Ctwc - Columbia Heights Div.
EPA ID: CT0300011 · 32 people served · 1 ZIP code
The five-year EPA compliance file for Ctwc - Columbia Heights Div. contains 2 violations, each documented and subsequently closed — the utility now operates in full compliance and continues to supply approximately 32 residents with water meeting current federal standards, including both health-based and monitoring requirements.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Ctwc - Columbia Heights Div. Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Ctwc - Columbia Heights Div. serves a community with a median household income of $122,500 and an estimated 5,268 residents across its service area. Approximately 58% 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 - Columbia Heights Div.'s water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How Ctwc - Columbia Heights Div. compares to EPA limits
What This Means For You
Surface Water Treatment Rule at 2 mg/L exceeds the EPA maximum of mg/L.
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 - Columbia Heights Div. (EPA ID: CT0300011) is a community water system in Connecticut that serves approximately 32 people from groundwater sources.
This system serves ZIP code 06237 in Columbia.
Average Home Safety Score: B (77/100)
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 |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Failure | 2 | 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 |
|---|---|---|---|
| 06237 | 0.0013 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate 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
- 06237 — Columbia
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Ctwc - Columbia Heights Div. (CT0300011) on EPA.gov.
Frequently Asked Questions
Is Ctwc - Columbia Heights Div. water safe to drink?
Ctwc - Columbia Heights Div. has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does Ctwc - Columbia Heights Div. serve?
Ctwc - Columbia Heights Div. serves approximately 32 people across 1 ZIP code in Connecticut.
Where does Ctwc - Columbia Heights Div. get its water?
The primary water source is groundwater.
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 - Columbia Heights Div. (EPA ID: CT0300011) — request the latest Consumer Confidence Report or ask about specific contaminants.