Westminster, CA Water Safety: 94/100 (2026)
3 ZIP codes · 7 water systems · Updated 2026-06-03
Unlike many cities its size in CA, Westminster keeps health-based violation rates low — systems here score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.
How Westminster Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Westminster Water
- Average lead level: 0.0047 mg/L.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 10.23.
Who Supplies Your Water in Westminster
3 independent water providers serve Westminster, CA — 7 systems appear in federal records.
Overview
We track water quality and home safety data for 3 ZIP codes in Westminster, California (population ~90,140), covering 7 community water systems serving approximately 527,080 people region-wide.
No EPA violations recorded across any ZIP codes in Westminster — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Westminster: A (94/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Westminster water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0047 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 3 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 92683 | A | City of Westminster | 90,911 |
| 92684 | A | City of Westminster | 90,911 |
| 92685 | A | City of Westminster | 90,911 |
All ZIP Codes in Westminster
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Westminster
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Cost Context: What Remediation Means for Westminster Homeowners
Across Westminster, the equity share taken up by estimated remediation is small — a favorable ratio for most property owners.
Remediation costs in Westminster are relatively low compared to home values. The $1,200–$2,600 estimated range is a small fraction of median property value. Home values are 11% above the California average.
Lead Exposure Risk for Children in Westminster
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Westminster appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Westminster
Within the NFIP's national dataset, Westminster falls in moderate-exposure territory — 176 documented incidents spanning multiple decades, with 33% of local ZIP codes sitting inside FEMA flood boundaries. That combination warrants inclusion in any thorough local water quality review.
Westminster has a moderate flood history with 176 FEMA claims averaging $2,813 per payout. 33% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,800</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Westminster, CA