STATE REPORT CT 80 HEALTH VIOLATIONS

Connecticut Home Safety Profiles by ZIP

433 ZIP codes · 195 water systems · IPC plumbing code · Updated

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 433 ZIP codes across Connecticut, covering 195 public water systems that serve about 2,459,143 people. 173 ZIP codes carry at least one EPA violation on record.

433
ZIP Codes
195
Water Systems
173
ZIPs with Violations
IPC
Plumbing Code
C · 63
Avg Safety Score
50%
High Radon Risk (Zone 1)
#44
of 50 States
32%
ZIPs Rated A or B
74%
ZIPs with Violations
C
Connecticut average: 63/100 - ranked #44 of 50 states. 10 points below the national average (73). 74% of ZIP codes have recorded violations.

Connecticut water systems post below-average compliance metrics across multiple counties.

Score Distribution

How Connecticut's 433 ZIP codes are distributed across safety grades.

19
A
41
B
36
C
82
D
10
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 Safest ZIP Codes in Connecticut

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 06051 New BritainHartford 100 A
2 06067 Rocky HillHartford 100 A
3 06073 South GlastonburyHartford 100 A
4 06095 WindsorHartford 100 A
5 06103 HartfordHartford 100 A
6 06105 HartfordHartford 100 A
7 06106 HartfordHartford 100 A
8 06107 West HartfordHartford 100 A
9 06108 East HartfordHartford 100 A
10 06109 WethersfieldHartford 100 A

10 Lowest-Scoring ZIP Codes in Connecticut

#ZIP CodeCityCountyScoreGradeViolations
1 06811 DanburyFairfield 33 F 57
2 06810 DanburyFairfield 33 F 62
3 06804 BrookfieldFairfield 33 F 275
4 06488 SouthburyNew Haven 33 F 52
5 06482 Sandy HookFairfield 33 F 52
6 06801 BethelFairfield 36 F 78
7 06357 NianticNew London 36 F 42
8 06333 East LymeNew London 36 F 42
9 06416 CromwellMiddlesex 37 F 31
10 06410 CheshireNew Haven 37 F 38

County Rankings

Water quality breakdown by county. 8 counties with data in Connecticut.

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
09003 87 A 109 06051 (100) 06037 (67)
09005 78 B 43 06098 (83) 06776 (50)
09013 67 C 20 06226 (83) 06268 (50)
09009 51 D 80 06702 (65) 06488 (33)
09015 66 C 34 06234 (67) 06260 (60)
09011 50 D 38 06378 (66) 06357 (36)
09001 48 D 86 06853 (66) 06811 (33)
09007 56 C 23 06409 (67) 06416 (37)

Most Common Contaminants in Connecticut

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Surface Water Treatment Rule Treatment Technique 93 416 No
Stage 1 DBP Rule Treatment Technique 92 217 Yes
Chromium Inorganic 46 91 No
Barium Inorganic 45 90 No
Cadmium Inorganic 45 90 No
Fluoride Inorganic 45 90 No
Selenium Inorganic 45 90 No
Nickel Inorganic 45 88 No

Overview

We track multi-source home safety signals for 433 ZIP records across Connecticut. Home Safety Score model 4.0.0 is published for 188 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 235 ZIP records, covering 195 community water systems that serve approximately 2,459,143 people.

173 of 235 ZIP codes with a reported violation count in the available EPA record (74%) have recorded EPA violations. 80 health-based violations appear in the available health breakdown.

Plumbing Regulations

Connecticut follows the International Plumbing Code (2018 edition).

