Water Quality Report · Updated October 07, 2026
OXNARD WATER DEPT
OXNARD WATER DEPT delivers tap water graded D (63/100) by TapWaterSafety.org. The utility serves approximately 200,232 residents in OXNARD, California using surface water (purchased). The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. For questions, the utility can be reached at 805-385-8111.
Is OXNARD tap water safe to drink?
OXNARD WATER DEPT delivers tap water that earns a grade of D (63/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including haloacetic acids (haa5) significantly above health guideline.
The utility serves 200,232 residents in OXNARD, drawing from surface water (purchased).
Public testing data identifies 15 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA5), Arsenic, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Dibromoacetic acid, Dibromochloromethane, Bromodichloromethane, Bromoform, Nitrate, Nitrate and nitrite, Chromium (hexavalent), Uranium, Bromate, Chloroform, Dichloroacetic acid. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
EPA compliance record
Official U.S. EPA records for OXNARD WATER DEPT (system ID CA5610007) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for OXNARD residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for OXNARD WATER DEPT.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.38 ppb, 344x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 12.0 ppb, 199x above the EWG health guideline of 0.06 ppb.
Contact OXNARD WATER DEPT
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for OXNARD
Filters matched to the specific contaminants in this water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 63/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Arsenic Heavy metal |
1.38 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 344× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
12.0 ppb | 0.06 | — | — | — | — | — | 199× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
23.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 158× over |
| Dibromoacetic acid Disinfection byproduct |
3.93 ppb | 0.03 | — | — | — | — | — | 131× over |
| Dibromochloromethane Disinfection byproduct |
8.34 ppb | 0.1 | — | — | — | — | — | 83× over |
| Bromodichloromethane Disinfection byproduct |
2.93 ppb | 0.06 | — | — | — | — | — | 49× over |
| Bromoform Disinfection byproduct |
11.4 ppb | 0.5 | — | — | — | — | — | 23× over |
| Nitrate Inorganic |
1.97 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 14× over |
| Nitrate and nitrite Inorganic |
1.81 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 13× over |
| Chromium (hexavalent) Heavy metal |
0.225 ppb | 0.02 | — | — | — | — | — | 11× over |
| Uranium Radiological |
4.07 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 9.5× over |
| Bromate Disinfection byproduct |
0.213 ppb | 0.1 | 10.0 | 10 | 10 | 0.1 | — | 2.1× over |
| Chloroform Disinfection byproduct |
0.808 ppb | 0.4 | — | — | — | — | — | 2.0× over |
| Dichloroacetic acid Disinfection byproduct |
0.219 ppb | 0.2 | — | — | — | — | — | 1.1× over |
| Trichloroacetic acid Disinfection byproduct |
0.0765 ppb | 0.1 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
8.01 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Molybdenum Other |
8.96 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
13.5 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Chlorate Disinfection byproduct |
16.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
1.48 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
36.1 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0133 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Chloromethane Other |
0.0441 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0543 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.858 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1-Butanol Other |
0.175 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.6 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
31.8 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
OXNARD WATER DEPT service area
This water system serves 1 community in Ventura County, California. Click any city for its dedicated tap water quality page.
Find the right filter for OXNARD water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.