Your Local Water Profile: Newbury Park
This profile explains what the applicable water provider reported for Newbury Park, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
Newbury Park — a community within Thousand Oaks.
Water provider: California American Water - Thousand Oaks
Public water system CA5610040 · 2025 report · Current 2025 monitoring cycle
View the 2025 California American Water - Thousand Oaks Consumer Confidence ReportWhat the official water report says
Your water at a glance
California American Water Company
The report lists hardness as 140 mg/L; this is 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.
California American Water - Thousand Oaks — compliance, as reported
The report states: “We are pleased to report that in 2025, your water met state and federal drinking water requirements. [p. 2]”
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
Total Hardness (as CaCO3)
The utility reported: 140 mg/L
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Calcium
The utility reported: 31 - 34 ppm
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Magnesium
The utility reported: 13 - 14 ppm
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Alkalinity
The utility reported: 96 - 100 ppm
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Total Dissolved Solids
The utility reported: 297 ppm
SECONDARY REGULATED SUBSTANCES · report p. 8 · official report
Lead 90th Percentile
The utility reported: 3.0 ppb
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Copper 90th Percentile
The utility reported: 0.132 ppm
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Chloramines
The utility reported: 2.4 ppm
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 5 · official report
Chlorine
The utility reported: 1.61 ppm
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 5 · official report
Corrosivity (k)
The utility reported: 12.2
OTHER SUBSTANCES OF INTEREST · report p. 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.
California American Water - Thousand Oaks — regulated contaminants reported as detected (12)
Lead
The utility reported: 3.0 ppb
Reported range: ND to 5.0
AL: 15 · Health goal (MCLG): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing systems.
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Copper
The utility reported: 0.132 ppm
Reported range: ND to 0.263
AL: 1.3 · Health goal (MCLG): 1.3 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing systems.
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Total Coliform
The utility reported: 1.01% %
TT: Less than 5% · Health goal (MCLG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Naturally present in the environment
REVISED TOTAL COLIFORM RULE · report p. 4 · official report
Turbidity
The utility reported: 0.06 NTU
Reported range: 100%
TT: % of samples <=0.3 NTU · Health goal (MCLG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Soil runoff
TURBIDITY · report p. 4 · official report
Total Organic Carbon
The utility reported: 2.3 ppm
Reported range: 1.9 - 2.4
TT: TT · Health goal (MCLG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Naturally present in the environment
TREATMENT BYPRODUCTS PRECURSOR REMOVAL · report p. 4 · official report
Haloacetic Acids
The utility reported: 5.4 ppb
Reported range: 1.0 - 5.8
Legal limit (MCL): 60 · Health goal (MCLG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection.
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 5 · official report
Total Trihalomethanes
The utility reported: 14 ppb
Reported range: 8.9 - 18
Legal limit (MCL): 80 · Health goal (MCLG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection.
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 5 · official report
Chloramines
The utility reported: 2.4 ppm
Reported range: 1.7 - 2.8
MRDL: 4 · Health goal (MRDLG): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water additive used to control microbes.
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 5 · official report
Chlorine
The utility reported: 1.61 ppm
Reported range: 1.3 - 2.01
MRDL: 4 · Health goal (MRDLG): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water additive used to control microbes.
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 5 · official report
Aluminum
The utility reported: 0.06 ppm
Reported range: ND - 0.079
Legal limit (MCL): 1.0 · Health goal (PHG): 0.6 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits.
PRIMARY REGULATED SUBSTANCES · report p. 6 · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.2 - 1.1
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 which promotes strong teeth; discharge from fertilizer and aluminum factories.
PRIMARY REGULATED SUBSTANCES · report p. 6 · official report
Uranium
The utility reported: 2.0 pCi/L
Reported range: 2 - 3
Legal limit (MCL): 20 · Health goal (PHG): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits.
