# Oxnard, CA — Drinking Water Quality (2024)

> Contaminant levels for the Oxnard, CA public water system from its 2024 Consumer Confidence Report, compared to federal limits.

- Page: https://www.thewatermap.com/water/ca/oxnard/2024
- JSON API: https://www.thewatermap.com/api/water/ca/oxnard/2024
- Source: the utility's annual Consumer Confidence Report (CCR)
- Verification: transcribed by a model, cross-checked by a second model, approved before publishing
- Reporting year: 2024
- Contaminants measured: 33
- Contaminants with a federal limit: 26
- Contaminants at or above the federal limit: 4
- Part of The Water Map — https://www.thewatermap.com

## Contaminants measured

| Contaminant | Category | Measured level | Sampling context | Federal limit | Status |
|---|---|---|---|---|---|
| Chlorine | Disinfectants | 1.59 mg/L (Running annual avg) | Greatest LRAA | 4 mg/L (MCL) | Within the limit |
| Bromate | Disinfection byproducts | 3.1 ug/L (Running annual avg) | Greatest LRAA | 10 ug/L (MCL) | Within the limit |
| HAA5 | Disinfection byproducts | 4.58 ug/L (Running annual avg) | Greatest LRAA | 60 ug/L (MCL) | Within the limit |
| TTHM | Disinfection byproducts | 20.87 ug/L (Running annual avg) | Greatest LRAA | 80 ug/L (MCL) | Within the limit |
| Chloride | Inorganic chemicals | 48.75 mg/L (Average) | System-wide | 500 mg/L (MCL) | Within the limit |
| Fluoride | Inorganic chemicals | 0.43 mg/L (Average) | System-wide | 2 mg/L (MCL) | Within the limit |
| Nitrate | Inorganic chemicals | 1.48 mg/L (Average) | System-wide | 10 mg/L (MCL) | Within the limit |
| Sulfate | Inorganic chemicals | 318.62 mg/L (Average) | System-wide | 500 mg/L (MCL) | Within the limit |
| Arsenic | Metals | 1.04 ug/L (Average) | System-wide | 10 ug/L (MCL) | Within the limit |
| Boron | Metals | 462.5 ug/L (Average) | System-wide | 1 ug/L (NL) | At or above the limit |
| Calcium | Metals | 91.45 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Copper | Metals | 790 ug/L (Running annual avg) | Greatest LRAA | 1 ug/L (Action level) | At or above the limit |
| Iron | Metals | 74.98 ug/L (Average) | System-wide | 300 ug/L (MCL) | Within the limit |
| Lead | Metals | 5.5 ug/L (Running annual avg) | Greatest LRAA | 15 ug/L (Action level) | Within the limit |
| Magnesium | Metals | 32.4 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Potassium | Metals | 4.05 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Selenium | Metals | 3.3 ug/L (Average) | System-wide | 50 ug/L (MCL) | Within the limit |
| Sodium | Metals | 71 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Total Coliform | Microbial | 0 (Range) | System-wide | 0 (Public health goal) | None detected |
| Hexafluoropropylene oxide dimer acid | PFAS ("forever chemicals") | Not detected (Average) | System-wide | 10 (Public health goal) | None detected |
| Perfluorohexanesulfonic acid | PFAS ("forever chemicals") | Not detected (Range) | System-wide | 10 (Public health goal) | None detected |
| Perfluorononanoic acid | PFAS ("forever chemicals") | Not detected (Range) | System-wide | 10 (Public health goal) | None detected |
| PFOA | PFAS ("forever chemicals") | Not detected (Average) | System-wide | 0.007 (Public health goal) | None detected |
| PFOS | PFAS ("forever chemicals") | Not detected (Range) | System-wide | 1 (Public health goal) | None detected |
| Alkalinity | Physical & aggregate | 180 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| Hardness | Physical & aggregate | 356.75 mg/L (Average) | System-wide | No federal limit | Detected — no federal limit |
| pH | Physical & aggregate | 7.62 (Average) | System-wide | No federal limit | Detected — no federal limit |
| Specific Conductance | Physical & aggregate | 918 (Average) | System-wide | 1 (MCL) | At or above the limit |
| Total Dissolved Solids | Physical & aggregate | 680 mg/L (Average) | System-wide | 1 mg/L (MCL) | At or above the limit |
| Turbidity | Physical & aggregate | 0.075 NTU (Average) | System-wide | 5 NTU (MCL) | Within the limit |
| Gross Alpha | Radionuclides | 2.39 pCi/L (Average) | System-wide | 15 pCi/L (MCL) | Within the limit |
| Gross Beta Particle Activity | Radionuclides | 3.89 pCi/L (Average) | System-wide | 50 pCi/L (MCL) | Within the limit |
| Uranium | Radionuclides | 3.67 pCi/L (Average) | System-wide | 20 pCi/L (MCL) | Within the limit |

