We read 18 results from City of Turlock’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 72,682 people · Water system ID CA5010019 · 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 8.74 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 6 | 4.85 ppb | 0.004 ppb | 10 ppb | Above the health goal1,212x the health goal |
| Chromium-6average · range 2.88 to 6.76 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 6 | 4.45 ppb | 0.02 ppb | 10 ppb | Above the health goal223x the health goal |
| Gross alpha (radioactivity)average · range ND to 6.08 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 6 | 1.13 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Tetrachloroethylene (PCE)average · range ND to 3.18 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 6 | 0.83 ppb | 0.06 ppb | 5 ppb | Above the health goal14x the health goal |
| Uraniumaverage · range 8.52 to 11.9 · listed as a violation in the report · printed as 6.86 pCi/L · Groundwater (city wells) · 2025 report, page 6 | 10.2 ppb | 0.6 ppb | 30 ppb | Above the health goal17x the health goal |
| Bariumaverage · range ND to 0.15 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 6 | 0.06 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 9.3 to 51 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 7 | 27.4 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.83 to 0.98 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 0.9 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 62 homes tested, 0 over the action level · Customer taps · 2025 report, page 7 | 0.06 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 9.3 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 7.9 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range ND to 62.6 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 36.8 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range ND to 0.25 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 6 | 0.08 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 62 homes tested, 0 over the action level · Customer taps · 2025 report, page 7 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range 1.13 to 9.84 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 6 | 5.58 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sulfateaverage · range 3.3 to 19.4 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 7 | 10.7 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 202 to 298 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 7 | 237 ppm | — | 500 ppm guideline | Within the guideline |
| Hardnessaverage · range 1.53 to 9.01 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 7 | 5.21 gpg (89 ppm) | — | — | Moderately hard |
| Sodiumaverage · range 18.4 to 37 · listed as a violation in the report · Groundwater (city wells) · 2025 report, page 7 | 27 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), Uranium
What removes it: Reverse osmosis.
Industrial chemicals and pesticides
Found: Tetrachloroethylene (PCE)
What removes it: Carbon block or RO.
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