We read 21 results from Vernon-City, Water Dept.’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 28,112 people · Water system ID CA1910167 · 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 |
|---|---|---|---|---|
| Copper90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 8 | 0.47 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.6x the health goal |
| Manganeseaverage · range 0.04 to 0.11 · printed as 100 ppb · Groundwater · 2025 report, page 8 | 0.1 ppm | — | 0.05 ppm guideline | Above the guideline2x the guideline (taste, odor or stains; not a health limit) |
| Chlorideaverage · range 25 to 55 · Groundwater · 2025 report, page 8 | 42 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.2 to 1.02 · Distribution system · 2025 report, page 8 | 0.39 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)average · range ND to 1.8 · Distribution system · 2025 report, page 8 | 0.5 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)average · range ND to 8.6 · Distribution system · 2025 report, page 8 | 2.4 ppb | None set | 80 ppb | Below the legal limit |
| Ironaverage · range ND to 0.3 · printed as 110 ppb · Groundwater · 2025 report, page 8 | 0.11 ppm | — | 0.3 ppm guideline | Within the guideline |
| Lead90th percentile of 30 homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 8 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| PFOS (a PFAS)average · range ND to 5.9 · Groundwater · 2025 report, page 8 | Not detected | 1 ppt | 4 ppt from 2029 | Not detected |
| pHaverage · range 7.1 to 8.3 · Groundwater · 2025 report, page 8 | 7.7 | — | — | Normal range |
| Sulfateaverage · range 80 to 100 · Groundwater · 2025 report, page 8 | 87 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 340 to 470 · Groundwater · 2025 report, page 8 | 390 ppm | — | 500 ppm guideline | Within the guideline |
| Trichloroethylene (TCE)average · range ND to 0.58 · Groundwater · 2025 report, page 8 | Not detected | 1.7 ppb | 5 ppb | Not detected |
| Turbidity (cloudiness)average · range 0.1 to 0.8 · Groundwater · 2025 report, page 8 | 0.29 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 180 to 230 · Groundwater · 2025 report, page 8 | 210 ppm | None set | None | No health limit |
| Calciumaverage · range 61 to 71 · Groundwater · 2025 report, page 8 | 64 ppm | None set | None | No health limit |
| Conductivityaverage · range 580 to 650 · Groundwater · 2025 report, page 8 | 620 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 12.3 to 14.6 · Groundwater · 2025 report, page 8 | 12.9 gpg (220 ppm) | — | — | Very hard |
| Magnesiumaverage · range 14 to 17 · Groundwater · 2025 report, page 8 | 15 ppm | None set | None | No health limit |
| Potassiumaverage · range 3.5 to 4.1 · Groundwater · 2025 report, page 8 | 3.8 ppm | None set | None | No health limit |
| Sodiumaverage · range 37 to 59 · Groundwater · 2025 report, page 8 | 47 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 Vernon-City, Water Dept.’s water between Mar 2023 and Dec 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium56 ppbFound in 4 of 16 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.
Copper
Found: Copper
What removes it: Reverse osmosis.
Sediment or cloudy water
Found: Manganese
What removes it: Oxidation filter.
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