Your Local Water Profile: Oxnard
This profile explains what the applicable water provider reported for Oxnard, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
Water provider: City of Oxnard Water Division
Public water system CA5610007 · 2025 report · Current 2025 monitoring cycle
View the 2025 City of Oxnard Water Division Consumer Confidence ReportWhat the official water report says
Your water at a glance
City of Oxnard Water Division
The report lists hardness as 418.6 ppm; this is very hard on the USGS scale.
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
City of Oxnard Water Division — compliance, as reported
The report states: “Based on the 2025 monitoring program, Oxnard’s drinking water continued to meet all applicable federal and state primary drinking water standards.”
Violations or advisories, as reported: In 2024, the City’s water supply was tested for lead and copper. Lead and copper results remained below the regulatory Action Levels based on the 90th percentile calculation required by the Lead and Copper Rule, although a small number of individual samples exceeded the Action Level (1 site for Copper, 3 sites for Lead).
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
Hardness / Total Hardness
The utility reported: 418.6 ppm
Water System Data · report p. PAGE 8 · official report
Specific Conductance
The utility reported: 1,047.60 µS/cm
Water System Data · report p. PAGE 8 · official report
Total Dissolved Solids
The utility reported: 782.32 ppm
Water System Data · report p. PAGE 8 · official report
The Three C's — 2 of 3
Contaminants
What was reported, and what do the applicable standards mean?
Legal limit — maximum contaminant level (MCL)
The highest level legally allowed in public drinking water under the applicable rule. Do not use MCL as a generic label for goals, action levels, notification levels, or independent guidelines. It is different from a non-enforceable health goal.
California health goal — public health goal (PHG)
A non-enforceable health-protective target developed for standard-setting context. It is not the California legal limit.
Federal health goal — maximum contaminant level goal (MCLG)
A non-enforceable EPA public-health target used in setting standards. It is not the legal limit.
Legal disinfectant-residual limit — maximum residual disinfectant level (MRDL)
The highest level of a drinking-water disinfectant allowed under the applicable rule. It is not an MCL for a contaminant.
City of Oxnard Water Division — regulated contaminants reported as detected (17)
Turbidity (Combined Filter Effluent)
The utility reported: 0.06 NTU
Benchmark: TT = % of samples <0.3 NTU
Typical source, per the report: Soil runoff
Reported constituent · report p. PAGE 8 · official report
Turbidity (Combined Filter Effluent)
The utility reported: 0.16 NTU
Benchmark: TT = % of samples <0.3 NTU
Typical source, per the report: Soil runoff
Reported constituent · report p. PAGE 8 · official report
Turbidity (Highest Single Value)
The utility reported: 0.18 NTU
Benchmark: TT = % of samples <0.2 NTU
Typical source, per the report: Well corrosion, by-products and microscopic soil particles
Reported constituent · report p. PAGE 8 · official report
Arsenic
The utility reported: 0.69 ppb
Reported range: 0.63 - 0.74
Benchmark: 10 · Health goal (goal): 0.004 — not an enforceable limit
Typical source, per the report: Erosion of natural deposits, orchard runoff
Reported constituent · report p. PAGE 8 · official report
Fluoride
The utility reported: 0.66 ppm
Reported range: 0.73 - 1
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Typical source, per the report: Water additive that promotes strong teeth
Reported constituent · report p. PAGE 8 · official report
Nitrate (as N)
The utility reported: 1.88 ppm
Reported range: 0.44 - 7
Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit
Typical source, per the report: Runoff and leaching from fertilizer & sewage
Reported constituent · report p. PAGE 8 · official report
Selenium
The utility reported: 3.98 ppb
Reported range: 3.6 - 4.44
Benchmark: 50 · Health goal (goal): 30 — not an enforceable limit
Typical source, per the report: Erosion of natural deposits, discharge from refineries
Reported constituent · report p. PAGE 8 · official report
Total Coliform Bacteria
The utility reported: 0
Reported range: 0
Benchmark: <5% monthly samples positive · Health goal (goal): 0 — not an enforceable limit
Typical source, per the report: Naturally present in the environment
Reported constituent · report p. PAGE 8 · official report
Gross Alpha Particle Activity
The utility reported: 2.79 pCi/L
Reported range: 1.58 - 3.71
Benchmark: 15 · Health goal (goal): 0 — not an enforceable limit
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 9 · official report
Gross Beta Particle Activity
The utility reported: 4.89 pCi/L
Reported range: 3.9 - 5.76
Benchmark: 50 · Health goal (goal): 0 — not an enforceable limit
Typical source, per the report: Decay of natural and manmade deposits
Reported constituent · report p. PAGE 9 · official report
Uranium
The utility reported: 4.15 pCi/L
Reported range: 3.6 - 4.5
Benchmark: 20 · Health goal (goal): 0.43 — not an enforceable limit
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 9 · official report
Disinfectant Residual Total Chlorine as Residual
The utility reported: 1.51 ppm
Reported range: 0.06 - 3
