Connecticut

500 Utilities
Serving: 2,712,000
Data available: 2014-2019
Contaminants Found: 112

EWG's drinking water quality report for Connecticut shows results of tests conducted by the water utilities in Connecticut and provided to EWG by the Connecticut Department of Public Health.

LARGE UTILITIES

ALL UTILITIES WITH VIOLATIONS

LARGE UTILITIES WITH VIOLATIONS

Below are utilities in Connecticut serving over 10,000 people, listed alphabetically. Click the "more" button below to get the full list of utilities serving over 10,000 people.

Large utilities in Connecticut

Utility	Location	People Served
Aquarion Water Company of Connecticut - Canaan Sys	Bridgeport, CT	10,097
Aquarion Water Company of Connecticut - Greenwich System	Bridgeport, CT	53,041
Aquarion Water Company of Connecticut - Main System	Bridgeport, CT	351,756
Aquarion Water Company of Connecticut - Mystic	Bridgeport, CT	10,784
Aquarion Water Company of Connecticut - Noroton System	Bridgeport, CT	18,737
Aquarion Water Company of Connecticut - Simsbury System	Bridgeport, CT	14,679
Aquarion Water Company of Connecticut - Stamford	Bridgeport, CT	99,415
Aquarion Water Company of Connecticut - Valley System	Bridgeport, CT	13,080
Avon Water Company	Clinton, CT	11,590
Bristol Water Department	Bristol, CT	52,079
Connecticut Water Company - Northern Region-Western System	Clinton, CT	98,390
Cromwell Fire District Water Department	Cromwell, CT	14,316
CTWC - Naugatuck Region-Central System	Clinton, CT	22,108
CTWC - Shoreline Region-Guilford System	Clinton, CT	33,197
CTWC - Unionville System	Clinton, CT	14,693
Danbury Water Department	Danbury, CT	62,055
East Lyme Water & Sewer Commission	Niantic, CT	15,245
Groton Utilities	Groton, CT	30,200
Hazardville Water Company	Enfield, CT	18,544
Manchester Water Department	Manchester, CT	51,066
Meriden Water Division	Meriden, CT	58,441
Metropolitan District Commission	Hartford, CT	390,887
Middletown Water Department	Middletown, CT	41,019
New Britain Water Department	New Britain, CT	73,534
New London Department of Public Utilities	New London, CT	26,273
Norwalk First Taxing District	Norwalk, CT	40,256
Norwich Public Utilities	Norwich, CT	36,067
Regional Water Authority	New Haven, CT	418,900
South Norwalk Electric and Water	Wilton, CT	42,000
Southington Water Department	Southington, CT	43,069

Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Connecticut

The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.

Utility	Location	People Served	Violation Points
Quinebaug Mobile Home Park	Quinebaug, CT	205	22
Miami Beach Water Company	Old Lyme, CT	440	14
Cornwall Water Company	Cornwall Bridge, CT	48	14
Village Market Place	Watertown, CT	462	11
Chippanydale Association	Bristol, CT	52	11
298-302 Albany Turnpike	Canton, CT	28	11
Hemlock Apartments	Madison, CT	72	9
Abby Water LLC	Thompson, CT	100	8
Lake Lillinonah Shores Condos	Brookfield, CT	130	8
Lyme Academy Apartments LLC	Trumbull, CT	48	8
Connecticut Correctional Institute	Wethersfield, CT	9,728	7
Ridgeview Heights	Waterbury, CT	96	7
Birch Hills Condominiums	Waterbury, CT	132	7
Lakeview Mobile Home Park	Norwich, CT	99	6
Meadowbrook Terrace Mobile Home Park	New Haven, CT	158	6
Mallard Cove Condominium Association	East Hampton, CT	177	6
Eldridge Elderly Housing	Morris, CT	40	6
Jensens Inc. Marina Cove Residential	Uncasville, CT	70	6
Northstone Gardens	Stamford, CT	79	6
South Norwalk Electric and Water	Wilton, CT	42,000	5
Southbury Training School	Southbury, CT	1,606	5
Rumsey Hall School	Wastington, CT	398	5
Gaia Gardens	Mamaroneck, CT	276	5
Hillside Condominiums	East Hartford, CT	96	5
Norwich Public Utilities	Norwich, CT	36,067	5
Z Inc.	Cobalt, CT	130	5
Rogers Mobile Home Park - Groton	Mystic, CT	57	5
Hunting Lodge Apartments	Willington, CT	115	5
Grant Hill Associates Inc.	Bloomfield, CT	97	5
Knollwood Apartments	Willington, CT	312	4

Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Connecticut

Utility	Location	People Served	Violation Points
Norwich Public Utilities	Norwich, CT	36,067	5
South Norwalk Electric and Water	Wilton, CT	42,000	5
Aquarion Water Company of Connecticut - Mystic	Bridgeport, CT	10,784	2
Aquarion Water Company of Connecticut - Main System	Bridgeport, CT	351,756	2
Regional Water Authority	New Haven, CT	418,900	1
Aquarion Water Company of Connecticut - Canaan Sys	Bridgeport, CT	10,097	1
Connecticut Water Company - Northern Region-Western System	Clinton, CT	98,390	1
New Britain Water Department	New Britain, CT	73,534	1
Danbury Water Department	Danbury, CT	62,055	1
Southington Water Department	Southington, CT	43,069	1
Middletown Water Department	Middletown, CT	41,019	1
Wallingford Water Department	Wallingford, CT	37,267	1
New London Department of Public Utilities	New London, CT	26,273	1
Windham Water Works	Mansfield Center, CT	21,214	1
Valley Water Systems, Inc.	Plainville, CT	18,231	1
CTWC - Unionville System	Clinton, CT	14,693	1
Aquarion Water Company of Connecticut - Simsbury System	Bridgeport, CT	14,679	1
Avon Water Company	Clinton, CT	11,590	1

Contaminants found in Connecticut above health guidelines

	Found above health guidelines			Found
Contaminant	# of Utilities	People Served		# of Utilities	People Served
Total trihalomethanes (TTHMs)		232	2,667,212			232	2,667,212
Haloacetic acids (HAA5)		221	2,663,367			221	2,663,367
Bromodichloromethane		231	2,663,223			231	2,663,223
Chloroform		216	2,640,181			237	2,664,405
Chromium (hexavalent)		72	2,478,740			73	2,514,807
Haloacetic acids (HAA9)		62	2,406,188			70	2,502,459
Dichloroacetic acid		180	2,353,409			180	2,353,409
Trichloroacetic acid		137	2,273,859			139	2,285,873
Dibromochloromethane		227	2,227,139			232	2,664,004
Nitrate and nitrite		363	2,014,921			477	2,695,312
Nitrate		362	2,014,841			475	2,694,747
Dibromoacetic acid		148	1,685,018			153	1,815,688
Radium, combined (-226 & -228)		199	593,492			200	593,792
Manganese		12	524,617			103	2,524,060
Chlorite		11	233,264			11	233,264
Arsenic		59	233,127			59	233,127
Uranium		211	205,405			236	374,554
Bromoform		79	192,683			149	1,476,139
Chlorate		12	111,980			70	2,466,470
Tetrachloroethylene (perchloroethylene)		6	84,068			6	84,068
1,4-Dioxane		2	51,583			10	643,374
1,2,3-Trichloropropane		1	37,267			4	103,074
Bromochloroacetic acid		2	20,781			2	20,781
Cadmium		13	4,304			13	4,304
Antimony		2	2,235			9	6,160
Strontium-90		4	404			11	10,899
Chloromethane		1	265			42	317,878
Carbon tetrachloride		1	228			1	228
Ethylene dibromide		1	155			2	232
Di(2-ethylhexyl) phthalate		2	92			25	165,052
Tritium		1	60			11	49,463
Styrene		1	48			1	48

Contaminants found in Connecticut above legal limits

Contaminant	# of Utilities	People Served
Arsenic		1	36

Connecticut

500 Utilities

Serving: 2,712,000

Data available: 2014-2019

Contaminants Found: 112

Large utilities in Connecticut

Utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Connecticut

Large utilities that accumulated/accrued the most violation points as of April 2019 to March 2021 in Connecticut

Contaminants found in Connecticut above health guidelines

Contaminants found in Connecticut above legal limits