CITY REPORT CT

Norwalk, CT: 27 Violations - Home Safety 56/100

11 ZIP codes · 4 water systems · Updated

ZipCheckup grade for Norwalk: C.

A mixed picture - some signals here are worth your attention.

The C shown for Norwalk, CT is an average of Home Safety Scores across the city's ZIP codes; that composite blends several data sources, so it can move for reasons unrelated to water, and it is not a measurement of what comes out of any tap in the city.

How Norwalk Compares

Norwalk56/100
Connecticut avg63/100
National avg73/100

Data: EPA SDWIS

11
ZIP Codes
4
Water Systems
5
ZIPs Linked to Systems with Violations
C · 56
Avg Safety Score
Zone 1
County Radon Potential (High)
$563K
Median Home Value
$600
Est. Remediation (0.1% of home value)

Water Quality Map: Norwalk, CT

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Score Distribution

Safety grade breakdown for Norwalk's 5 ZIP codes.

A
0
B
0
C
2
D
3
F
0

Key Facts for Norwalk Residents

  • Your city's water systems recorded 27 violations since 2021.
  • Average of reported 90th-percentile lead results: 0.0008 mg/L.
  • Estimated remediation: $600 per household.

Norwalk's Water Providers

Among 4 systems linked to Norwalk, CT, the 3 biggest by population served appear below.

Overview

We track home safety data for 11 ZIP codes in Norwalk, Connecticut (population ~91,375), covering 4 community water systems serving approximately 452,749 people region-wide. The EPA snapshots used for this build directly map water systems to 5 of 11 ZIP codes.

5 of 5 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.

Home Safety Score

Average Home Safety Score for Norwalk: C (56/100)

Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:

Factor What It Measures
Water Quality EPA violations and compliance history
PFAS MCL Screen UCMR 5 testing against the covered federal MCLs
Radon Risk EPA radon zone classification
Annual AQI EPA AirData county-year median with at least 90 observed days

Water Sources

Norwalk water systems draw from: Surface water.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0008 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 5 ZIP codes with known status exceed the EPA lead action level

Radon Risk

11 of 11 ZIP records with known zones are in EPA Radon Zone 1.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Top Contaminants

Contaminant Category Violations ZIPs Affected
Arsenic Inorganic 12 5
Barium Inorganic 12 5
Cadmium Inorganic 12 5
Chromium Inorganic 12 5
Cyanide Inorganic 12 5

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
06850 D 27 0 South Norwalk Electric & Water
06851 D 27 0 Norwalk First Taxing District
06854 C 27 0 South Norwalk Electric & Water
06855 D 27 0 Norwalk First Taxing District
06853 C 26 0 South Norwalk Electric & Water

All ZIP Codes in Norwalk

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

What's in Norwalk's Water?

Arsenic 12 violations
Inorganic · EPA regulatory level for the contaminant named above: 0.01 mg/L
Long-term exposure above the MCL: skin damage, circulatory problems, increased cancer risk
Barium 12 violations
Inorganic · EPA regulatory level for the contaminant named above: 2 mg/L
Increased blood pressure
Cadmium 12 violations
Inorganic · EPA regulatory level for the contaminant named above: 0.005 mg/L

Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.

How Remediation Costs Compare in Norwalk

Measured against the median home value, the estimated cost of fixing the issues flagged for Norwalk lands in the lowest of the three tiers this page uses.

Median Home Value
$562,900
Est. Remediation
$600
Remediation as % of home value 0.1%

Estimated remediation costs in Norwalk can be compared with local home values. The $400–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 38% above the Connecticut average.

Norwalk: Lead Risk & Vulnerable Populations

0.0008
mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

Available area-level lead records for Norwalk do not determine the lead level at an individual tap. 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: NFIP Claim Records and Water-Quality Context

1,973
Total FEMA Flood Claims
$28,658
Avg Reported Sum With Payment Data
71%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Norwalk contains 1,973 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $28,658. Among ZIP codes with claim records, 71% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.

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. The $600 remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.

Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.

Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.

What You Can Do in Norwalk

  1. Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
  2. Install a certified water filter. For Arsenic, listed in the water-quality records for Norwalk: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
  3. 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

Frequently Asked Questions

What does the Home Safety Score mean for Norwalk, CT?
Norwalk has an average Home Safety Score of 56/100 (Grade C) under ZipCheckup model 4.0.0, an area-level model that draws on EPA water compliance records, PFAS screening, EPA radon zones, and annual EPA air quality data; see the methodology page for how inputs and coverage are handled. 27 violations appear in EPA records for water systems mapped to these ZIP codes. Check individual ZIP code reports for component details.
How many violations are on record for water systems serving Norwalk?
EPA records list 27 EPA violations for Norwalk water systems. These water-system violations are shown for 11 mapped ZIP codes.
Does Norwalk water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Norwalk is 0.0008 mg/L. The EPA action level of 0.015 mg/L applies to each water system's own 90th percentile, not to this average. EPA's health goal for lead is zero. Lead levels can vary by home - testing is recommended especially in older properties.
How does Norwalk compare to Connecticut average?
Norwalk has an average Home Safety Score of 56/100, which is below the Connecticut state average of 63/100 for the same model series.
How many water systems serve Norwalk?
Our records map 4 water systems to 11 ZIP codes in Norwalk. The related population figure in our data is approximately 91,375 people; it is not a count of people served citywide.
How much does it cost to fix water issues in Norwalk?
Estimated remediation cost per household in Norwalk: $600; modeled range $400 to $800. Estimated costs may include filtration, pipe replacement, radon mitigation, or flood protection where applicable.
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How to cite this page

APA ZipCheckup. (2026). Norwalk, CT: 27 Violations - Home Safety 56/100. https://zipcheckup.com/cities/ct/norwalk/
BibTeX 
@misc{zipcheckup-cities-ct-norwalk,
  author = {{ZipCheckup}},
  title  = {{Norwalk, CT: 27 Violations - Home Safety 56/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/ct/norwalk/}
}

Page version: October 2026.

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