Drinking water quality · 2024
· Verified
What's in Oxnard, CA tap water
33 contaminants were measured in the Oxnard, CA water system's 2024 annual report. Each is shown below against its federal limit — 4 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 33
- Over federal limit
- 4
- Approaching the limit
- 0
- Worst contaminant
- Specific Conductance
- Service area
- CA
- Specific ConductancePhysical & aggregate · Average918limit 1 · 918.0× the limit
- CopperMetals · Running annual avg790 ug/Llimit 1 ug/L · 790.0× the limit
- Total Dissolved SolidsPhysical & aggregate · Average680 mg/Llimit 1 mg/L · 680.0× the limit
- BoronMetals · Average462.5 ug/Llimit 1 ug/L · 462.5× the limit
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Oxnard, CA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
Lithium
● Detected (no federal limit)near national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Oxnard, CA's drinking water comes from ground water, drawn from 9 sources.
Source
- WELL · 7
- WELLS 32, 33 & 34 BLENDED RAW
- WELL 22
Treatment
- WELL 28 - TRT CL
- BS#3 - NITRATE BLEND - TREATED
- WELL 29 - TRT CL
- + 9 more
Distribution
Also buys water from CALLEGUAS MUNICIPAL WATER DIST, UNITED WTR CONS DIST.
Historical readings · EPA Six-Year Review (2012–2019)
5 contaminants historically over EPA limits in Oxnard, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
GROSS BETA worst: 2016 | 35 mrem/yr 8.8× | 4 mrem/yr | '12'13'14'16'17'18'19 |
SELENIUM worst: 2019 | 0.089 mg/L 1.8× | 0.05 mg/L | '13'14'16'17'18'19 |
NITRATE worst: 2014 | 17.6 mg/L 1.8× | 10 mg/L | '12'13'14'15'16'17'18'19 |
DEHP worst: 2019 | 0.0088 mg/L 1.5× | 0.006 mg/L | '19 |
NITRATE NITRITE worst: 2016 | 13 mg/L 1.3× | 10 mg/L | '13'16'17'18'19 |
EDB worst: 2018 | 0.000044 mg/L 88% | 0.00005 mg/L | '18 |
ARSENIC worst: 2019 | 0.0065 mg/L within below national p90 | 0.01 mg/L | '13'16'19 |
TTHM worst: 2015 | 0.052 mg/L within | 0.08 mg/L | '12'13'15'16'17'18'19 |
FLUORIDE worst: 2016 | 1.3 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2013 | 0.014 mg/L within | 0.06 mg/L | '12'13'15'16'17'18'19 |
DICHLOROMETHANE worst: 2014 | 0.00056 mg/L within | 0.005 mg/L | '14 |
URANIUM worst: 2016 | 0.0268 ug/L within above national p90 | 30 ug/L | '14'16'17'18'19 |
COPPER worst: 2012 | 0.0064 mg/L below national p90 | — | '12 |
DBAA worst: 2012 | 0.0051 mg/L | — | '12'13'15'16'17'18'19 |
DCAA worst: 2012 | 0.0014 mg/L | — | '12'13'15'16'17'18'19 |
MBAA worst: 2012 | 0.0027 mg/L | — | '12'13'17 |
MCAA worst: 2012 | 0.0036 mg/L | — | '12'13 |
TCAA worst: 2012 | 0.0013 mg/L | — | '12'15'18 |
BROMODICHLOROMETHANE worst: 2012 | 0.0035 mg/L | — | '12'13'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.013 mg/L | — | '12'13'15'16'17'18'19 |
CHLOROFORM worst: 2015 | 0.0062 mg/L | — | '15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0098 mg/L | — | '12'13'15'16'17'18'19 |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 918AverageSystem-wide | 1MCL | At or above the limit |
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 680 mg/LAverageSystem-wide | 1 mg/LMCL | At or above the limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 0.075 NTUAverageSystem-wide | 5 NTUMCL | Within the limit |
| AlkalinityA measure of the water's capacity to neutralize acids. | 180 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 356.75 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 7.62AverageSystem-wide | None set | Detected — no federal limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BoronA naturally occurring element from rock and soil. | 462.5 ug/LAverageSystem-wide | 1 ug/LNL | At or above the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 5.5 ug/LRunning annual avgGreatest LRAA | 15 ug/LAction level | Within the limit |
| IronA naturally occurring metal common in groundwater. | 74.98 ug/LAverageSystem-wide | 300 ug/LMCL | Within the limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 91.45 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| MagnesiumA naturally occurring mineral that contributes to water hardness. | 32.4 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 4.05 mg/LAverageSystem-wide | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 71 mg/LAverageSystem-wide | None set | Detected — no federal limit |
Inorganic chemicals
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 1.59 mg/LRunning annual avgGreatest LRAA | 4 mg/LMCL | Within the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 3.1 ug/LRunning annual avgGreatest LRAA | 10 ug/LMCL | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 2.39 pCi/LAverageSystem-wide | 15 pCi/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0RangeSystem-wide | 0Public health goal | None detected |
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | Not detectedAverageSystem-wide | 10Public health goal | None detected |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | Not detectedRangeSystem-wide | 10Public health goal | None detected |
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | Not detectedRangeSystem-wide | 10Public health goal | None detected |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | Not detectedAverageSystem-wide | 0.007Public health goal | None detected |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | Not detectedRangeSystem-wide | 1Public health goal | None detected |
People also ask about Oxnard, CA's water
+Is Oxnard, CA tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Oxnard, CA water utility lists 4 contaminants at or above the federal limit: Specific Conductance, Copper, Total Dissolved Solids, and Boron. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Oxnard, CA tap water?
33 contaminants were measured in Oxnard, CA's 2024 Consumer Confidence Report, spanning metals, physical & aggregate, and pfas ("forever chemicals"). 26 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Oxnard, CA tap water?
4 contaminants in Oxnard, CA's 2024 report sit at or above the federal limit: Specific Conductance (918.0× the limit); Copper (790.0× the limit); Total Dissolved Solids (680.0× the limit); Boron (462.5× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Oxnard, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Specific Conductance, at 918.0× the federal threshold. It belongs to the physical & aggregate family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Oxnard, CA's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Oxnard, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.