Your Local Water Profile: Westminster
This profile explains what the applicable water provider reported for Westminster, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
Water provider: City of Westminster Water Division
Public water system CA3010064 · 2025 report · Current 2025 monitoring cycle
View the 2025 City of Westminster Water Division Consumer Confidence ReportWhat the official water report says
Your water at a glance
City of Westminster
The report lists hardness as 251 ppm as CaCO3; this is not classified because the reported unit could not be normalized 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 Westminster Water Division — compliance, as reported
The report states: “The City of Westminster Water Division vigilantly safeguards its water supply, and as in years past, the water delivered to your home meets the quality standards required by federal and state regulatory agencies.”
Violations or advisories, as reported: The report includes a Nitrate Advisory: Nitrate in drinking water at levels above 10 ppm is a health risk for infants of less than six months of age. No MCL violations were reported.
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
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 Westminster Water Division — regulated contaminants reported as detected (14)
Color
The utility reported: ND - 1 color units
Legal limit (MCL): 15
Typical source, per the report: Erosion of Natural Deposits
Aesthetic Quality · official report
Odor
The utility reported: 0.1 - 1 threshold odor number
Legal limit (MCL): 3
Typical source, per the report: Erosion of Natural Deposits
Aesthetic Quality · official report
Turbidity
The utility reported: ND - 1 ntu
Legal limit (MCL): 5
Typical source, per the report: Erosion of Natural Deposits
Aesthetic Quality · official report
Haloacetic Acids
The utility reported: Not detected at the report's stated reporting limit ppb
Legal limit (MCL): 60
Typical source, per the report: Byproducts of Chlorine Disinfection
Disinfection Byproducts · official report
Total Trihalomethanes
The utility reported: ND - 2.3 ppb
Legal limit (MCL): 80
Typical source, per the report: Byproducts of Chlorine Disinfection
Disinfection Byproducts · official report
Copper
The utility reported: ND - 0.21 ppm
Legal limit (MCL): 1.3 · Health goal (goal): 0.3 — not an enforceable limit
Typical source, per the report: Corrosion of Household Plumbing
Lead and Copper · official report
Lead
The utility reported: ND - 7.9 ppb
Legal limit (MCL): 15 · Health goal (goal): 0.2 — not an enforceable limit
Typical source, per the report: Corrosion of Household Plumbing
Lead and Copper · official report
Uranium
The utility reported: 2.13 - 10.4 pCi/L
Legal limit (MCL): 20 · Health goal (goal): 0.43 — not an enforceable limit
Typical source, per the report: Erosion of Natural Deposits
Radiologicals · official report
Arsenic
The utility reported: ND - 2.4 ppb
Legal limit (MCL): 10 · Health goal (goal): 0.004 — not an enforceable limit
Typical source, per the report: Runoff or Leaching from Natural Deposits
Inorganic Chemicals · official report
Fluoride
The utility reported: 0.39 - 0.51 ppm
Legal limit (MCL): 2 · Health goal (goal): 1 — not an enforceable limit
Typical source, per the report: Runoff or Leaching from Natural Deposits
Inorganic Chemicals · official report
Hexavalent Chromium
The utility reported: 0.11 - 2.15 ppb
Legal limit (MCL): 10 · Health goal (goal): 0.02 — not an enforceable limit
Typical source, per the report: Erosion of Natural Deposits; Industrial Discharge
Inorganic Chemicals · official report
Nitrate
The utility reported: ND - 5.53 ppm as N
Legal limit (MCL): 10 · Health goal (goal): 10 — not an enforceable limit
Typical source, per the report: Agriculture Runoff and Sewage
Inorganic Chemicals · official report
Nitrate+Nitrite
The utility reported: ND - 5.53 ppm as N
Legal limit (MCL): 10 · Health goal (goal): 10 — not an enforceable limit
Typical source, per the report: Agriculture Runoff and Sewage
Inorganic Chemicals · official report
Perchlorate
The utility reported: ND - 4.1 ppb
Legal limit (MCL): 6 · Health goal (goal): 1 — not an enforceable limit
Typical source, per the report: Industrial Discharge
Inorganic Chemicals · official report
City of Westminster Water Division — unregulated monitoring and secondary (aesthetic) records (14)
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: 11.3 - 74 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Secondary Standards · official report
Sulfate
The utility reported: 34.5 - 141 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Secondary Standards · official report
Total Dissolved Solids
The utility reported: 234 - 566 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Secondary Standards · official report
Alkalinity, total
The utility reported: 155 - 206 ppm as CaCO3
Typical source, per the report: Runoff or Leaching from Natural Deposits
Unregulated Constituents · official report
Lithium
The utility reported: ND - 9.2 ppb
Typical source, per the report: Various Natural and Man-made Sources
Unregulated Constituents · official report
Magnesium
The utility reported: 7.8 - 19.7 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Unregulated Constituents · official report
Perfluoro Hexane Sulfonic Acid
The utility reported: ND - 5 ppt
Typical source, per the report: Industrial Discharge
Unregulated Constituents · official report
Perfluoro Octane Sulfonic Acid
The utility reported: ND - 6.5 ppt
Typical source, per the report: Industrial Discharge
Unregulated Constituents · official report
Perfluoro Octane Sulfonic Acid
The utility reported: ND - 5.3 ppt
Typical source, per the report: Industrial Discharge
Unregulated Constituents · official report
Perfluoroctanoic Acid
The utility reported: ND - 4.1 ppt
Typical source, per the report: Industrial Discharge
Unregulated Constituents · official report
Perfluoroctanoic Acid
The utility reported: ND - 4 ppt
Typical source, per the report: Industrial Discharge
Unregulated Constituents · official report
pH
The utility reported: 7.9 - 8.1 pH units
Typical source, per the report: Hydrogen Ion Concentration
Unregulated Constituents · official report
Potassium
The utility reported: 2.1 - 4.1 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Unregulated Constituents · official report
Sodium
The utility reported: 31.8 - 49.8 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Unregulated Constituents · official report
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
Copper
The utility reported: ND - 0.21 ppm
Typical source, per the report: Corrosion of Household Plumbing
Lead and Copper · official report
Lead
The utility reported: ND - 7.9 ppb
Typical source, per the report: Corrosion of Household Plumbing
Lead and Copper · official report
Chloride
The utility reported: 11.3 - 74 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Secondary Standards · official report
Sulfate
The utility reported: 34.5 - 141 ppm
Typical source, per the report: Runoff or Leaching from Natural Deposits
Secondary Standards · official report
Alkalinity, total
The utility reported: 155 - 206 ppm as CaCO3
Typical source, per the report: Runoff or Leaching from Natural Deposits
Unregulated Constituents · official report
pH
The utility reported: 7.9 - 8.1 pH units
Typical source, per the report: Hydrogen Ion Concentration
Unregulated Constituents · 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 Westminster Water Division
2025 City of Westminster Water Division Drinking Water Quality · data year 2025 · Current 2025 monitoring cycle
View the 2025 City of Westminster Water Division Consumer Confidence ReportSource water, per the report: The City of Westminster’s water supply is a blend of groundwater managed by the OCWD and water imported from Northern California and the Colorado River. On average, 85 percent of drinking water is produced from groundwater wells and 15 percent is imported, but for 2025, Westminster pumped 100 percent groundwater.
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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