We read 10 results from City of Mountain House’s 2024 water quality report. No results over a legal limit or above a health goal.
Serves about 24,948 people · Water system ID CA3910027 · Read the district’s 2024 report (opens in a new tab)
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Results from the 2024 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 |
|---|---|---|---|---|
| Chloraminehighest measured · range 2.3 to 3 · Distribution system · 2024 report, page 7 | 3 ppm | None set | 4 ppm | Below the legal limit |
| Chloridesingle sample · Treated water · 2024 report, page 8 | 37 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of 64 homes tested, 0 over the action level · Customer taps · 2024 report, page 4 | 0.2 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest measured · range 21 to 26 · Distribution system · 2024 report, page 6 | 26 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · range 38 to 46 · Distribution system · 2024 report, page 6 | 46 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 64 homes tested, 0 over the action level · Customer taps · 2024 report, page 4 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Sulfatesingle sample · Treated water · 2024 report, page 8 | 33.1 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidssingle sample · Treated water · 2024 report, page 8 | 170 ppm | — | 500 ppm guideline | Within the guideline |
| Hardnesssingle sample · Treated water · 2024 report, page 5 | 3.83 gpg (65.4 ppm) | — | — | Moderately hard |
| Sodiumsingle sample · Treated water · 2024 report, page 5 | 30 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 in this report is above a health goal or legal limit. If you’re bothered by taste, smell, hardness or spots, or your home has older pipes, the filter catalog and buyer questions can help you pick, and a test of your own tap shows what your plumbing adds.
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