We read 14 results from Walnut Creek SUD’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 30,364 people · Water system ID TX1840008 · 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 |
|---|---|---|---|---|
| Arsenichighest measured · range 1.2 to 1.2 · Treated water · 2025 report, page 7 | 1.2 ppb | 0.004 ppb | 10 ppb | Above the health goal300x the health goal |
| Gross beta (radioactivity)highest measured · range 6.3 to 6.3 · sampled 2023 · Treated water · 2025 report, page 7 | 6.3 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 5 | 1.2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal6x the health goal |
| Bariumhighest measured · range 0.08 to 0.08 · Treated water · 2025 report, page 7 | 0.08 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloramineaverage · range 0.2 to 4.4 · Distribution system · 2025 report, page 5 | 2.98 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 5 | 0.05 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Cyanidehighest measured · range 39.4 to 39.4 · Treated water · 2025 report, page 7 | 39.4 ppb | 150 ppb | 200 ppb | Below the health goal |
| DEHP (a phthalate)highest measured · range ND to 0.5 · Treated water · 2025 report, page 7 | 0.5 ppb | 12 ppb | 6 ppb | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 34 to 34 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 33 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 75.6 to 75.6 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 63 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.16 to 0.16 · Treated water · 2025 report, page 7 | 0.16 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range 0.32 to 0.32 · Treated water · 2025 report, page 7 | 0.32 ppm | 10 ppm | 10 ppm | Below the health goal |
| Turbidity (cloudiness)highest measured · listed as a violation in the report · Walnut Creek SWTP · 2025 report, page 7 | 1 NTU | None set | 1 NTU | Below the legal limit |
| Dibromochloromethanehighest measured · range 6.09 to 17.4 · Treated water · 2025 report, page 7 | 17.4 ppb | 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 beta (radioactivity)
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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