Your Local Water Profile: Ojai
This profile explains what the applicable water provider reported for Ojai, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
Water provider: Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS)
Public water system CA5610014 · 2025 report · Current 2025 monitoring cycle
View the 2025 Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS) Consumer Confidence ReportWhat the official water report says
Your water at a glance
Casitas Municipal Water District
The report lists hardness as 412 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.
Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS) — compliance, as reported
The report states: “Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS), strives to meet, or exceed, all USEPA and state standards for safe water. [p. 1]”
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
Hardness - Total as CaCO3
The utility reported: 412 ppm
ADDITIONAL CONSTITUENTS · report p. 5 · official report
pH
The utility reported: 7.2 pH standard units
ADDITIONAL CONSTITUENTS · report p. 5 · official report
Alkalinity - Total as CaCO3
The utility reported: 230 ppm
ADDITIONAL CONSTITUENTS · report p. 5 · official report
Total Dissolved Solids
The utility reported: 630 ppm
SECONDARY AESTHETIC STANDARDS · report p. 5 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
LEAD AND COPPER · report p. 4 · official report
Chlorine as Cl2
The utility reported: 1.3 ppm
DISINFECTANT RESIDUALS AND DISINFECTION BY-PRODUCTS · report p. 4 · official report
Corrosivity (Langlier Index)
The utility reported: 0.2 Langlier Index
ADDITIONAL CONSTITUENTS · report p. 5 · 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.
Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS) — regulated contaminants reported as detected (13)
Combined Filter Effluent Turbidity
The utility reported: 0.31 NTU
Reported range: 0.01 - 0.31
TT: TT < 1 · Health goal (PHG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Soil run-off
WATER CLARITY · report p. 3 · official report
Barium
The utility reported: 0.1 ppm
Reported range: NA
Legal limit (MCL): 1 · Health goal (PHG): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Discharges of oil drilling wastes and from metal refineries; erosion of natural deposits
INORGANIC CHEMICALS · report p. 3 · official report
Chromium, Hexavalent
The utility reported: 0.02 ppb
Reported range: ND - 0.5
Legal limit (MCL): 10 · Health goal (PHG): 0.02 — not an enforceable limit
Violation per report: No
Typical source, per the report: Discharge from steel, pulp mills and chrome plating. Erosion of natural deposits
INORGANIC CHEMICALS · report p. 3 · official report
Fluoride
The utility reported: 0.3 ppm
Reported range: NA
Legal limit (MCL): 2 · Health goal (PHG): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
INORGANIC CHEMICALS · report p. 3 · official report
Nitrate as N
The utility reported: 4.9 ppm
Reported range: 2.9 - 6.4
Legal limit (MCL): 10 · Health goal (PHG): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff and leaching from fertilizer use; leaching from tanks and sewage; erosion from natural deposits
INORGANIC CHEMICALS · report p. 3 · official report
Perchlorate
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - ND
Legal limit (MCL): 6 · Health goal (PHG): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Contamination from solid rocket propellant, fireworks, explosives, flares, matches and a variety of industries
INORGANIC CHEMICALS · report p. 3 · official report
Selenium
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: NA
Legal limit (MCL): 50 · Health goal (PHG): 30 — not an enforceable limit
Violation per report: No
Typical source, per the report: Discharge from petroleum, glass, and metal refineries; erosion of natural deposits; discharge from mines and chemical manufacturers; runoff from livestock lots (feed additive)
INORGANIC CHEMICALS · report p. 3 · official report
Gross Alpha Particle Activity
The utility reported: <3 pCi/L
Reported range: < 3 - 3.5
Legal limit (MCL): 15 · Health goal (MCLG): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposiits
RADIOLOGICAL · report p. 4 · official report
Chlorine as Cl2
The utility reported: 1.3 ppm
Reported range: 0.8 - 1.8
MRDL: 4.0 · Health goal (MRDLG): 4.0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant added for treatment
DISINFECTANT RESIDUALS AND DISINFECTION BY-PRODUCTS · report p. 4 · official report
Trihalomethanes
The utility reported: 10 ppb
Reported range: 0 - 13
Legal limit (MCL): 80 · Health goal (PHG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
DISINFECTANT RESIDUALS AND DISINFECTION BY-PRODUCTS · report p. 4 · official report
Haloacetic acids
The utility reported: 0 ppb
Reported range: 0 - 0
Legal limit (MCL): 60 · Health goal (PHG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
DISINFECTANT RESIDUALS AND DISINFECTION BY-PRODUCTS · report p. 4 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - ND
RAL: 15 · Health goal (PHG): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household plumbing systems; discharges from industrial manufacturers; erosion of natural products
LEAD AND COPPER · report p. 4 · official report
Copper
The utility reported: 0.4 ppm
Reported range: ND - 1.0
RAL: 1.3 · Health goal (PHG): 0.3 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
LEAD AND COPPER · report p. 4 · official report
Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS) — unregulated monitoring and secondary (aesthetic) records (6)
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.
Specific Conductance
The utility reported: 1050 µS/cm
Reported range: NA
Typical source, per the report: Substances that form ions in water; seawater influence
SECONDARY AESTHETIC STANDARDS · report p. 5 · official report
Boron
The utility reported: 130 ppb
Reported range: NA
Typical source, per the report: A naturally-occurring element
ADDITIONAL CONSTITUENTS · report p. 5 · official report
Potassium
The utility reported: 1 ppm
Reported range: NA
Typical source, per the report: A naturally-occurring element
ADDITIONAL CONSTITUENTS · report p. 5 · official report
Vanadium
The utility reported: 2 ppb
Reported range: NA
Typical source, per the report: A naturally-occurring element
ADDITIONAL CONSTITUENTS · report p. 5 · official report
Lithium
The utility reported: 35 ppb
Reported range: 34 - 37
Typical source, per the report: A naturally-occurring element
UNREGULATED CONTAMINANTS · report p. 5 · official report
29 Individual Per-and Polyfluoroalkyl Substances
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND
Typical source, per the report: Runoff / leaching from industrial processes , chemical factories, waste sites or sites using aqueous film-forming foam
UNREGULATED CONTAMINANTS · report p. 5 · official report
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
pH
The utility reported: 7.2 pH standard units
ADDITIONAL CONSTITUENTS · report p. 5 · official report
Alkalinity - Total as CaCO3
The utility reported: 230 ppm
ADDITIONAL CONSTITUENTS · report p. 5 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
LEAD AND COPPER · report p. 4 · official report
Gross Alpha Particle Activity
The utility reported: <3 pCi/L
Reported range: < 3 - 3.5
Typical source, per the report: Erosion of natural deposiits
RADIOLOGICAL · report p. 4 · 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 — Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS)
High Water Quality Standards · data year 2025 · Current 2025 monitoring cycle
View the 2025 Casitas Municipal Water District’s (CMWD) Ojai Water System (OWS) Consumer Confidence ReportSource water, per the report: Groundwater is pumped from the Ojai Valley Groundwater Basin through seven wells located in the town of Ojai. CMWD water is a blend of groundwater and surface water. The surface water comes from Lake Casitas. The groundwater is drawn from the Mira Monte Well.
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.
Ready for hot water?
Water Heaters Are All We Do
Same-day water heater service across Los Angeles, Orange & Ventura counties — with water-quality context that respects the evidence.
