 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 33 homes tested, 0 over the action level · Customer taps · 2025 report, page 9 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 6.7 · Sources · 2025 report, page 8 | 4 ppm | 10 ppm | 10 ppm | Below the health goal |
| Tetrachloroethylene (PCE)average · range ND to 2.5 · Sources · 2025 report, page 8 | Not detected | 0.06 ppb | 5 ppb | Not detected |
| Turbidity (cloudiness)highest measured · Surface water plant · 2025 report, page 8 | 0.33 NTU | None set | 1 NTU | Below the legal limit |
| Vanadiumaverage · range ND to 9.9 · Sources · 2025 report, page 10 | 6.4 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 Monte Vista WD’s water between Mar 2025 and Dec 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOS5.6 pptFound in 4 of 25 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS7.4 pptFound in 7 of 24 samples · highest resultNo federal limit in force for this one
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.
Industrial chemicals and pesticides
Found: Perchlorate
What removes it: Carbon block or RO.
PFAS ("forever chemicals")
Found: PFOS (EPA testing)
What removes it: Reverse osmosis.
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