We read 25 results from Oxnard Water Dept’s 2025 water quality report. No results over a legal limit; 8 above a health goal or guideline.
Serves about 200,232 people · Water system ID CA5610007 · 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 0.63 to 0.74 · Blended system · 2025 report, page 8 | 0.74 ppb | 0.004 ppb | 10 ppb | Above the health goal185x the health goal |
| Copper90th percentile of 50 homes tested, 1 over the action level · printed as 790 ppb · sampled 2024 · Customer taps (50 sites) · 2025 report, page 9 | 0.79 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal2.6x the health goal |
| Gross alpha (radioactivity)average · range 1.58 to 3.71 · Blended system · 2025 report, page 9 | 2.79 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Gross beta (radioactivity)average · range 3.9 to 5.76 · Blended system · 2025 report, page 9 | 4.89 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of 50 homes tested, 3 over the action level · sampled 2024 · Customer taps (50 sites) · 2025 report, page 9 | 5.5 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal28x the health goal |
| Sulfateaverage · range 64 to 600 · Blended system · 2025 report, page 8 | 338 ppm | — | 250 ppm guideline | Above the guideline1.4x the guideline (taste, odor or stains; not a health limit) |
| Total dissolved solidsaverage · range 260 to 1,000 · Blended system · 2025 report, page 8 | 782 ppm | — | 500 ppm guideline | Above the guideline1.6x the guideline (taste, odor or stains; not a health limit) |
| Uraniumaverage · range 5.36 to 6.71 · printed as 4.15 pCi/L · Blended system · 2025 report, page 9 | 6.18 ppb | 0.6 ppb | 30 ppb | Above the health goal10x the health goal |
| Chlorideaverage · range 51 to 67 · Blended system · 2025 report, page 8 | 56 ppm | — | 250 ppm guideline | Within the guideline |
| Chlorineaverage · range 0.06 to 3 · Distribution system · 2025 report, page 9 | 1.51 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 1.6 to 7.3 · Distribution system · 2025 report, page 9 | 3.7 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 9.5 to 36 · Distribution system · 2025 report, page 9 | 22.2 ppb | None set | 80 ppb | Below the legal limit |
| Ironaverage · range ND to 0.44 · Blended system · 2025 report, page 8 | 0.09 ppm | — | 0.3 ppm guideline | Within the guideline |
| Nitrate (as N)average · range 0.44 to 7 · Blended system · 2025 report, page 8 | 1.88 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)average · range 0.43 to 0.86 · Blended system (UCMR 5) · 2025 report, page 9 | 0.69 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| pHaverage · range 6.24 to 8.2 · Blended system · 2025 report, page 8 | 7.5 | — | — | Normal range |
| Seleniumaverage · range 3.6 to 4.44 · Blended system · 2025 report, page 8 | 3.98 ppb | 30 ppb | 50 ppb | Below the health goal |
| Total coliform bacteriahighest month · Distribution system · 2025 report, page 8 | Not detected | 0 % positive | 5 % positive | Not detected |
| Turbidity (cloudiness)highest measured · Calleguas MWD Lake Bard plant · 2025 report, page 8 | 0.16 NTU | None set | 1 NTU | Below the legal limit |
| Alkalinityaverage · range 110 to 300 · Blended system · 2025 report, page 8 | 183 ppm | None set | None | No health limit |
| Boronaverage · range 0.53 to 0.55 · printed as 535 ppb · Source water before blending · 2025 report, page 8 | 0.54 ppm | None set | None | No health limit |
| Calciumaverage · range 30.5 to 233 · Blended system · 2025 report, page 8 | 104 ppm | None set | None | No health limit |
| Hardnessaverage · range 7.66 to 54.4 · Blended system · 2025 report, page 8 | 24.5 gpg (419 ppm) | — | — | Very hard |
| Magnesiumaverage · range 13.2 to 84.3 · Blended system · 2025 report, page 8 | 37.3 ppm | None set | None | No health limit |
| Sodiumaverage · range 77 to 87 · Blended system · 2025 report, page 8 | 81 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 Oxnard Water Dept’s water between Mar 2023 and Dec 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium39 ppbFound in 12 of 12 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.
Lead
Found: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Radium and uranium
Found: Gross alpha (radioactivity), Gross beta (radioactivity), Uranium
What removes it: Reverse osmosis.
Salty taste / high TDS
Found: Sulfate, Total dissolved solids
What removes it: Reverse osmosis.
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