Norwalk, CT: 11 Health Violations — 61/100 (2026)
11 ZIP codes · 5 water systems · Updated 2026-06-03
Across Norwalk, EPA compliance data for CT sits at a moderate level — not alarming, but not uniformly clean across all service areas either.
How Norwalk Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Norwalk, CT
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Safety grade breakdown for Norwalk's 11 ZIP codes.
Key Facts for Norwalk Residents
- Your city's water systems recorded 22 violations in the past 5 years.
- Average lead level: 0.003 mg/L.
- Estimated remediation: $1,791 per household.
Norwalk's Water Providers
Water delivery in Norwalk, CT is handled by 3 utilities rather than a single system — drawn from 5 providers in federal records, each filing its own compliance reports and setting its own rates.
Overview
We track water quality and home safety data for 11 ZIP codes in Norwalk, Connecticut (population ~91,375), covering 5 community water systems serving approximately 452,849 people region-wide.
11 of 11 ZIP codes (100%) have recorded EPA violations. 11 health-based violations documented.
Home Safety Score
Average Home Safety Score for Norwalk: C (61/100)
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: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0030 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 11 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
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 | 12 | 11 |
| Contaminant 0700 | Other | 12 | 11 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 06850 | C | 2 | 1 | Norwalk First Taxing District |
| 06851 | C | 2 | 1 | Norwalk First Taxing District |
| 06852 | C | 2 | 1 | Norwalk First Taxing District |
| 06853 | D | 2 | 1 | AQUARION-EASTERN FAIRFIELD COUNTY |
| 06854 | D | 2 | 1 | Norwalk First Taxing District |
| 06855 | D | 2 | 1 | Norwalk First Taxing District |
| 06856 | C | 2 | 1 | Norwalk First Taxing District |
| 06857 | C | 2 | 1 | Norwalk First Taxing District |
| 06858 | C | 2 | 1 | Norwalk First Taxing District |
| 06859 | C | 2 | 1 | Norwalk First Taxing District |
All ZIP Codes in Norwalk
- 06850 [C] — 2 violations ⚠
- 06851 [C] — 2 violations ⚠
- 06852 [C] — 2 violations ⚠
- 06853 [D] — 2 violations ⚠
- 06854 [D] — 2 violations ⚠
- 06855 [D] — 2 violations ⚠
- 06856 [C] — 2 violations ⚠
- 06857 [C] — 2 violations ⚠
- 06858 [C] — 2 violations ⚠
- 06859 [C] — 2 violations ⚠
- 06860 [C] — 2 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.
What's in Norwalk's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Remediation Costs Compare in Norwalk
At current valuations, Norwalk sits in the low remediation-share tier — the equity impact of fixing documented issues is proportionally minor.
Remediation costs in Norwalk are relatively low compared to home values. The $877–$2,955 estimated range is a small fraction of median property value. Home values are 38% above the Connecticut average.
Norwalk: Lead Risk & Vulnerable Populations
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 Norwalk 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.
Norwalk: Flood History & Water Damage Risk
Flood exposure in Norwalk is substantial — 1973 NFIP claims on record and 64% of ZIP codes within FEMA-designated zones. That volume of documented flood activity places water-quality implications of flooding firmly in the active-risk category rather than the hypothetical.
Norwalk has a significant flood history with 1,973 FEMA flood insurance claims on record, averaging $16,269 per claim. With 64% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.
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>$1,791</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.
What You Can Do in Norwalk
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Stage 1 DBP Rule can reduce the most common contaminant found in Norwalk's water.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Norwalk, CT