Connecticut

New Haven County drinking water quality

212 active public water systems serve 723,643 people in New Haven County. 98 are compliant, 114 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 24 carry a health flag.

Active systems 212 32 community systems

People served 724K by public water systems

Systems with violations 114 54% of active systems, past 3 years

Serious violators 1 24 systems carry a health flag

Needs attention

Church of Latter-Day Saints, Southbury CT1301144 · Southbury · Transient non-community system · Serves 121 2 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Public Notice Rule and Revised PN Rule.

Blue Trails Water Association CT0990011 · Durham, North Branford · Community water system · Serves 224 4 rules violated in the past three years. Unresolved: Lead and Copper Rule and Lead and Copper Rule Revisions.

Laticrete International CT0081053 · Bethany · Non-Transient non-community system · Serves 200 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions.

New Life Church South Ridge Complex CT0800024 · Meriden · Non-Transient non-community system · Serves 122 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions.

Surreybrook School CT0081114 · Bethany · Non-Transient non-community system · Serves 105 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions.

Pleasant Valley Shopping Plaza CT1085033 · Oxford · Non-Transient non-community system · Serves 89 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions.

Crestview Condominium Association CT0251021 · Cheshire · Community water system · Serves 84 6 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions, Public Notice Rule and Revised PN Rule, and Consumer Confidence Rule.

Northford Glen Condominium Association CT0990031 · North Branford · Community water system · Serves 84 5 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions and Public Notice Rule and Revised PN Rule.

North Madison Shopping Center CT0769053 · Madison · Non-Transient non-community system · Serves 60 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions.

The Carrot Patch CT0620183 · Hamden · Non-Transient non-community system · Serves 52 2 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions.

14 more systems with a serious violator or health flag designation are in the lists below.

Community water systems

32 systems, largest first

System	Serves	Rules violated, 3 yr	Unresolved
Regional Water Authority Ansonia, Bethany, Branford and 17 more	418,900	0	0
Waterbury Water Department Middlebury, Prospect, Waterbury and 2 more	107,271	2	0
Meriden Water Division Berlin, Cheshire, Meriden and 2 more	58,441	4	0
Wallingford Water Department North Haven, Wallingford	37,267	2	0
Ctwc Shoreline Region-Guilford System Clinton, Guilford, Madison and 2 more	33,975	0	0
Ctwc Naugatuck Region-Central System Beacon Falls, Naugatuck, Prospect and 1 more	22,735	0	0
Aquarion-Valley Ansonia, Beacon Falls, Bethany and 3 more	13,080	0	0
Heritage Water Company Middlebury, Oxford, Southbury	7,300	0	0
Wolcott Water Department Waterbury, Wolcott	2,550	0	0
Ctwc Legend Hill System Madison	1,368	0	0
Aquarion-East Derby Derby, Orange	1,101	1	1
Southbury Training School Southbury	816	4	1
Quonnipaug Hills Main System Guilford	564	2	1
Harmony Acres Mobile Home Park Prospect	465	1	1
Aquarion-Lakeside Southbury	455	0	0
Aquarion-Oxford Towne Center Oxford	449	0	0
Meriden Care Center Llc-Silver Springs Meriden	334	0	0
Arrowhead by the Lake Association, Inc. Wolcott	288	0	0
Blue Trails Water Association Durham, North Branford	224	4	2
Countryside Apartments Wolcott	218	0	0
Aquarion-Clearview Hills Wolcott	215	0	0
Bethany Mobile Home Park Bethany	138	2	1
Idleview Mobile Home Park Naugatuck	138	0	0
Aquarion-Hawkstone Oxford, Seymour	120	0	0
Ctwc Green Springs System Madison	104	1	1
Aquarion-West Shore Middlebury	100	0	0
Crestview Condominium Association Cheshire	84	6	3
Northford Glen Condominium Association North Branford	84	5	2
Middlebury Commons Middlebury	76	1	0
Aquarion-Woodrich Village Wolcott	72	0	0
Oakdale Manor Water Association Southbury	40	5	2
Quonnipaug Hills Section I Guilford	27	0	0