Benchmark: 4 · Health goal (goal): 4 — not an enforceable limit
Typical source, per the report: Disinfectant added to control microbiological parameters
Reported constituent · report p. PAGE 9 · official report
Haloacetic Acids (HAA5)
The utility reported: 3.7 ppb
Reported range: 1.6 - 7.3
Benchmark: 60
Typical source, per the report: By-products of drinking water disinfection using chlorine
Reported constituent · report p. PAGE 9 · official report
Total Trihalomethanes TTHM
The utility reported: 22.17 ppb
Reported range: 9.5 - 36
Benchmark: 80
Typical source, per the report: By-products of drinking water disinfection using chlorine
Reported constituent · report p. PAGE 9 · official report
Metropolitan (Jensen Plant) Bromate
The utility reported: 4.1 ppb
Reported range: 1.4 - 6.7
Benchmark: 10 · Health goal (goal): 0.1 — not an enforceable limit
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. PAGE 9 · official report
Copper
The utility reported: 790 ppb
Benchmark: 1,300 · Health goal (goal): 790 — not an enforceable limit
Typical source, per the report: Erosion of natural materials and corrosion of household plumbing fixtures
Reported constituent · report p. PAGE 9 · official report
Lead
The utility reported: 5.5 ppb
Benchmark: 15 · Health goal (goal): 5.5 — not an enforceable limit
Typical source, per the report: Erosion of natural materials and corrosion of household plumbing fixtures
Reported constituent · report p. PAGE 9 · official report
City of Oxnard Water Division — unregulated monitoring and secondary (aesthetic) records (15)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Chloride
The utility reported: 56 ppm
Reported range: 51 - 67
Typical source, per the report: Runoff and leaching from natural deposits, seawater influence
Reported constituent · report p. PAGE 8 · official report
Iron
The utility reported: 0.09 ppm
Reported range: 0 - 0.44
Typical source, per the report: Leaching from natural deposits, industrial waste
Reported constituent · report p. PAGE 8 · official report
Specific Conductance
The utility reported: 1,047.60 µS/cm
Reported range: 500 - 1,200
Typical source, per the report: Substances that form ions when in water, seawater influence
Reported constituent · report p. PAGE 8 · official report
Sulfate
The utility reported: 337.92 ppm
Reported range: 64 - 600
Typical source, per the report: Runoff and leaching from natural deposits
Reported constituent · report p. PAGE 8 · official report
Total Dissolved Solids
The utility reported: 782.32 ppm
Reported range: 260 - 1,000
Typical source, per the report: Runoff and leaching from natural deposits
Reported constituent · report p. PAGE 8 · official report
Turbidity
The utility reported: 0.25 NTU
Reported range: 0.10 - 0.45
Typical source, per the report: Soil runoff
Reported constituent · report p. PAGE 8 · official report
Alkalinity
The utility reported: 182.8 ppm
Reported range: 110 - 300
Typical source, per the report: Erosion of natural material
Reported constituent · report p. PAGE 8 · official report
Calcium
The utility reported: 104.2 ppm
Reported range: 30.5 - 233
Typical source, per the report: Erosion of natural material
Reported constituent · report p. PAGE 8 · official report
Hardness / Total Hardness
The utility reported: 418.6 ppm
Reported range: 131 - 930
Typical source, per the report: Erosion of natural material
Reported constituent · report p. PAGE 8 · official report
Magnesium
The utility reported: 37.26 ppm
Reported range: 13.2 - 84.3
Typical source, per the report: Erosion of natural material
Reported constituent · report p. PAGE 8 · official report
pH
The utility reported: 7.5 pH units
Reported range: 6.24 - 8.2
Typical source, per the report: Erosion of natural material
Reported constituent · report p. PAGE 8 · official report
Potassium
The utility reported: 4.44 ppm
Reported range: 4.2 - 4.86
Typical source, per the report: Erosion of natural material
Reported constituent · report p. PAGE 8 · official report
Sodium
The utility reported: 81 ppm
Reported range: 77 - 87
Typical source, per the report: Erosion of natural material, seawater influence
Reported constituent · report p. PAGE 8 · official report
Boron
The utility reported: 535 ppb
Reported range: 530 - 550
Typical source, per the report: Naturally present in the environment
Reported constituent · report p. PAGE 8 · official report
Perfluorohexanesulfonic Acid (PFHxS)
The utility reported: 0.69 ppt
Reported range: 0.43 - 0.86
Typical source, per the report: Run-off from airports, military bases, and landfills
Reported constituent · report p. PAGE 9 · official report
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
Gross Alpha Particle Activity
The utility reported: 2.79 pCi/L
Reported range: 1.58 - 3.71
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 9 · official report
Disinfectant Residual Total Chlorine as Residual
The utility reported: 1.51 ppm
Reported range: 0.06 - 3
Typical source, per the report: Disinfectant added to control microbiological parameters
Reported constituent · report p. PAGE 9 · official report
Copper
The utility reported: 790 ppb
Typical source, per the report: Erosion of natural materials and corrosion of household plumbing fixtures
Reported constituent · report p. PAGE 9 · official report
Whole-Home Relevance
What this may mean throughout your home
Local conditions can be relevant to equipment and fixtures — actual effects depend on your property.
