What was found in Oxnard's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 11700 µg/L 117% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 890000 µg/L — UNITED WTR CONS DIST · 0 people · 2019 | 7/13 | SYR4 |
| Nitrate | 9800 µg/L 98% of the EPA limit 10000 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 42262 µg/L — VINEYARD AVE ESTATES MWC · 1,200 people · 2019 | 9/13 | SYR4 |
| Fluoride | 700 µg/L 18% of the EPA limit 4000 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019 | 10/13 | SYR4 |
| Nitrite | 200 µg/L 20% of the EPA limit 1000 µg/L Highest in the city: UNITED WTR CONS DIST · 0 people · 2019 | 1/13 | SYR4 |
| Copper | 6.4 µg/L 0.5% of the EPA limit 1300 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 130 µg/L — CLOVERDALE MUTUAL WATER CO. · 455 people · 2019 | 5/13 | SYR4 |
| Barium | 70.66 µg/L 3.5% of the EPA limit 2000 µg/L Highest in the city: NAVALAIR MOBILE HOME PARK · 160 people · 2018 | 9/13 | SYR4 |
| Selenium | 46.4 µg/L 93% of the EPA limit 50 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 70.2 µg/L — VINEYARD AVE ESTATES MWC · 1,200 people · 2015 | 9/13 | SYR4 |
| TTHM | 36.65 µg/L 46% of the EPA limit 80 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 60.125 µg/L — CLOVERDALE MUTUAL WATER CO. · 455 people · 2019 | 13/13 | SYR4 |
| Bromoform | 19 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 51.425 µg/L — CLOVERDALE MUTUAL WATER CO. · 455 people · 2019 | 13/13 | SYR4 |
| Lithium | 39 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2023
Highest in the city: 44.4 µg/L — CHANNEL ISLANDS BEACH CSD · 4,560 people · 2024 | 2/13 | UCMR-5 |
| Gross Beta Particle Activity | 22.965 pCi/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019 | 1/13 | SYR4 |
| Combined Uranium | 22.946 µg/L 76% of the EPA limit 30 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019 | 8/13 | SYR4 |
| Dibromochloromethane | 12 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 18.07 µg/L — NAVALAIR MOBILE HOME PARK · 160 people · 2019 | 13/13 | SYR4 |
| Total Haloacetic Acids (HAA5) | 10.7 µg/L 18% of the EPA limit 60 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 15.31 µg/L — DEMPSEY ROAD MUTUAL WATER CO · 990 people · 2019 | 13/13 | SYR4 |
| Dibromoacetic Acid | 7.4 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 12.5 µg/L — CLOVERDALE MUTUAL WATER CO. · 455 people · 2019 | 13/13 | SYR4 |
| Lead | 11.6 µg/L 77% of the EPA limit 15 µg/L Highest in the city: CLOVERDALE MUTUAL WATER CO. · 455 people · 2019 | 5/13 | SYR4 |
| Bromodichloromethane | 5.2 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 10.7 µg/L — NAVALAIR MOBILE HOME PARK · 160 people · 2019 | 13/13 | SYR4 |
| Monochloroacetic Acid | 4.285 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 9 µg/L — DEMPSEY ROAD MUTUAL WATER CO · 990 people · 2019 | 5/13 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 8.8 µg/L 147% of the EPA limit, at the 95th percentile of samples — 6 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019 | 1/13 | SYR4 |
| Arsenic | 5.15 µg/L 52% of the EPA limit 10 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 6.95 µg/L — VINEYARD AVE ESTATES MWC · 1,200 people · 2015 | 5/13 | SYR4 |
| Chloroform | 4.7 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 6.12 µg/L — NAVALAIR MOBILE HOME PARK · 160 people · 2019 | 11/13 | SYR4 |
| Chromium | 4 µg/L 4% of the EPA limit 100 µg/L Highest in the city: SIESTA MOBILE HOME PARK · 160 people · 2019 | 6/13 | SYR4 |
| Dichloroacetic Acid | 2.635 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 4 µg/L — SIESTA MOBILE HOME PARK · 160 people · 2019 | 5/13 | SYR4 |
| Trichloroacetic Acid | 1.42 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 3 µg/L — UNITED WTR CONS DIST · 0 people · 2019 | 5/13 | SYR4 |
| Monobromoacetic Acid | 2.6 µg/L No EPA limit set Main supplier: OXNARD WATER DEPT · 200,232 people · 2019 | 8/13 | SYR4 |
| Dichloromethane | 0.5600 µg/L 11% of the EPA limit 5 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019
Highest in the city: 2.2 µg/L — SIESTA MOBILE HOME PARK · 160 people · 2017 | 2/13 | SYR4 |
| Cadmium | 1.2 µg/L 24% of the EPA limit 5 µg/L Highest in the city: UNITED WTR CONS DIST · 0 people · 2019 | 3/13 | SYR4 |
| Antimony, Total | 1 µg/L 17% of the EPA limit 6 µg/L Highest in the city: NAVALAIR MOBILE HOME PARK · 160 people · 2018 | 1/13 | SYR4 |
| Ethylene Dibromide | 0.0440 µg/L 88% of the EPA limit 0.0500 µg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2019 | 1/13 | SYR4 |
| Mercury | 0.0400 µg/L 2% of the EPA limit 2 µg/L Highest in the city: CLOVERDALE MUTUAL WATER CO. · 455 people · 2019 | 3/13 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: OXNARD WATER DEPT · 200,232 people · 2027 | 12/13 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Oxnard
| Supplier | Population served |
|---|---|
| OXNARD WATER DEPT | 200,232 |
| CHANNEL ISLANDS BEACH CSD | 4,560 |
| VINEYARD AVENUE ACRES MWC | 1,820 |
| GARDEN ACRES MUTUAL WATER CO | 1,335 |
| VINEYARD AVE ESTATES MWC | 1,200 |
| DEMPSEY ROAD MUTUAL WATER CO | 990 |
| NYELAND ACRES MUTUAL WATER CO | 975 |
| CLOVERDALE MUTUAL WATER CO. | 455 |
| STRICKLAND MUTUAL WATER COMPANY | 429 |
| CYPRESS MUTUAL WATER CO INC | 224 |
| NAVALAIR MOBILE HOME PARK | 160 |
| SIESTA MOBILE HOME PARK | 160 |
| UNITED WTR CONS DIST | 0 |
Frequently asked questions about Oxnard tap water
Is Oxnard tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Oxnard. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Oxnard?
13 public water suppliers report drinking-water monitoring for Oxnard, California to the EPA. Each is listed above with its population served.
What contaminants are in Oxnard's water?
The contaminants EPA monitoring detected in Oxnard include Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, Copper. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.