Middlesex County, Connecticut
37 ZIP codes · Avg score 50/100 · Grade D · Updated 2026-06-03
Public water compliance in Middlesex County is below average — 37 ZIP codes, elevated violation rates.
How Middlesex County Compares
How Middlesex County Compares
Middlesex County scores 15 points below the Connecticut state average (65/100) and 18 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Middlesex County, Connecticut
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Estimated additional annual cost per homeowner: $3,086, driven primarily by sea_level
Infrastructure: 0.474% avg pipe failure probability, 81% of ZIPs at high risk
75.1% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
↑ Worsening trendEPA violation counts by year across Middlesex County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 36 violations. Past 5 years: 42 total (42 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $3,086
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
145,592 housing units in Middlesex County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Middlesex County
Remediation costs are relatively manageable for most homeowners in Middlesex County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Water Systems with Most Violations
Top 5 systems in Middlesex County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Middletown Water Department | 41,019 | 47 |
| 2 | Change Meadowbrook Manor Inc. | 30 | 43 |
| 3 | M&m Realty Holdings Llc | 87 | 42 |
| 4 | Durham Center Division | 1,601 | 34 |
| 5 | Yeshiva of Waterbury-durham Campus | 490 | 34 |
44 total water systems serve Middlesex County.
All ZIP Codes in Middlesex County
37 ZIP codes tracked in Middlesex County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 6469 | Moodus | 69 | C | 6 (1 health) | $307K |
| 2 | 6455 | Middlefield | 66 | C | 19 (1 health) | $393K |
| 3 | 6419 | Killingworth | 65 | C | 8 (2 health) | $389K |
| 4 | 6423 | East Haddam | 64 | C | 11 (1 health) | $374K |
| 5 | 6438 | Haddam | 63 | C | 1 | $377K |
| 6 | 6417 | Deep River | 61 | C | 3 (1 health) | $349K |
| 7 | 6424 | East Hampton | 61 | C | 25 (1 health) | $323K |
| 8 | 6459 | Middletown | 61 | C | 14 (1 health) | — |
| 9 | 6416 | Cromwell | 60 | C | 1 | $311K |
| 10 | 6422 | Durham | 60 | C | 34 (4 health) | $405K |
| 11 | 6457 | Middletown | 56 | C | 14 (1 health) | $280K |
| 12 | 6480 | Portland | 56 | C | 6 (1 health) | $306K |
| 13 | 6412 | Chester | 54 | D | 7 (3 health) | $404K |
| 14 | 6481 | Rockfall | 54 | D | 7 (1 health) | $341K |
| 15 | 6498 | Westbrook | 54 | D | 3 (1 health) | $424K |
| 16 | 6409 | Centerbrook | 53 | D | 0 | $367K |
| 17 | 6413 | Clinton | 53 | D | 5 (2 health) | $357K |
| 18 | 6439 | Hadlyme | 53 | D | 0 | $589K |
| 19 | 6601 | Bridgeport | 53 | D | 0 | — |
| 20 | 6426 | Essex | 52 | D | 15 (2 health) | $720K |
| 21 | 6441 | Higganum | 45 | D | 0 | $380K |
| 22 | 6442 | Ivoryton | 45 | D | 0 | $451K |
| 23 | 6607 | Bridgeport | 45 | D | 0 | $219K |
| 24 | 6608 | Bridgeport | 45 | D | 0 | $223K |
| 25 | 6610 | Bridgeport | 45 | D | 0 | $225K |
| 26 | 6414 | Cobalt | 41 | D | 11 (1 health) | $329K |
| 27 | 6456 | Middle Haddam | 40 | D | 0 | $429K |
| 28 | 6602 | Bridgeport | 40 | D | 0 | — |
| 29 | 6673 | Bridgeport | 40 | D | 0 | — |
| 30 | 6699 | Bridgeport | 40 | D | 0 | — |
| 31 | 6838 | Greens Farms | 40 | D | 0 | — |
| 32 | 6890 | Southport | 40 | D | 0 | $1087K |
| 33 | 6475 | Old Saybrook | 35 | F | 0 | $479K |
| 34 | 6604 | Bridgeport | 35 | F | 0 | $231K |
| 35 | 6605 | Bridgeport | 35 | F | 0 | $273K |
| 36 | 6606 | Bridgeport | 35 | F | 0 | $272K |
| 37 | 6615 | Stratford | 35 | F | 0 | $349K |
Recommended Buyer Guides for Middlesex County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 75.1% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Middlesex County, Connecticut
Overview
Middlesex County in Connecticut covers 37 ZIP codes with an average Home Safety Score of D (50/100).
18 of 37 ZIP codes have recorded EPA violations. 24 health-based violations have been documented.
← Back to Connecticut water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.
What You Can Do
Middlesex County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
75.1% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.