Stockton, CA: 120 Health Violations — 75/100 (2026)
20 ZIP codes · 11 water systems · Updated 2026-06-03
Compared to statewide averages in CA, Stockton scores well — health violations are below the norm and systems generally operate within federal standards.
How Stockton Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Stockton, CA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Stockton score across all safety grades.
What You Should Know About Stockton Water
- Your city's water systems recorded 180 violations in the past 5 years.
- Average lead level: 0.0028 mg/L.
- Estimated remediation: $2,245 per household.
- CDC health risk index: 11.38.
Who Supplies Your Water in Stockton
Structurally, Stockton, CA's water supply is divided. Federal data identifies 11 water systems in the area, with 3 providers serving the bulk of residential connections. These utilities operate independently, meaning rate-setting authority and EPA compliance accountability are distributed rather than centralized.
Overview
We track water quality and home safety data for 20 ZIP codes in Stockton, California (population ~388,283), covering 11 community water systems serving approximately 694,706 people region-wide.
20 of 20 ZIP codes (100%) have recorded EPA violations. 120 health-based violations documented.
Home Safety Score
Average Home Safety Score for Stockton: B (75/100)
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
Stockton water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0028 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): 20 ZIP codes
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 105 | 20 |
| Stage 2 DBP Rule | Treatment Technique | 42 | 20 |
| Lead | Inorganic | 21 | 20 |
| Stage 1 DBP Rule | Treatment Technique | 21 | 20 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 95201 | B | 9 | 6 | City of Stockton |
| 95202 | B | 9 | 6 | California Water Service - Stockton |
| 95203 | B | 9 | 6 | California Water Service - Stockton |
| 95204 | B | 9 | 6 | California Water Service - Stockton |
| 95205 | B | 9 | 6 | City of Stockton |
| 95206 | B | 9 | 6 | City of Stockton |
| 95207 | B | 9 | 6 | City of Stockton |
| 95208 | B | 9 | 6 | City of Stockton |
| 95209 | B | 9 | 6 | City of Stockton |
| 95210 | B | 9 | 6 | City of Stockton |
All ZIP Codes in Stockton
- 95201 [B] — 9 violations ⚠
- 95202 [B] — 9 violations ⚠
- 95203 [B] — 9 violations ⚠
- 95204 [B] — 9 violations ⚠
- 95205 [B] — 9 violations ⚠
- 95206 [B] — 9 violations ⚠
- 95207 [B] — 9 violations ⚠
- 95208 [B] — 9 violations ⚠
- 95209 [B] — 9 violations ⚠
- 95210 [B] — 9 violations ⚠
- 95211 [B] — 9 violations ⚠
- 95212 [B] — 9 violations ⚠
- 95213 [B] — 9 violations ⚠
- 95214 [B] — 9 violations ⚠
- 95215 [B] — 9 violations ⚠
- 95219 [B] — 9 violations ⚠
- 95267 [B] — 9 violations ⚠
- 95269 [B] — 9 violations ⚠
- 95296 [B] — 9 violations ⚠
- 95297 [B] — 9 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 Stockton
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 Stockton Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Cost Context: What Remediation Means for Stockton Homeowners
In Stockton, the equity impact of remediation is proportionally small — not the kind of financial commitment that rises to the level of a genuine planning constraint, but a minor share of what most properties here are worth.
Remediation costs in Stockton are relatively low compared to home values. The $1,150–$4,070 estimated range is a small fraction of median property value. Home values are 49% below the California average.
Lead Exposure Risk for Children in Stockton
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 Stockton 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 Stockton
Flood risk in Stockton occupies the middle ground: 152 NFIP claims and 60% of local ZIP codes within FEMA flood zones. At that level, the risk pathways connecting flooding to water quality — treatment system stress, well infiltration, distribution backflow — become relevant considerations during significant flood events, even if day-to-day water quality is unaffected by flood history.
Stockton has a moderate flood history with 152 FEMA claims averaging $24,573 per payout. 60% 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>$2,245</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 Stockton, CA