We read 11 results from Crescenta Valley CWD’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 35,841 people · Water system ID CA1910028 · 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 |
|---|---|---|---|---|
| Bromateaverage · range ND to 12 · listed as a violation in the report · Distribution system · 2025 report, page 5 | 3 ppb | 0.1 ppb | 10 ppb | Above the health goal30x the health goal |
| Chromium-6average · range ND to 1.9 · listed as a violation in the report · CVWD wells · 2025 report, page 6 | 0.53 ppb | 0.02 ppb | 10 ppb | Above the health goal27x the health goal |
| Copper90th percentile of 35 homes tested, 0 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 5 | 0.4 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.3x the health goal |
| Gross alpha (radioactivity)average · range ND to 7 · listed as a violation in the report · sampled 2020 · CVWD wells · 2025 report, page 7 | 3 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Uraniumaverage · range 2.98 to 17.9 · listed as a violation in the report · printed as 5 pCi/L · CVWD wells · 2025 report, page 7 | 7.45 ppb | 0.6 ppb | 30 ppb | Above the health goal12x the health goal |
| Chlorineaverage · range 0.1 to 2 · listed as a violation in the report · Distribution system · 2025 report, page 5 | 0.7 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 4 to 17 · listed as a violation in the report · Distribution system · 2025 report, page 5 | 16 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 43 to 63 · listed as a violation in the report · Distribution system · 2025 report, page 5 | 55 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.1 to 0.6 · listed as a violation in the report · CVWD wells · 2025 report, page 6 | 0.2 ppm | 1 ppm | 2 ppm | Below the health goal |
| Lead90th percentile of 35 homes tested, 0 over the action level · listed as a violation in the report · sampled 2023 · Customer taps · 2025 report, page 5 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)average · range ND to 6 · listed as a violation in the report · CVWD wells · 2025 report, page 7 | 4 ppm | 10 ppm | 10 ppm | Below the health goal |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 1 number we weren’t sure about is held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Crescenta Valley CWD’s water between Feb 2023 and Nov 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA5.1 pptFound in 3 of 16 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS4.9 pptFound in 6 of 16 samples · highest resultNo federal limit in force for this one
- PFBS6.8 pptFound in 9 of 16 samples · highest resultNo federal limit in force for this one
- Lithium45 ppbFound in 5 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.
Radium and uranium
Found: Gross alpha (radioactivity), Uranium
What removes it: Reverse osmosis.
PFAS ("forever chemicals")
Found: PFOA (EPA testing)
What removes it: Reverse osmosis.
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