Windham County, Connecticut
38 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-07-19
ZipCheckup grade for Windham: C.
A mixed picture - some signals here are worth your attention.
Windham County's water quality grade reflects a middle-ground assessment - its 38 ZIP codes range from fully compliant to violation-flagged.
How Windham County Compares
How Windham County Compares
Windham County scores 3 points below the Connecticut state average (65/100) and 6 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-07-19
ZIP Code Risk Map
Water Quality Map: Windham 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: $1,592, driven primarily by energy_code_gap
Infrastructure: 0.499% avg pipe failure probability, 70% of ZIPs at high risk
70.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Windham County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 63 violations. Past 5 years: 102 total (102 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: $1,592
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
48,738 housing units in Windham 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 Windham County
Remediation costs are relatively manageable for most homeowners in Windham 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 serving Windham County
8 community water systems serving Windham County.
- C
- B
- C
- D
- B
- B
Show all 8 water systems
- D
- B
49 total water systems serve Windham County.
Systems with the most violations in Windham County
5 water systems with recorded EPA violations.
- D
- D
- B
- D
- D
All ZIP Codes in Windham County
38 ZIP codes tracked in Windham County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 06373 | Oneco | 83 | B | 0 | $239K |
| 2 | 06377 | Sterling | 83 | B | 0 | $257K |
| 3 | 06239 | Danielson | 82 | B | 2 (1 health) | $261K |
| 4 | 06280 | Windham | 82 | B | 2 (1 health) | $238K |
| 5 | 06259 | Pomfret Center | 78 | B | 12 (1 health) | $390K |
| 6 | 06262 | Quinebaug | 78 | B | 8 (2 health) | $213K |
| 7 | 06277 | Thompson | 74 | B | 10 (3 health) | $275K |
| 8 | 06278 | Ashford | 74 | B | 28 (3 health) | $316K |
| 9 | 06374 | Plainfield | 74 | B | 8 (3 health) | $235K |
| 10 | 06260 | Putnam | 71 | B | 12 (3 health) | $258K |
| 11 | 06234 | Brooklyn | 68 | C | 32 (6 health) | $275K |
| 12 | 06331 | Canterbury | 66 | C | 11 (5 health) | $295K |
| 13 | 06092 | West Simsbury | 63 | C | 0 | $469K |
| 14 | 06242 | Eastford | 63 | C | 0 | $310K |
| 15 | 06247 | Hampton | 63 | C | 0 | $283K |
| 16 | 06268 | Storrs Mansfield | 63 | C | 0 | $329K |
| 17 | 06334 | Bozrah | 63 | C | 0 | $294K |
| 18 | 06354 | Moosup | 63 | C | 0 | $290K |
| 19 | 06380 | Taftville | 63 | C | 0 | $187K |
| 20 | 06389 | Yantic | 55 | C | 0 | — |
| 21 | 06235 | Chaplin | 54 | D | 5 (2 health) | $244K |
| 22 | 06230 | Abington | 53 | D | 0 | — |
| 23 | 06233 | Ballouville | 53 | D | 0 | — |
| 24 | 06243 | East Killingly | 53 | D | 0 | — |
| 25 | 06244 | East Woodstock | 53 | D | 0 | — |
| 26 | 06245 | Fabyan | 53 | D | 0 | — |
| 27 | 06256 | North Windham | 53 | D | 0 | $182K |
| 28 | 06263 | Rogers | 53 | D | 0 | — |
| 29 | 06264 | Scotland | 53 | D | 0 | $292K |
| 30 | 06266 | South Windham | 53 | D | 0 | $225K |
| 31 | 06267 | South Woodstock | 53 | D | 0 | — |
| 32 | 06269 | Storrs Mansfield | 53 | D | 0 | — |
| 33 | 06282 | Woodstock Valley | 53 | D | 0 | $333K |
| 34 | 06332 | Central Village | 53 | D | 0 | $232K |
| 35 | 06387 | Wauregan | 53 | D | 0 | $206K |
| 36 | 06258 | Pomfret | 50 | D | 25 (9 health) | — |
| 37 | 06281 | Woodstock | 46 | D | 16 (8 health) | $396K |
| 38 | 06241 | Dayville | 41 | D | 15 (6 health) | $272K |
Recommended Buyer Guides for Windham County
Four sources - EPA, NSF, FEMA, CDC - drive the match.
- Best Lead Paint Test Kits — 70.6% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Windham County, Connecticut
Overview
Windham County in Connecticut covers 38 ZIP codes with an average Home Safety Score of C (62/100).
14 of 38 ZIP codes have recorded EPA violations. 53 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.