Ctwc - Shoreline Region-masons Island
EPA ID: CT1370051 · 445 people served · 4 ZIP codes
Federal water data for Ctwc - Shoreline Region-masons Island logs 1 historical violation — all addressed and cleared, leaving the utility in current compliance for 445 people.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Ctwc - Shoreline Region-masons Island Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Ctwc - Shoreline Region-masons Island serves a community with a median household income of $126,014 and an estimated 26,634 residents across its service area. Approximately 70% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Ctwc - Shoreline Region-masons Island'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 60th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Ctwc - Shoreline Region-masons Island compares to EPA limits
What This Means For You
Stage 1 DBP Rule 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. 9 detections recorded. 2 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
CTWC - SHORELINE REGION-MASONS ISLAND (EPA ID: CT1370051) is a community water system in Connecticut that serves approximately 445 people from surface water sources.
This system provides water to 4 ZIP codes across 4 communities.
Average Home Safety Score: D (50/100)
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 |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 06378 | 0.0015 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: 2 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 2 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.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Ctwc - Shoreline Region-masons Island (CT1370051) on EPA.gov.
Frequently Asked Questions
Is Ctwc - Shoreline Region-masons Island water safe to drink?
Ctwc - Shoreline Region-masons Island has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does Ctwc - Shoreline Region-masons Island serve?
Ctwc - Shoreline Region-masons Island serves approximately 445 people across 4 ZIP codes in Connecticut.
Where does Ctwc - Shoreline Region-masons Island get its water?
The primary water source is surface water.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
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.
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
Ctwc - Shoreline Region-masons Island (EPA ID: CT1370051) — request the latest Consumer Confidence Report or ask about specific contaminants.