Concord, CA: 8 Health Violations — 78/100 (2026)
8 ZIP codes · 7 water systems · Updated 2026-06-03
The water systems supplying Concord show a track record of above-average compliance with federal standards — consistently among the better performers in CA.
How Concord Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Concord, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Concord score across all safety grades.
What You Should Know About Concord Water
- Your city's water systems recorded 32 violations in the past 5 years.
- Average lead level: 0.0031 mg/L.
- Estimated remediation: $1,600 per household.
- CDC health risk index: 11.19.
Who Supplies Your Water in Concord
Residential addresses in Concord, CA are served by 3 primary water providers out of 7 systems in federal records. Each system maintains separate infrastructure and files its own EPA compliance reports, so service conditions are not uniform across the city.
Overview
We track water quality and home safety data for 8 ZIP codes in Concord, California (population ~125,546), covering 7 community water systems serving approximately 285,033 people region-wide.
8 of 8 ZIP codes (100%) have recorded EPA violations. 8 health-based violations documented.
Home Safety Score
Average Home Safety Score for Concord: B (78/100)
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
Concord water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0031 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 7 ZIP codes
- Zone 3 (Low): 1 ZIP code
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Stage 1 DBP Rule | Treatment Technique | 18 | 8 |
| Stage 2 DBP Rule | Treatment Technique | 18 | 8 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 94518 | B | 4 | 1 | Contra Costa Water District |
| 94519 | B | 4 | 1 | Contra Costa Water District |
| 94520 | B | 4 | 1 | Contra Costa Water District |
| 94521 | B | 4 | 1 | Contra Costa Water District |
| 94522 | A | 4 | 1 | Contra Costa Water District |
| 94524 | B | 4 | 1 | Contra Costa Water District |
| 94527 | B | 4 | 1 | Contra Costa Water District |
| 94529 | B | 4 | 1 | Contra Costa Water District |
All ZIP Codes in Concord
- 94518 [B] — 4 violations ⚠
- 94519 [B] — 4 violations ⚠
- 94520 [B] — 4 violations ⚠
- 94521 [B] — 4 violations ⚠
- 94522 [A] — 4 violations ⚠
- 94524 [B] — 4 violations ⚠
- 94527 [B] — 4 violations ⚠
- 94529 [B] — 4 violations ⚠
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 Concord
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
Top Contaminants in Concord Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Cost Context: What Remediation Means for Concord Homeowners
Placing remediation in the context of Concord's property market, the equity share is low — most homeowners here are weighing a financial commitment that fits comfortably within routine property planning, far from the threshold where remediation becomes a material equity decision rather than a standard upkeep consideration.
Remediation costs in Concord are relatively low compared to home values. The $750–$2,750 estimated range is a small fraction of median property value. Home values are 11% above the California average.
Lead Exposure Risk for Children in Concord
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 Concord 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 Concord
Flood exposure in Concord is meaningful by NFIP measures — 71 claims on record and 63% of ZIP codes carrying FEMA flood zone designations. That level of activity makes flood history a relevant factor when evaluating local water quality over time.
Concord has a moderate flood history with 71 FEMA claims averaging $1,564 per payout. 63% 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>$1,600</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 Concord, CA