Nitrate violations in Connecticut
130 active public water systems in Connecticut had a Nitrate violation in the past three years, 8 of them still unresolved. What Nitrate is and why it matters.
Health effects: Methemoglobinemia in infants under 6 months: gut bacteria convert nitrate to nitrite, which blocks oxygen transport in blood. Pregnant women should also take precautions. Chronic adult exposure at elevated levels may increase cancer risk.
Systems with a Nitrate violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Krauszers Derby · New Haven County |
48 | 2 | 0 | |
|
Oakdale Manor Water Association Southbury · New Haven County |
40 | 5 | 2 | |
|
1 Dodgingtown Road Newtown · Fairfield County |
38 | 3 | 0 | |
|
Church of the Epiphany Southbury · New Haven County |
25 | 4 | 0 | |
|
ST Thomas More Catholic Church North Stonington · New London County |
25 | 2 | 0 | |
|
Town Woods Park Old Lyme · New London County |
25 | 3 | 1 | |
|
Village of Boulder Ridge Well #1 Barkhamsted · Litchfield County |
25 | 1 | 0 | |
|
Village of Boulder Ridge Well #2 Barkhamsted · Litchfield County |
25 | 1 | 0 | |
|
Bethel Water Dept Bethel, Danbury · Fairfield County |
9,507 | 6 | 0 | |
|
Southbury Training School Southbury · New Haven County |
816 | 4 | 1 | |
|
Kent School Corp (valley Campus) Kent · Litchfield County |
722 | 2 | 0 | |
|
ST Lukes School Athletic Center New Canaan · Fairfield County |
500 | 5 | 0 | |
|
Woodhaven Apartments Willington · Tolland County |
489 | 2 | 1 | |
|
The Weston Field Club Well #1 Weston · Fairfield County |
291 | 8 | 1 | |
|
Colchester Estates Colchester · New London County |
276 | 6 | 2 | |
|
Bridgewater Plaza Convenience Store Bridgewater · Litchfield County |
262 | 2 | 0 | |
|
Cannabis Retailer at 195 Albany Turnpike Canton · Hartford County |
214 | 3 | 1 | |
|
Congregation Adath Israel Newtown · Fairfield County |
202 | 1 | 0 | |
|
Ashford Hills Apartments Ashford · Windham County |
136 | 8 | 2 | |
|
Ccarc Inc. Berlin · Hartford County |
125 | 1 | 0 | |
|
Mallory Town Hall Sherman · Fairfield County |
112 | 1 | 0 | |
|
Kent School Hockey Rink Kent · Litchfield County |
108 | 2 | 0 | |
|
Atlas Commons Old Saybrook · Middlesex County |
100 | 8 | 1 | |
|
Fall Brook Mobile Home Park Killingly · Windham County |
98 | 6 | 1 | |
|
Bantam Village Litchfield · Litchfield County |
96 | 2 | 0 | |
|
Woods Edge Apartments Mansfield · Tolland County |
96 | 4 | 1 | |
|
Stonington Institute Knollwood North Stonington · New London County |
77 | 1 | 0 | |
|
Stonington Institute Lodge North Stonington · New London County |
77 | 2 | 0 | |
|
Stonington Institute Main Building North Stonington · New London County |
77 | 1 | 0 | |
|
Stonington Institute North Building North Stonington · New London County |
77 | 3 | 0 | |
|
The Weston Field Club Well #2 Weston · Fairfield County |
75 | 8 | 2 | |
|
Round Hill LLC Well# 1&2 Lisbon · New London County |
72 | 9 | 2 | |
|
358 Danbury Road New Milford · Litchfield County |
66 | 3 | 1 | |
|
Mystic Village Apartments Groton · New London County |
66 | 2 | 1 | |
|
Weston Shopping Center Associates, LLC Weston · Fairfield County |
65 | 5 | 1 | |
|
White Barn Children's Center Thompson · Windham County |
65 | 2 | 1 | |
|
Sharon Ridge Apartments Sharon · Litchfield County |
62 | 2 | 0 | |
|
Elmwood Court, LLC Bethel · Fairfield County |
54 | 6 | 2 | |
|
326 Route 87 Columbia Columbia · Tolland County |
50 | 2 | 0 | |
|
Bethany Lutheran Brethren Church Well# 2 Hartland · Hartford County |
50 | 2 | 0 | |
|
Kent School Day Care Kent · Litchfield County |
50 | 1 | 0 | |
|
Sugar Hill, LLC Newtown · Fairfield County |
50 | 3 | 0 | |
|
Trinity Glen-McCa Sharon · Litchfield County |
50 | 2 | 0 | |
|
Cornwall Water Company Cornwall · Litchfield County |
48 | 8 | 2 | |
|
Sunset Apartments LLC Bolton · Tolland County |
46 | 6 | 2 | |
|
381 Town Street East Haddam East Haddam · Middlesex County |
42 | 4 | 1 | |
|
Salem Town Hall Salem · New London County |
41 | 1 | 0 | |
|
Acls Properties Inc. Danbury · Fairfield County |
40 | 3 | 0 | |
|
GR Art and Care Building Stamford · Fairfield County |
40 | 4 | 0 | |
|
Kent School (maintenance Well) Kent · Litchfield County |
40 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate 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.