Metropolitan District Commission
EPA ID: CT0640011 · 390,887 people served · 58 ZIP codes
Based on the latest federal compliance data, Metropolitan District Commission has 13 violations that the EPA has not yet closed — those outstanding findings are part of the enforcement record for a utility that delivers water to approximately 390,887 people throughout its service territory.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 4 (2021) to 4 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Metropolitan District Commission Source: EPA SDWIS service area boundaries.
Service area boundary — Grade A
Service Area Demographics
The Metropolitan District Commission serves a community with a median household income of $98,585 and an estimated 559,823 residents across its service area. Approximately 78% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Metropolitan District Commission'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 Metropolitan District Commission compares to EPA limits
What This Means For You
Surface Water Treatment Rule at 10 mg/L exceeds the EPA maximum of mg/L.
Stage 2 DBP Rule at 8 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 6 mg/L exceeds the EPA maximum of mg/L.
Consumer Confidence Report Rule at 5 mg/L exceeds the EPA maximum of mg/L.
Total Coliform at 3 presence exceeds the EPA maximum of presence.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 62 detections recorded. 18 exceed federal EPA limits (4 ppt for PFOA/PFOS). 4 exceed state limits.
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
METROPOLITAN DISTRICT COMMISSION (EPA ID: CT0640011) is a community water system in Connecticut that serves approximately 390,887 people from surface water sources.
This system provides water to 58 ZIP codes across 18 communities.
Average Home Safety Score: A (86/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| August 20, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| August 10, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| June 8, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| April 1, 2025 | Barium | Health-based | Unresolved |
| February 13, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| January 1, 2025 | Consumer Confidence Report Rule | Monitoring | Resolved |
| January 1, 2025 | Revised Total Coliform Rule | Monitoring | Resolved |
| January 1, 2025 | Barium | Health-based | Unresolved |
| December 30, 2024 | Stage 1 DBP Rule | Monitoring | Unresolved |
| December 23, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| December 1, 2024 | Fecal Coliform | Monitoring | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Unresolved |
| October 1, 2024 | Barium | Health-based | Unresolved |
| August 16, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| August 10, 2024 | Surface Water Treatment Rule | Monitoring | Unresolved |
| July 1, 2024 | Stage 1 DBP Rule | Monitoring | Resolved |
| July 1, 2024 | Surface Water Treatment Rule | Monitoring | Unresolved |
| July 1, 2024 | Barium | Health-based | Unresolved |
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 | 10 | No |
| Stage 2 DBP Rule | Treatment Failure | 8 | Yes |
| Lead and Copper Rule | Treatment Failure | 6 | No |
| Barium | Inorganic | 5 | Yes |
| Consumer Confidence Report Rule | Reporting Failure | 5 | Yes |
| Total Coliform | Microbiological | 3 | No |
| Contaminant 1919 | Other Violation | 2 | No |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Revised Total Coliform Rule | Microbiological | 1 | No |
| Fecal Coliform | Microbiological | 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 |
|---|---|---|---|
| 06067 | 0.007 mg/L | No | N/A |
| 06101 | 0.00669 mg/L | No | N/A |
| 06102 | 0.00669 mg/L | No | N/A |
| 06103 | 0.00669 mg/L | No | N/A |
| 06104 | 0.00669 mg/L | No | N/A |
| 06105 | 0.00669 mg/L | No | N/A |
| 06106 | 0.00669 mg/L | No | N/A |
| 06112 | 0.00669 mg/L | No | N/A |
| 06114 | 0.00669 mg/L | No | N/A |
| 06115 | 0.00669 mg/L | No | N/A |
| 06120 | 0.00669 mg/L | No | N/A |
| 06123 | 0.00669 mg/L | No | N/A |
| 06126 | 0.00669 mg/L | No | N/A |
| 06132 | 0.00669 mg/L | No | N/A |
| 06134 | 0.00669 mg/L | No | N/A |
| 06140 | 0.00669 mg/L | No | N/A |
| 06141 | 0.00669 mg/L | No | N/A |
| 06142 | 0.00669 mg/L | No | N/A |
| 06143 | 0.00669 mg/L | No | N/A |
| 06144 | 0.00669 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
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: 26 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 32 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.
