We read 6 results from Walnut Valley Water District’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 100,941 people · Water system ID CA1910234 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
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 2024 · Customer taps · 2025 report, page 13 | 0.74 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal2.5x the health goal |
| Chlorineaverage · range 1.8 to 2.4 · Distribution system · 2025 report, page 13 | 2.11 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 2.1 to 45 · Distribution system · 2025 report, page 13 | 29.3 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 15 to 62 · Distribution system · 2025 report, page 13 | 40.1 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 30 homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 13 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Turbidity (cloudiness)average · range ND to 0.55 · Distribution system · 2025 report, page 13 | 0.1 NTU | None set | 1 NTU | Below the legal 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 Walnut Valley Water District’s water between Mar 2024 and Nov 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium50.1 ppbFound in 5 of 8 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.
More districts: California water quality · All states · Something look wrong? Tell us