We read 22 results from Stockton Pws’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 1,892 people · Water system ID MO5010763 · 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 |
|---|---|---|---|---|
| Lead90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 1.4 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal7x the health goal |
| Radium (combined 226 + 228)highest measured · range 1.9 to 2.3 · sampled 2023 · 2025 report, page 2 | 2.3 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range 1.9 to 2.3 · sampled 2023 · 2025 report, page 2 | 2.3 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal46x the health goal |
| Aluminumhighest measured · range ND to 0.02 · 2025 report, page 3 | 0.02 ppm | — | 0.2 ppm guideline | Within the guideline |
| Bariumhighest measured · range 0.1 to 0.11 · 2025 report, page 2 | 0.11 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 23.2 to 46 · 2025 report, page 3 | 46 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 2 | 0.03 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (TTHM)highest running annual average · range 1.19 to 1.19 · DBPDUAL-01 · 2025 report, page 2 | 1 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.24 to 0.4 · 2025 report, page 2 | 0.4 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range 0.02 to 0.02 · 2025 report, page 3 | 0.02 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range 0.0012 to 0.0013 · 2025 report, page 3 | 0.0013 ppm | — | 0.05 ppm guideline | Within the guideline |
| pHhighest measured · range 7.81 to 7.91 · 2025 report, page 3 | 7.91 | — | — | Normal range |
| Sulfatehighest measured · range 22.4 to 24 · 2025 report, page 3 | 24 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 304 to 316 · 2025 report, page 3 | 316 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.0089 to 0.01 · 2025 report, page 3 | 0.01 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 290 to 290 · 2025 report, page 3 | 290 ppm | None set | None | No health limit |
| Calciumhighest measured · range 45.5 to 54.5 · 2025 report, page 3 | 54.5 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 11.6 to 13.5 · 2025 report, page 3 | 13.5 gpg (231 ppm) | — | — | Very hard |
| Magnesiumhighest measured · range 20.5 to 23.1 · 2025 report, page 3 | 23.1 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.53 to 1.59 · printed as 0.00159 MG/L · 2025 report, page 3 | 1.59 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 3.36 to 3.85 · 2025 report, page 3 | 3.85 ppm | None set | None | No health limit |
| Sodiumhighest measured · range 20.7 to 37.8 · 2025 report, page 3 | 37.8 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
Radium and uranium
Found: Radium (combined 226 + 228), Radium-226
What removes it: Reverse osmosis.
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