2026 Rankings

ZIP Codes with Most EPA Violations in Connecticut — ...

Last updated: August 31, 2026

173 ZIP codes ranked by Recorded EPA Violations #1: ZIP 06804 (Brookfield, CT) - 275
Lead Violations Lowest Score Safest Flood Risk Energy Cost Radon PFAS Reliability EJ Index Homebuyer Risk CO & Gas Safest Gas Remediation Burden Unresolved Violations (by Utility) Water Equity (by Utility)

Out of 173 ZIP codes with data in Connecticut, these are the highest-ranked areas for recorded epa violations. See also: National ZIP Codes with Most EPA Water Violations | All Connecticut Rankings

Statistic Value
ZIP codes ranked 173
Highest value 275
Median value 9
State Connecticut

Top 100 Worst ZIP Codes

Rank ZIP Code City State Recorded EPA Violations Safety Score
1 06804 Brookfield CT 275 33/100
2 06776 New Milford CT 167 50/100
3 06611 Trumbull CT 92 48/100
4 06801 Bethel CT 78 36/100
5 06810 Danbury CT 62 33/100
6 06812 New Fairfield CT 59 —
7 06811 Danbury CT 57 33/100
8 06268 Storrs Mansfield CT 55 50/100
9 06482 Sandy Hook CT 52 33/100
10 06488 Southbury CT 52 33/100
11 06370 Oakdale CT 46 —
12 06755 Gaylordsville CT 46 67/100
13 06037 Berlin CT 45 67/100
14 06877 Ridgefield CT 45 42/100
15 06002 Bloomfield CT 44 83/100
16 06333 East Lyme CT 42 36/100
17 06357 Niantic CT 42 36/100
18 06410 Cheshire CT 38 37/100
19 06023 East Berlin CT 36 —
20 06070 Simsbury CT 33 69/100
21 06424 East Hampton CT 33 —
22 06111 Newington CT 31 87/100
23 06416 Cromwell CT 31 37/100
24 06470 Newtown CT 29 44/100
25 06850 Norwalk CT 27 49/100
26 06851 Norwalk CT 27 49/100
27 06854 Norwalk CT 27 66/100
28 06855 Norwalk CT 27 49/100
29 06897 Wilton CT 27 49/100
30 06340 Groton CT 26 55/100
31 06450 Meriden CT 26 41/100
32 06492 Wallingford CT 26 41/100
33 06853 Norwalk CT 26 66/100
34 06883 Weston CT 26 49/100
35 06089 Weatogue CT 25 72/100
36 06612 Easton CT 25 50/100
37 06840 New Canaan CT 25 50/100
38 06880 Westport CT 25 50/100
39 06468 Monroe CT 24 50/100
40 06484 Shelton CT 24 50/100
41 06604 Bridgeport CT 24 50/100
42 06605 Bridgeport CT 24 50/100
43 06606 Bridgeport CT 24 50/100
44 06607 Bridgeport CT 24 50/100
45 06608 Bridgeport CT 24 50/100
46 06610 Bridgeport CT 24 50/100
47 06614 Stratford CT 24 50/100
48 06615 Stratford CT 24 50/100
49 06807 Cos Cob CT 24 50/100
50 06820 Darien CT 24 50/100
51 06824 Fairfield CT 24 50/100
52 06825 Fairfield CT 24 50/100
53 06830 Greenwich CT 24 50/100
54 06831 Greenwich CT 24 50/100
55 06870 Old Greenwich CT 24 50/100
56 06878 Riverside CT 24 50/100
57 06890 Southport CT 24 50/100
58 06896 Redding CT 24 —
59 06901 Stamford CT 24 50/100
60 06902 Stamford CT 24 —
61 06903 Stamford CT 24 50/100
62 06905 Stamford CT 24 50/100
63 06906 Stamford CT 24 50/100
64 06907 Stamford CT 24 50/100
65 06026 East Granby CT 23 67/100
66 06473 North Haven CT 22 43/100
67 06260 Putnam CT 20 60/100
68 06489 Southington CT 20 77/100
69 06062 Plainville CT 19 78/100
70 06795 Watertown CT 18 76/100
71 06415 Colchester CT 17 41/100
72 06382 Uncasville CT 14 41/100
73 06455 Middlefield CT 14 45/100
74 06779 Oakville CT 14 78/100
75 06479 Plantsville CT 13 79/100
76 06069 Sharon CT 12 —
77 06444 Marion CT 12 79/100
78 06457 Middletown CT 12 46/100
79 06467 Milldale CT 12 79/100
80 06716 Wolcott CT 12 46/100
81 06052 New Britain CT 11 97/100
82 06250 Mansfield Center CT 11 73/100
83 06481 Rockfall CT 11 —
84 06704 Waterbury CT 11 63/100
85 06708 Waterbury CT 11 63/100
86 06269 Storrs Mansfield CT 10 59/100
87 06339 Ledyard CT 9 —
88 06351 Jewett City CT 9 46/100
89 06385 Waterford CT 9 64/100
90 06442 Ivoryton CT 9 60/100
91 06032 Farmington CT 8 81/100
92 06074 South Windsor CT 8 80/100
93 06081 Tariffville CT 8 —
94 06010 Bristol CT 7 82/100
95 06035 Granby CT 7 81/100
96 06066 Vernon Rockville CT 7 64/100
97 06082 Enfield CT 7 81/100
98 06084 Tolland CT 7 63/100
99 06238 Coventry CT 7 77/100
100 06320 New London CT 7 64/100

Methodology

Violation counts include all types recorded in the EPA SDWIS database: Maximum Contaminant Level (MCL) violations, treatment technique violations, and monitoring/reporting violations. Both resolved and unresolved violations are counted. Higher counts may reflect longer system histories or larger service areas.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-08-31.

Frequently Asked Questions

What counts as an EPA water violation?

EPA violations include exceeding Maximum Contaminant Levels (MCLs), failing to treat water properly (treatment technique violations), and not testing or reporting on schedule (monitoring violations). Health-based violations are the most serious.

Does a high violation count mean the water is unsafe now?

Not necessarily. Many violations are historical or monitoring-related. However, a pattern of repeated violations indicates systemic issues with water system management or infrastructure.

Explore More Rankings

How this ranking is calculated, data sources, and limitations: Rankings Methodology →

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Disclaimer: Rankings are based on EPA, FEMA, and federal agency data. They reflect historical patterns and risk indicators, not necessarily current conditions. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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