Non-community systems (180: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

System	Serves	Rules violated, 3 yr	Unresolved
Nonnewaug High School Woodbury	887	0	0
Alcott School Wolcott	638	0	0
Bethany Community School Bethany	550	0	0
Calvary Fellowship Southbury Southbury	540	1	0
Melissa Jones School Guilford	484	1	0
Amity Regional Junior High School Bethany	475	0	0
Tyrrell Middle School Wolcott	454	2	2
Frisbie Elementary School Wolcott	446	0	0
Quassy Amusement Park Middlebury	431	1	0
Middlebury Elementary School Middlebury	412	0	0
Camp Laurelwood Madison	400	2	0
125-131 Bradley Road Woodbridge Woodbridge	385	0	0
The Country School (main Building) Madison	360	0	0
The Lake House Wolcott	300	0	0
Tranquility Vineyard and Winery Middlebury	257	0	0
South Broad Street Service Area Wallingford	250	1	0
Church of Latter-Day Saints, Woodbridge Woodbridge	220	0	0
Laticrete International Bethany	200	2	1
171 Amity Road Bethany	180	1	0
YMCA Camp Mountain Laurel Hamden	180	1	0
Church of Latter-Day Saints, Madison Madison	172	0	0
Kettletown S.p./beach Well Southbury	167	1	1
Kettletown S.p./campground Well Southbury	167	0	0
Christ the Savior Orthodox Church Southbury	150	1	0
Children's Village Boundline Wolcott	130	1	0
Great Expectations Day Care & Annex Southbury	125	2	0
New Life Church South Ridge Complex Meriden	122	1	1
Church of Latter-Day Saints, Southbury Southbury	121	2	2
Surreybrook School Bethany	105	1	1
Evan's Deli Bethany	102	2	1
Aggie's Park Oxford	100	0	0
Bethany Mart Bethany	100	0	0
The Meriden YMCA Outdoor Center Meriden	100	0	0
Bright Years Academy Southbury Southbury	96	1	1
Curtis Homestead Village Cheshire	94	0	0
Pleasant Valley Shopping Plaza Oxford	89	2	1
Great Hill United Methodist Church Seymour	85	3	0
980 Rubber Avenue Naugatuck	84	2	0
Comcast of Ct/ga/ma/nh/ny/nc/va/vt, LLC Seymour	75	0	0
Middlebury Hamlet Middlebury	75	0	0
Brightpath Madison West Madison	73	1	1
Amity Village Bethany 63 Plaza Bethany	65	0	0
Brightpath Madison East Madison	63	0	0
Maple Oak Farm and Market Cheshire	62	2	0
North Madison Shopping Center Madison	60	1	1
227 Horse Pond Road Madison Madison	55	1	1
Todays Plaza, LLC Guilford	54	1	0
The Carrot Patch Hamden	52	2	1
15 Orchard Park Industrial Area Madison	50	0	0
5 Ardsley Avenue North Branford	50	0	0
Jackson Cove Oxford	50	0	0
New Haven Sportsman's Club Inc. Guilford	50	3	3
Summer Hill Nurseries Madison	50	0	0
Village Square Middlebury	50	1	1
Farmingbury Golf Course Wolcott	49	1	0
Wolcott Congregational Church Wolcott	49	0	0
Krauszers Derby	48	2	0
Southford Corner, LLC Southbury	47	1	0
Tradition Golf Club at Oak Lane Woodbridge	43	2	1
464 Wolcott Road Wolcott	40	1	0
High Point Gardens Wolcott	40	3	2
Highland Greens (golfcourse Clubhouse) Prospect	40	1	1
North Guilford Congregational Church Guilford	40	3	0
Orchard Park Ind. Area 50 Mungertown Madison	40	0	0
St. Andrews Episcopal Church Madison	40	0	0
23 Amity Road Bethany	38	0	0
Tilcon Connecticut Inc. North Branford North Branford	38	5	1
1189 Wolcott Road Wolcott	37	0	0
Green Acres Mart North Haven	36	0	0
Rosabianca Vineyards North Branford	36	0	0
North Madison Congregational Church Madison	35	0	0
Rockstar Lounge Wolcott	35	1	0
Christ Episcopal Church Oxford	34	5	2
2311 Boston Post Road Guilford Guilford	33	1	0
41 Village Lane Office Park Bethany	33	1	0
716 Derby Avenue Seymour	33	1	0
Guilford Veterinary Hospital Guilford	33	0	0
Wolcott Police Dept Wolcott	33	0	0
Country Corner Diner LLC Bethany	32	1	1
Gyre9 Southbury	32	5	1
Jvp Building Prospect	32	2	1
Kleins Golf Range Madison	31	0	0
The Little Store Guilford	31	2	1
119 Amity Road Bethany	30	2	0
Christ Chapel Madison	30	0	0
Happy Shack Milford	30	1	1
Northford Square North Branford	30	0	0
The Country School (steam Bldg Well #2) Madison	30	0	0
1872 Middletown Avenue North Branford	29	1	1
Madison Commons Madison	28	1	0
Cheshire Public Park Well (lock 12) Cheshire	27	2	2
Middlebury Recreation Park Middlebury	27	2	0
Southford Center Southbury	27	4	1
Woodbridge Club Woodbridge	26	1	0
1 Orchard Park Industrial Area Madison	25	0	0
1273 Wolcott Road (wolcott Inn & Suites) Wolcott	25	2	1
1409 Middletown Avenue North Branford	25	0	0
144 Oxford Road, LLC Oxford	25	4	1
2 North Street Wolcott	25	1	1
231 Oxford Road Oxford Oxford	25	0	0

All 180 in the systems table

Inactive systems (1,045, no longer operating or reporting)

Kept for the record and excluded from the county totals above. Browse inactive systems.

About this data

Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.

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.

New Haven County drinking water quality

Needs attention

Community water systems

Compliant

Violations in the past 3 years

Serious violator

Health flag

Inactive system