Water heater (tank and tankless)
- What the local report can tell us
- The report's hardness and mineral values above are the system-level inputs most relevant to scale and sediment where water is heated.
- What a homeowner may notice
- Hardness minerals can contribute to scale on heating surfaces, sediment in tanks, and more frequent flushing or descaling needs.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Dishwasher and washing machine
- What the local report can tell us
- Reported hardness and secondary (aesthetic) records are the relevant system-level context for spotting and residue.
- What a homeowner may notice
- Hard water can change soap behavior and may contribute to spotting on dishes and residue in laundry.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Pipes, fixtures, faucets, and supply lines
- What the local report can tell us
- The corrosion-related inputs above (such as pH) describe the water entering the property — not the condition of any specific plumbing.
- What a homeowner may notice
- Mineral deposits can appear on aerators and fixtures; corrosion outcomes depend on materials, age, and water conditions together.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Drinking and cooking water
- What the local report can tell us
- The contaminant records above show what the utility reported for the system and period, with each benchmark type labeled.
- What a homeowner may notice
- Taste, odor, or aesthetic preferences can be noticeable even when health-based standards are met.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Decision Pathways
Treatment pathways to evaluate
Treatment is a decision pathway, not a product conclusion — no equipment can be responsibly chosen from city-level data alone.
The evaluation sequence we follow, in order:
- 1Define the concern
- 2Verify utility-level and home-specific evidence
- 3Choose point of treatment
- 4Verify the exact certified reduction claim for the exact model
- 5Review tradeoffs and maintenance
Water filtration
- Objective it can address
- Specific substances or aesthetic conditions (taste, odor, chlorine character).
- Point of treatment
- Point of entry or point of use, depending on the objective.
- Limitations to verify
- A filter works only for the conditions and reduction claims its exact design and certification support — filtration does not soften water.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
Water softening
- Objective it can address
- Hardness minerals (calcium and magnesium) and the scale they can contribute to.
- Point of treatment
- Typically point of entry, confirmed by evaluation.
- Limitations to verify
- Softening primarily exchanges hardness minerals — it is not a universal contaminant-removal device.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
Reverse osmosis
- Objective it can address
- Specified dissolved substances at a dedicated outlet, commonly drinking and cooking water.
- Point of treatment
- Typically point of use.
- Limitations to verify
- Produces a reject-water stream and needs pressure and maintenance; verify the exact NSF/ANSI 58 reduction claims for the exact model. It is not automatically the best system for every home.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
When testing is the right next step
Use a certified laboratory when the concern is tap-specific, property-specific, or not resolved by the utility report.
When inspection is the right next step
Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Evidence You Can Check
Official reports, sources, and methodology
Official report — City of Oxnard Water Division
2026 DRINKING WATER CONSUMER CONFIDENCE REPORT CALENDAR YEAR 2025 · data year 2025 · Current 2025 monitoring cycle
View the 2025 City of Oxnard Water Division Consumer Confidence ReportSource water, per the report: Oxnard’s drinking water is a blend of sources. Water supplies include imported water from the Calleguas Municipal Water District (Calleguas) originating in Northern California via the State Water Project, regional groundwater purchased from the United Water Conservation District (United) from the Santa Clara River and Oxnard Plain groundwater aquifer, and water pumped from ten City groundwater wells.
Nearby community water profiles
Property-Specific Next Step
Request a Water Quality Evaluation
Request a water-heater and water-quality evaluation tailored to the property, equipment, and homeowner objective.
A property-specific evaluation confirms your goals, provider, tap conditions, plumbing, equipment, installation, and maintenance before any treatment recommendation — this profile alone is never used to prescribe equipment.
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