We read 32 results from Pico WD’s 2025 water quality report. No results over a legal limit; 10 above a health goal or guideline.
Serves about 22,051 people · Water system ID CA1910125 · 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 1.8 · Groundwater wells · 2025 report, page 6 | 1.4 ppb | 0.004 ppb | 10 ppb | Above the health goal350x the health goal |
| Chromium-6average · range 0.53 to 0.74 · Groundwater wells · 2025 report, page 6 | 0.7 ppb | 0.02 ppb | 10 ppb | Above the health goal35x the health goal |
| Gross alpha (radioactivity)average · range 0.57 to 3.47 · Groundwater wells · 2025 report, page 6 | 2.54 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Gross beta (radioactivity)average · Groundwater wells · 2025 report, page 6 | 3.58 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 · Customer taps · 2025 report, page 6 | 0.84 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal4.2x the health goal |
| PFOA (a PFAS)average · range ND to 22 · Groundwater wells · 2025 report, page 7 | 9.7 ppt | 0.007 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20292.4x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| PFOS (a PFAS)average · range ND to 56 · Groundwater wells · 2025 report, page 7 | 20.3 ppt | 1 ppt | 4 ppt from 2029 | Above the federal limit that takes effect in 20295.1x the 4 ppt federal limit that takes effect in 2029Not a violation yet: EPA's 4 ppt limit is final, but water systems don't have to meet it until 2029. |
| Radium-228average · range ND to 1.9 · Groundwater wells · 2025 report, page 6 | 0.19 pCi/L | 0.02 pCi/L | 5 pCi/L | Above the health goal10x the health goal |
| Tetrachloroethylene (PCE)average · range ND to 1.6 · Groundwater wells · 2025 report, page 6 | 0.7 ppb | 0.06 ppb | 5 ppb | Above the health goal12x the health goal |
| Uraniumaverage · range ND to 2.68 · printed as 0.99 pCi/L · Groundwater wells · 2025 report, page 6 | 1.48 ppb | 0.6 ppb | 30 ppb | Above the health goal2.5x the health goal |
| Bariumaverage · range ND to 0.1 · Groundwater wells · 2025 report, page 6 | 0.1 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorideaverage · range 42 to 94 · Groundwater wells · 2025 report, page 6 | 62.1 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.13 to 1.28 · Distribution system · 2025 report, page 6 | 0.96 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · Distribution system · 2025 report, page 6 | 0.6 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · Distribution system · 2025 report, page 6 | 8.4 ppb | None set | 80 ppb | Below the legal limit |
| Fluorideaverage · range 0.2 to 0.31 · Groundwater wells · 2025 report, page 6 | 0.2 ppm | 1 ppm | 2 ppm | Below the health goal |
| Nitrate (as N)average · range 1.5 to 3.7 · Groundwater wells · 2025 report, page 6 | 2.6 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)average · range ND to 6 · Groundwater wells · 2025 report, page 7 | 3.1 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| Sulfateaverage · range 62 to 140 · Groundwater wells · 2025 report, page 6 | 88.9 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · range 300 to 570 · Groundwater wells · 2025 report, page 6 | 398 ppm | — | 500 ppm guideline | Within the guideline |
| Trichloroethylene (TCE)average · range ND to 0.55 · Groundwater wells · 2025 report, page 6 | 0.08 ppb | 1.7 ppb | 5 ppb | Below the health goal |
| Turbidity (cloudiness)average · range ND to 0.55 · Distribution system · 2025 report, page 6 | 0.12 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 110 to 210 · Groundwater wells · 2025 report, page 7 | 163 ppm | None set | None | No health limit |
| Calciumaverage · range 44.7 to 108 · Groundwater wells · 2025 report, page 7 | 74.8 ppm | None set | None | No health limit |
| Conductivityaverage · range 460 to 920 · Groundwater wells · 2025 report, page 6 | 638 µS/cm | None set | None | No health limit |
| Hardnessaverage · range 8.6 to 19.9 · Groundwater wells · 2025 report, page 7 | 14.9 gpg (255 ppm) | — | — | Very hard |
| Magnesiumaverage · range 8.6 to 17.2 · Groundwater wells · 2025 report, page 7 | 13.6 ppm | None set | None | No health limit |
| PFBS (a PFAS)average · range ND to 11 · Groundwater wells · 2025 report, page 7 | 5.4 ppt | None set | None | No health limit |
| PFHpA (a PFAS)average · range ND to 6.1 · Groundwater wells · 2025 report, page 7 | 2.3 ppt | None set | None | No health limit |
| PFHxA (a PFAS)average · range ND to 11 · Groundwater wells · 2025 report, page 7 | 5.4 ppt | None set | None | No health limit |
| Potassiumaverage · range 3.6 to 4.7 · Groundwater wells · 2025 report, page 7 | 4.3 ppm | None set | None | No health limit |
| Sodiumaverage · range 37 to 50 · Groundwater wells · 2025 report, page 7 | 46.8 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. 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 Pico WD’s water between Sep 2023 and May 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA14 pptFound in 8 of 8 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFOS28 pptFound in 8 of 8 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFHxS5.7 pptFound in 5 of 8 samples · highest resultNo federal limit in force for this one
- PFBS7.3 pptFound in 8 of 8 samples · highest resultNo federal limit in force for this one
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.
Radium and uranium
Found: Gross alpha (radioactivity), Gross beta (radioactivity), Radium-228, Uranium
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOS (a PFAS), PFOA (EPA testing), PFOS (EPA testing)
What removes it: Reverse osmosis.
Industrial chemicals and pesticides
Found: Tetrachloroethylene (PCE)
What removes it: Carbon block or RO.
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