This system serves 58 ZIP codes:
06001 · 06002 · 06026 · 06032 · 06033 06037 · 06040 · 06042 · 06064 · 06067 06073 · 06074 · 06095 · 06096 · 06101 06102 · 06103 · 06104 · 06105 · 06106 06107 · 06108 · 06109 · 06110 · 06111 06112 · 06114 · 06115 · 06117 · 06118 06119 · 06120 · 06123 · 06126 · 06132 06134 · 06140 · 06141 · 06142 · 06143 06144 · 06145 · 06146 · 06147 · 06150 06151 · 06152 · 06153 · 06154 · 06155 06156 · 06160 · 06161 · 06167 · 06176 06180 · 06183 · 06199
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Metropolitan District Commission (CT0640011) on EPA.gov.
Frequently Asked Questions
Is Metropolitan District Commission water safe to drink?
Metropolitan District Commission has recorded 14 health-based violations 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 Metropolitan District Commission serve?
Metropolitan District Commission serves approximately 390,887 people across 58 ZIP codes in Connecticut.
Where does Metropolitan District Commission get its water?
The primary water source is surface water.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from MDC Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: MDC Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
The Connecticut DPH Drinking Water Section completed assessments of all public drinking water sources in 2003 to identify and document potential sources of contamination that could adversely impact drinking water quality. The assessments found that reservoirs owned by the MDC have a low susceptibility to potential sources of contamination.
Treatment regime
How this utility classifies its treatment process and what each reported treatment chemical does.
Treatment chemicals and what each one does
Chemical names are reported verbatim by the utility. Purpose categories are ZipCheckup annotations based on standard drinking-water treatment practice.
Treatment classification and chemical list sourced from MDC Consumer Confidence Report.
Treatment intensity is a ZipCheckup-derived classification based on the chemicals and processes the utility reports. Chemicals and contamination sources are taken verbatim from the utility's CCR filing. Routine federal monitoring and contaminant testing shown elsewhere on this page determine whether the water meets safety standards, not the treatment classification.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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 →
The MDC prepared a service line inventory for the materials of each line in the District’s distribution system. The inventory and description of the programs are available to customers on the Drinking Water section of the MDC’s website, www.themdc.org.
Lead Service Line Replacement Tracker
This water utility's lead service line (LSL) replacement program is tracked from public Consumer Confidence Report filings. Email signup notifies subscribers when the utility files an updated replacement plan or progress milestone.
MDC
ZipCheckup is not affiliated with this water utility. LSL replacement-program data is sourced from public CCR filings published by the utility. Subscription notifications are based on automated parsing of subsequent CCR releases.
Learn more about Lead and Copper Rule replacement requirements →
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.
Aesthetic water quality
These measurements describe the look, taste, and feel of the water this utility delivers. They are not contaminant violations — they sit alongside federal Secondary Maximum Contaminant Levels (SMCLs) which the EPA publishes as non-enforceable guidance.
Aesthetic measurements from MDC Consumer Confidence Report.
Aesthetic measurements are reported by the utility from its annual sampling. EPA Secondary MCLs are advisory thresholds — values outside them indicate aesthetic concerns such as taste or appearance, not health violations. Federal contaminant testing is shown in the sections above.
Notable events and violations
This section summarizes events the utility chose to disclose in its most recent Consumer Confidence Report, plus any federal compliance violations the utility recorded against itself. Both lists are utility-authored — ZipCheckup does not audit, judge, or reorder them.
Notable events from the utility's CCR
These bullet entries are the utility's own narration of operational, regulatory, or infrastructure events during the reporting period.
- MDC completed an inventory of all water service lines as part of compliance with the EPA’s revised Lead and Copper Rule in 2024.
ZipCheckup note: items above reflect what the utility published in its most recent CCR. Federal violation records are also tracked separately by the EPA Safe Drinking Water Information System (SDWIS) — the SDWIS record is the authoritative federal source for any specific regulatory action.
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
Metropolitan District Commission (EPA ID: CT0640011) — request the latest Consumer Confidence Report or ask about specific contaminants.