  • Plumbing code: IPC (2018)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required

Full Connecticut regulations →

Areas with Most Violations

ZIP Code City Home Safety Grade Violations Health-Based System
06804 Brookfield F 275 9 Aquarion-new Milford Regional
06776 New Milford D 167 3 Aquarion-new Milford Regional
06611 Trumbull D 92 0 Aquarion-eastern Fairfield County
06801 Bethel F 78 1 Bethel Water Department
06810 Danbury F 62 1 Danbury Water Department
06812 New Fairfield — 59 3 Aquarion-ball Pond
06811 Danbury F 57 4 Danbury Water Department
06268 Storrs Mansfield D 55 11 University of Connecticut - Main Campus
06482 Sandy Hook F 52 2 Aquarion-eastern Fairfield County
06488 Southbury F 52 0 Heritage Water Company

Areas with No Violations

ZIP Code City Home Safety Grade System Population
06019 Canton B Ctwc - Naugatuck Reg-collinsville Sys 6,324
06022 Collinsville — Ctwc - Naugatuck Reg-collinsville Sys 6,324
06092 West Simsbury B Aquarion-simsbury Regional 14,691
06098 Winsted B Winsted Water Works 7,784
06231 Amston — Ctwc - Amston Lake Division 910
06234 Brooklyn C Ctwc - Crystal System 6,378
06239 Danielson C Ctwc - Crystal System 6,378
06241 Dayville C Ctwc - Crystal System 6,378
06248 Hebron — Ctwc - Hebron Center Division 1,927
06255 North Grosvenordale — Ctwc - Thompson System 1,070

Home Safety Score

Average Home Safety Score for Connecticut: C (63/100) across 188 scored of 433 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average lead level (90th percentile): 0.0010 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 235 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 216 ZIP codes (50%)
  • Moderate risk (Zone 2): 114 ZIP codes
  • Low risk (Zone 3): 103 ZIP codes

ZIP Code Reports for Connecticut

Largest Communities

ZIP Code City Population Safety Grade Violations
06489 Southington 612,245 B 20
06716 Wolcott 582,480 D 12
06032 Farmington 561,014 B 8
06410 Cheshire 557,677 F 38
06074 South Windsor 543,828 B 8
06042 Manchester 543,460 B 5
06705 Waterbury 526,171 C 6
06492 Wallingford 514,608 D 26
06026 East Granby 507,459 C 23
06037 Berlin 479,977 C 45
06451 Meriden 477,341 D 4
06883 Weston 471,070 D 26
06111 Newington 469,549 A 31
06473 North Haven 456,167 D 22
06850 Norwalk 452,749 D 27
06854 Norwalk 452,749 C 27
06040 Manchester 442,509 B 4
06712 Prospect 442,100 C 4
06033 Glastonbury 442,085 B 4
06851 Norwalk 434,012 D 27

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
06482 Sandy Hook 33 F 52
06488 Southbury 33 F 52
06804 Brookfield 33 F 275
06810 Danbury 33 F 62
06811 Danbury 33 F 57

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
06051 New Britain 100 A 1
06067 Rocky Hill 100 A 1
06073 South Glastonbury 100 A 1
06095 Windsor 100 A 1
06103 Hartford 100 A 1

All 433 ZIP Codes in Connecticut

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in Connecticut

The 12 biggest community water systems serving Connecticut, of 195 total.

Show all 12 water systems

Systems with the most violations in Connecticut

12 systems in Connecticut with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Connecticut?

Connecticut has 195 community water systems serving 2,459,143 people across 433 ZIP codes. There are 1,328 recorded violations, including 80 health-based. 173 of 433 ZIP codes have at least one violation.

What plumbing code does Connecticut follow?

Connecticut follows the IPC plumbing code. A licensed plumber is generally required for plumbing work.

What is the radon risk in Connecticut?

50% of ZIP codes in Connecticut fall in EPA Radon Zone 1 (highest risk).

How to cite this page

APA ZipCheckup. (2026). Connecticut Home Safety Profiles by ZIP. https://zipcheckup.com/states/connecticut/
BibTeX 
@misc{zipcheckup-states-connecticut,
  author = {{ZipCheckup}},
  title  = {{Connecticut Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/connecticut/}
}

Page version: August 2026.

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