PRIMARY REGULATED SUBSTANCES · report p. 7 · official report
California American Water - Thousand Oaks — unregulated monitoring and secondary (aesthetic) records (22)
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: 49 ppm
Reported range: 56 - 52
Typical source, per the report: Leaching from natural deposits
SECONDARY REGULATED SUBSTANCES · report p. 8 · official report
Color
The utility reported: 1 color units
Reported range: 1
Typical source, per the report: Naturally occurring organic materials
SECONDARY REGULATED SUBSTANCES · report p. 8 · official report
Specific Conductance
The utility reported: 504 mmhos/cm
Reported range: 503 - 504
Typical source, per the report: Substances that form ions when in water
SECONDARY REGULATED SUBSTANCES · report p. 8 · official report
Sulfate
The utility reported: 71 ppm
Reported range: 64 - 78
Typical source, per the report: Leaching from natural deposits
SECONDARY REGULATED SUBSTANCES · report p. 8 · official report
Total Dissolved Solids
The utility reported: 297 ppm
Reported range: 293 - 301
Typical source, per the report: Leaching from natural deposits
SECONDARY REGULATED SUBSTANCES · report p. 8 · official report
Alkalinity
The utility reported: 96 - 100 ppm
Typical source, per the report: Naturally occurring.
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Boron
The utility reported: 0.2 ppm
Typical source, per the report: Naturally occurring
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Corrosivity (k)
The utility reported: 12.2
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Calcium
The utility reported: 31 - 34 ppm
Typical source, per the report: Leaching from natural deposits
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Magnesium
The utility reported: 13 - 14 ppm
Typical source, per the report: Leaching from natural deposits
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
pH
The utility reported: 8.3 - 8.4
Typical source, per the report: pH is a measure of the acid/base properties of water.
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Potassium
The utility reported: 2.8 - 2.9 ppm
Typical source, per the report: Leaching from natural deposits
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Sodium
The utility reported: 46 - 50 ppm
Typical source, per the report: Erosion from naturally occurring deposits: Used in water softener regeneration.
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
N-Nitrosodimethylamine (NDMA)
The utility reported: 2.1 ppt
Typical source, per the report: Man made, used in industrial applications
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Total Hardness (as CaCO3)
The utility reported: 140 mg/L
Typical source, per the report: Naturally occurring.
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Perfluorooctanoic acid (PFOA)
The utility reported: 0.4 ppt
Reported range: ND to 1.0
UNREGULATED CHEMICALS · report p. 10 · official report
Perfluorooctanesulfonic acid (PFOS)
The utility reported: 0.7 ppt
Reported range: 0.6 to 0.7
UNREGULATED CHEMICALS · report p. 10 · official report
Perfluorobutanoic acid (PFBA)
The utility reported: 2.0 ppt
Reported range: 1.7 to 2.3
UNREGULATED CHEMICALS · report p. 10 · official report
Perfluoroheptanoic acid (PFHpA)
The utility reported: 0.2 ppt
Reported range: ND to 0.5
UNREGULATED CHEMICALS · report p. 10 · official report
Perfluorohexanoic acid (PFHxA)
The utility reported: 0.8 ppt
Reported range: 0.7 to 0.9
UNREGULATED CHEMICALS · report p. 10 · official report
Perfluoropentanoic acid (PFPeA)
The utility reported: 0.7 ppt
Reported range: 0.6 to 0.7
UNREGULATED CHEMICALS · report p. 10 · official report
Lithium
The utility reported: 16 ppb
Reported range: 15 to 18
Typical source, per the report: commercial uses
UNREGULATED CHEMICALS · report p. 10 · official report
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
Alkalinity
The utility reported: 96 - 100 ppm
OTHER SUBSTANCES OF INTEREST · report p. 8 · official report
Lead 90th Percentile
The utility reported: 3.0 ppb
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Copper 90th Percentile
The utility reported: 0.132 ppm
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Lead
The utility reported: 3.0 ppb
Reported range: ND to 5.0
Typical source, per the report: Corrosion of household plumbing systems.
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Copper
The utility reported: 0.132 ppm
Reported range: ND to 0.263
Typical source, per the report: Corrosion of household plumbing systems.
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · 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 — California American Water - Thousand Oaks
2025 Annual Water Quality Report Summary · data year 2025 · Current 2025 monitoring cycle
View the 2025 California American Water - Thousand Oaks Consumer Confidence ReportSource water, per the report: The Thousand Oaks/Newbury Park water system is served entirely by treated surface water purchased from the Calleguas Municipal Water District. The Calleguas Municipal Water District is an authorized wholesaler of treated surface water received from the Metropolitan Water District of Southern California’s (MWDSC) Jensen and Weymouth water treatment plants. The sources of the raw surface water are the Sacramento and Colorado Rivers.
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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