Norwalk, CA Water Safety: 73/100 (2026)
4 ZIP codes · 5 water systems · Updated 2026-06-03
Water systems serving Norwalk hold a strong EPA compliance record — the city places among the better-performing areas in CA with few health-based violations on file.
How Norwalk Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Norwalk Residents
- Estimated remediation: $850 per household.
- CDC health risk index: 10.71.
Norwalk's Water Providers
Water service in Norwalk, CA is split across 3 utilities out of 5 tracked federally, each operating its own infrastructure and compliance record.
Overview
We track water quality and home safety data for 4 ZIP codes in Norwalk, California (population ~100,808), covering 5 community water systems serving approximately 268,417 people region-wide.
No EPA violations recorded across any ZIP codes in Norwalk — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Norwalk: B (73/100)
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
Norwalk water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Norwalk
- 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): 4 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 90650 | B | Norwalk - City, Water Department | 20,283 |
| 90651 | B | Norwalk - City, Water Department | 20,283 |
| 90652 | B | Norwalk - City, Water Department | 20,283 |
| 90659 | B | Norwalk - City, Water Department | 20,283 |
All ZIP Codes in Norwalk
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.
Norwalk Community Health Snapshot
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
How Remediation Costs Compare in Norwalk
Within the Norwalk market, estimated remediation claims a small portion of typical property equity — the financial burden is proportionally low.
Remediation costs in Norwalk are relatively low compared to home values. The $300–$1,450 estimated range is a small fraction of median property value. Home values are 17% below the California average.
Norwalk: Flood History & Water Damage Risk
A moderate NFIP record for Norwalk — 6 insurance claims paired with 25% of ZIP codes in FEMA flood zones — points to a flood history where water-quality pathways have likely been periodically relevant.
Norwalk has a moderate flood history with 6 FEMA claims averaging $2,659 per payout. 25% 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>$850</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 Norwalk, CA