Danbury, CT: 6 Health Violations — 65/100 (2026)
6 ZIP codes · 7 water systems · Updated 2026-06-03
Danbury's water quality grade in CT reflects a middle-ground assessment — service areas range from fully compliant to violation-flagged in current EPA records.
How Danbury Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Danbury, CT
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
Safety grade breakdown for Danbury's 6 ZIP codes.
Key Facts for Danbury Residents
- Your city's water systems recorded 54 violations in the past 5 years.
- Average lead level: 0.0011 mg/L.
- Estimated remediation: $2,617 per household.
Danbury's Water Providers
Federal drinking water records identify 7 systems in Danbury, CT. The leading 3 providers serve the largest share of residential connections, each operating as a separate entity with its own rate authority, infrastructure management, and EPA compliance obligations — so service conditions are not uniform city-wide.
Overview
We track water quality and home safety data for 6 ZIP codes in Danbury, Connecticut, covering 7 community water systems serving approximately 85,705 people.
6 of 6 ZIP codes (100%) have recorded EPA violations. 6 health-based violations documented.
Home Safety Score
Average Home Safety Score for Danbury: C (65/100)
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
Danbury water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0011 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): 6 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 |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Technique | 21 | 6 |
| Contaminant 1919 | Other | 7 | 6 |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 7 | 6 |
| Contaminant 2998 | Other | 7 | 6 |
| Total Coliform | Microbiological | 7 | 6 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 06810 | C | 9 | 1 | Danbury Water Department |
| 06811 | C | 9 | 1 | Danbury Water Department |
| 06813 | C | 9 | 1 | Danbury Water Department |
| 06814 | C | 9 | 1 | Danbury Water Department |
| 06816 | C | 9 | 1 | Danbury Water Department |
| 06817 | C | 9 | 1 | Danbury Water Department |
All ZIP Codes in Danbury
- 06810 [C] — 9 violations ⚠
- 06811 [C] — 9 violations ⚠
- 06813 [C] — 9 violations ⚠
- 06814 [C] — 9 violations ⚠
- 06816 [C] — 9 violations ⚠
- 06817 [C] — 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.
What's in Danbury's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Remediation Costs Compare in Danbury
Setting Danbury remediation figures against its property market, the resulting ratio sits comfortably in the low tier — a classification that reflects the kind of household financial position where most homeowners can identify documented issues, schedule the work, and absorb the cost without it registering as a significant budget disruption.
Remediation costs in Danbury are relatively low compared to home values. The $1,717–$3,750 estimated range is a small fraction of median property value. Home values are 1% below the Connecticut average.
Danbury: 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 Danbury 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.
Danbury: Flood History & Water Damage Risk
Multiple flood events have been recorded for Danbury through the NFIP — 234 claims in total, with 50% of ZIP codes in FEMA-designated zones — pointing to a flood exposure profile that merits inclusion in a water quality assessment without reaching high-severity planning territory.
Danbury has a moderate flood history with 234 FEMA claims averaging $37,754 per payout. 50% 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>$2,617</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 Danbury
- 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 Surface Water Treatment Rule can reduce the most common contaminant found in Danbury'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 Danbury, CT