Norwalk First Taxing District
EPA ID: CT1030011 · 40,256 people served · 16 ZIP codes
Norwalk First Taxing District recorded 2 EPA violations over the past five years, all of which have since been resolved — the utility is currently in compliance serving 40,256 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Norwalk First Taxing District Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The Norwalk First Taxing District serves a community with a median household income of $174,538 and an estimated 157,882 residents across its service area. Approximately 76% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Norwalk First Taxing District's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Norwalk First Taxing District compares to EPA limits
What This Means For You
Stage 1 DBP Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Contaminant 0700 at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 40 detections recorded. 12 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Comparable Water Systems
Similar-sized systems in Connecticut
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
NORWALK FIRST TAXING DISTRICT (EPA ID: CT1030011) is a community water system in Connecticut that serves approximately 40,256 people from surface water sources.
This system provides water to 16 ZIP codes across 4 communities.
Average Home Safety Score: C (58/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
| Contaminant 0700 | Other Violation | 1 | Yes |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 06850 | 0.003 mg/L | No | N/A |
| 06851 | 0.003 mg/L | No | N/A |
| 06852 | 0.003 mg/L | No | N/A |
| 06854 | 0.003 mg/L | No | N/A |
| 06855 | 0.003 mg/L | No | N/A |
| 06856 | 0.003 mg/L | No | N/A |
| 06857 | 0.003 mg/L | No | N/A |
| 06858 | 0.003 mg/L | No | N/A |
| 06859 | 0.003 mg/L | No | N/A |
| 06860 | 0.003 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 7 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 9 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 06840 — New Canaan
- 06850 — Norwalk
- 06851 — Norwalk
- 06852 — Norwalk
- 06853 — Norwalk
- 06854 — Norwalk
- 06855 — Norwalk
- 06856 — Norwalk
- 06857 — Norwalk
- 06858 — Norwalk
- 06859 — Norwalk
- 06860 — Norwalk
- 06880 — Westport
- 06881 — Westport
- 06889 — Westport
- 06897 — Wilton
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Norwalk First Taxing District (CT1030011) on EPA.gov.
Frequently Asked Questions
Is Norwalk First Taxing District water safe to drink?
Norwalk First Taxing District has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Norwalk First Taxing District serve?
Norwalk First Taxing District serves approximately 40,256 people across 16 ZIP codes in Connecticut.
Where does Norwalk First Taxing District get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Above Current MCL
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). One or more PFAS compounds were measured above the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Norwalk First Taxing District (EPA ID: CT1030011) — request the latest Consumer Confidence Report or ask about specific contaminants.