We read 22 results from Mountain View Pws’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 2,791 people · Water system ID MO4010551 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)highest measured · range 7.7 to 7.7 · sampled 2024 · 2025 report, page 2 | 7.7 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · range 2 to 2 · sampled 2024 · 2025 report, page 2 | 2 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range 2 to 2 · sampled 2024 · 2025 report, page 2 | 2 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal40x the health goal |
| Bariumhighest measured · range 0.02 to 0.03 · sampled 2024 · 2025 report, page 2 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 0.09 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 1.7 to 1.7 · DBPDUAL-01 · 2025 report, page 2 | 2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 4.33 to 4.33 · DBPDUAL-01 · 2025 report, page 2 | 4 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range ND to 0.15 · sampled 2024 · 2025 report, page 2 | 0.15 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range ND to 0.0065 · sampled 2024 · 2025 report, page 3 | 0.0065 ppm | — | 0.3 ppm guideline | Within the guideline |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range 0.09 to 0.24 · 2025 report, page 2 | 0.24 ppm | 10 ppm | 10 ppm | Below the health goal |
| pHhighest measured · range 7.94 to 8.09 · sampled 2024 · 2025 report, page 3 | 8.09 | — | — | Normal range |
| Sulfatehighest measured · range 7.4 to 9.97 · sampled 2024 · 2025 report, page 3 | 9.97 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 238 to 238 · sampled 2024 · 2025 report, page 3 | 238 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.0082 to 0.02 · sampled 2024 · 2025 report, page 3 | 0.02 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 243 to 281 · sampled 2024 · 2025 report, page 3 | 281 ppm | None set | None | No health limit |
| Calciumhighest measured · range 45.9 to 47.7 · sampled 2024 · 2025 report, page 3 | 47.7 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 13.4 to 13.9 · sampled 2024 · 2025 report, page 3 | 13.9 gpg (238 ppm) | — | — | Very hard |
| Magnesiumhighest measured · range 27.8 to 28.8 · sampled 2024 · 2025 report, page 3 | 28.8 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.51 to 2.02 · printed as 0.00202 MG/L · sampled 2024 · 2025 report, page 3 | 2.02 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 1.39 to 1.44 · sampled 2024 · 2025 report, page 3 | 1.44 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 3.99 to 4.25 · sampled 2024 · 2025 report, page 3 | 4.25 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.
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), Radium (combined 226 + 228), Radium-226
What removes it: Reverse osmosis.
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