Hexachlorobenzene violations in Connecticut
31 active public water systems in Connecticut had a Hexachlorobenzene violation in the past three years, 1 of them in the latest quarter of EPA's data. What Hexachlorobenzene is and why it matters.
Systems with a Hexachlorobenzene violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Brunswick School (upper Middle) Greenwich · Fairfield County |
295 | 3 | 0 | |
|
Aquarion-New Milford Regional Brookfield, New Milford · Fairfield County |
13,331 | 4 | 0 | |
|
ST Lukes School Athletic Center New Canaan · Fairfield County |
500 | 5 | 0 | |
|
Yeshiva of Waterbury-Durham Campus Durham · Middlesex County |
490 | 6 | 2 | |
|
Stony Hill Village Condominium Assn Brookfield · Fairfield County |
392 | 4 | 0 | |
|
Linemaster Switch Corp Woodstock · Windham County |
178 | 3 | 1 | |
|
890 Ethan Allen Highway Ridgefield Ridgefield · Fairfield County |
138 | 4 | 1 | |
|
74 Route 37, LLC New Fairfield · Fairfield County |
130 | 4 | 1 | |
|
Great Expectations Day Care & Annex Southbury · New Haven County |
125 | 2 | 0 | |
|
Emmanuel Episcopal Church Weston · Fairfield County |
113 | 6 | 1 | |
|
Atlas Commons Old Saybrook · Middlesex County |
100 | 8 | 1 | |
|
Aquarion-Quarry Ridge Washington · Litchfield County |
84 | 1 | 0 | |
|
Sherman Green Marketplace Sherman · Fairfield County |
79 | 5 | 1 | |
|
School Hill Association, Inc. East Windsor · Hartford County |
77 | 5 | 1 | |
|
Rocky Glen Mill Newtown · Fairfield County |
70 | 6 | 1 | |
|
Granby Congregational Church Granby · Hartford County |
65 | 6 | 1 | |
|
Little Brook RD Property Owners Assn New Hartford · Litchfield County |
64 | 6 | 1 | |
|
Enchanted Garden Ethan Allen Hwy Ridgefield · Fairfield County |
61 | 6 | 1 | |
|
Nod Hill Brewery Ridgefield · Fairfield County |
60 | 7 | 2 | |
|
Sts Cyril&methodius Serbian Orth. Church Middlefield · Middlesex County |
53 | 5 | 1 | |
|
Cornwall Water Company Cornwall · Litchfield County |
48 | 8 | 3 | |
|
125 Commerce Drive Brookfield · Fairfield County |
37 | 4 | 0 | |
|
Tashua Village Association, Inc. Trumbull · Fairfield County |
35 | 6 | 0 | |
|
McMullin Manufacturing Corporation Brookfield · Fairfield County |
33 | 5 | 2 | |
|
255 Route 80 Killingworth Killingworth · Middlesex County |
32 | 4 | 1 | |
|
Salem Manor Condominiums, System #1 Salem · New London County |
32 | 4 | 1 | |
|
Keeler Ridgefield B Ridgefield · Fairfield County |
30 | 8 | 3 | |
|
Windsorville Water Association East Windsor · Hartford County |
29 | 8 | 1 | |
|
298-302 Albany Turnpike Canton · Hartford County |
28 | 4 | 1 | |
|
144 Oxford Road, LLC Oxford · New Haven County |
25 | 4 | 1 | |
|
Golf Performance Center Ridgefield · Fairfield County |
25 | 5 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Hexachlorobenzene, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Hexachlorobenzene alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Connecticut records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.