## What these contaminants are

- **Chlorine** — A disinfectant added to drinking water to kill bacteria and viruses. Effective and necessary, but high residual levels can cause taste and odor issues; the EPA caps the residual disinfectant level.
- **Bromate** — A disinfection byproduct formed when bromide-containing water is treated with ozone. Classified as a probable human carcinogen; the EPA sets a strict maximum contaminant level.
- **HAA5** — Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
- **TTHM** — Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
- **Chloride** — A naturally occurring salt compound. Regulated only as a secondary (cosmetic) standard; high levels cause a salty taste and can corrode pipes.
- **Fluoride** — A mineral often added to drinking water to help prevent tooth decay. Beneficial at low levels, but long-term exposure above the federal limit can cause bone disease and tooth mottling.
- **Nitrate** — A compound from fertilizer runoff, septic systems, and erosion of natural deposits. Levels above the federal limit can cause 'blue baby syndrome,' a serious oxygen-transport condition in infants.
- **Sulfate** — A naturally occurring mineral from rock and soil. No health-based federal limit; high levels can have a laxative effect and a bitter taste.
- **Arsenic** — A naturally occurring element that also enters water from industry and agriculture. A known human carcinogen; long-term exposure is linked to skin, bladder, and lung cancer.
- **Boron** — A naturally occurring element from rock and soil. No enforceable federal limit; the EPA has issued a health advisory level.
- **Calcium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **Copper** — A metal that enters water from corroding household plumbing. Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
- **Iron** — A naturally occurring metal common in groundwater. Regulated only as a secondary (cosmetic) standard; causes rusty color, staining, and metallic taste.
- **Lead** — A toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
- **Magnesium** — A naturally occurring mineral that contributes to water hardness. Not federally regulated for health; affects scaling and taste.
- **Potassium** — A naturally occurring mineral from rock and soil. Not federally regulated for health.
- **Selenium** — A trace element from natural deposits and industrial discharge. Essential in tiny amounts, but long-term exposure above the federal limit can cause hair and fingernail loss and circulatory problems.
- **Sodium** — A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
- **Total Coliform** — A group of bacteria used as an indicator of overall water-system sanitation. Coliforms themselves are usually harmless, but their presence signals that disease-causing organisms could enter the system.
- **Hexafluoropropylene oxide dimer acid** — HFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
- **Perfluorohexanesulfonic acid** — Perfluorohexanesulfonic acid, a PFAS 'forever chemical.' Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
- **Perfluorononanoic acid** — Perfluorononanoic acid, a PFAS 'forever chemical.' Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
- **PFOA** — Perfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
- **PFOS** — Perfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
- **Alkalinity** — A measure of the water's capacity to neutralize acids. Not federally regulated for health; relevant to corrosion control and treatment.
- **Hardness** — A measure of dissolved calcium and magnesium minerals. Not federally regulated for health; affects scaling, soap use, and taste.
- **pH** — A measure of how acidic or basic the water is. Regulated only as a secondary standard; very low or high pH can corrode pipes or affect taste.
- **Specific Conductance** — A measure of how well water conducts electricity, which tracks dissolved mineral content. Not federally regulated for health; used as a proxy for total dissolved solids.
- **Total Dissolved Solids** — Total dissolved solids — the combined content of all dissolved minerals and salts. Regulated only as a secondary (cosmetic) standard; high levels affect taste and hardness.
- **Turbidity** — A measure of cloudiness from suspended particles in the water. High turbidity can shelter microbes from disinfection; the EPA enforces it through a treatment-technique standard.
- **Gross Alpha** — Gross alpha particle activity — a combined measure of alpha-emitting radioactive substances. Long-term exposure above the federal limit increases cancer risk.
- **Gross Beta Particle Activity** — Gross beta particle activity — a combined measure of beta-emitting radioactive substances. Long-term exposure above the federal screening level increases cancer risk.
- **Uranium** — A naturally occurring radioactive metal from erosion of natural deposits. Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.

## How to read this

- A water-quality report covers an entire service area, not a single address.
- 'Federal limit' is the EPA standard (MCL, action level, treatment technique, etc.) that the measured level is compared against.
- 'At or above the federal limit' means the utility's own reported figure met or exceeded that standard.

_Figures are the utility's own published numbers. Generated 2026-05-25 from thewatermap.com._