Massachusetts Water Systems

Compiled by PlainEnviro Editorial, Environmental Data Editorial Team · July 13, 2026

564 community water systems in Massachusetts, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems

564

Total Violations

1,106

Health Violations

236 systems

Population Served

10,048,568

Massachusetts operates 564 community water systems regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. Together these utilities serve an estimated 10,048,568 residents, each filing compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency.

Across the state, SDWIS records contain 1,106 total violations, of which 236 systems carry at least one active health-based violation, a Maximum Contaminant Level (MCL) exceedance or treatment-technique failure. That represents roughly 42% of Massachusetts systems.

Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.

Which water systems have violations? (223)

#	System Name	City	Source	Violations	Pop. Served	Health
1	TWIN OAKS MHP MIDLAND Savoy	Savoy	Groundwater	65	234	Yes
2	CHERRY VALLEY/ ROCHDALE WATER DISTRICT Rochdale	Rochdale	Surface Water	48	3,696	Yes
3	BOUMIL GROVE CONDOS Andover	Andover	Groundwater	35	72	Yes
4	SPRINGFIELD WATER AND SEWER COMMISSION Springfield	Springfield	Surface Water	27	167,954	Yes
5	LONGMEADOW WATER DEPT Longmeadow	Longmeadow	Surface Water	26	15,815	Yes
6	MOUNT ST MARYS ABBEY Wrentham	Wrentham	Groundwater	26	60	Yes
7	BELLINGHAM DPW WATER SEWER DIVISION Bellingham	Bellingham	Groundwater	23	16,061	Yes
8	MONROE WATER DISTRICT Monroe	Monroe	Surface Water	23	55	Yes
9	DARTMOUTH WATER DIVISION Dartmouth	Dartmouth	Surface Water	22	24,630	Yes
10	HANOVER WATER DEPT Hanover	Hanover	Surface Water	21	14,984	Yes
11	COUNTRY MANOR Norton	Norton	Groundwater	21	66	Yes
12	SWANSEA WATER DISTRICT Swansea	Swansea	Surface Water	20	17,375	Yes
13	PLAINVILLE WATER DEPARTMENT Plainville	Plainville	Surface Water	20	8,805	Yes
14	SOMERSET WATER DEPARTMENT Somerset	Somerset	Surface Water	18	18,303	Yes
15	THREE RIVERS M H COMMUNITY Sudbury	Sudbury	Groundwater	15	63	Yes
16	RUTLAND WATER DEPARTMENT Rutland	Rutland	Surface Water	14	5,605	Yes
17	EAST LONGMEADOW DPW WATER DEPT East Longmeadow	East Longmeadow	Surface Water	12	16,161	Yes
18	HOLLISTON WATER DEPARTMENT Holliston	Holliston	Groundwater	12	15,713	Yes
19	MAYNARD DPW, WATER DIVISION Maynard	Maynard	Groundwater	12	10,401	Yes
20	CHESTER WATER DEPT Chester	Chester	Surface Water	12	750	Yes
21	THE DOX CONDOS Northbridge	Northbridge	Groundwater	11	55	Yes
22	AGAWAM WATER DEPARTMENT Agawam	Agawam	Surface Water	10	28,692	Yes
23	MELROSE WATER DIVISION (MWRA) Melrose	Melrose	Surface Water	9	29,357	Yes
24	SCITUATE WATER DIVISION Scituate	Scituate	Surface Water	9	19,297	Yes
25	NORTON WATER DEPARTMENT Norton	Norton	Groundwater	9	19,161	Yes
26	NORTH READING WATER DEPT. North Reading	North Reading	Surface Water	9	16,054	Yes
27	REVEL PELHAM Westborough	Westborough	Groundwater	9	123	Yes
28	MEDFORD WATER DEPT. (MWRA) Medford	Medford	Surface Water	8	61,700	Yes
29	MILL RIVER WATER TAKERS ASSOCIATION Mill River	Mill River	Groundwater	8	150	Yes
30	LOWELL REGIONAL WATER UTILITY Lowell	Lowell	Surface Water	7	115,000	Yes
31	MALDEN WATER DIVISION (MWRA) Malden	Malden	Surface Water	7	66,263	Yes
32	BILLERICA WATER WORKS Billerica	Billerica	Surface Water	7	42,119	Yes
33	CHELSEA WATER DEPT. (MWRA) Chelsea	Chelsea	Surface Water	7	38,319	Yes
34	STONEHAM WATER DEPT (MWRA SUPPLY) Stoneham	Stoneham	Surface Water	7	23,244	Yes
35	WESTMINSTER DEPARTMENT OF PUBLIC WORKS Westminster	Westminster	Surface Water	7	3,741	Yes
36	HOUSATONIC WATER WORKS Great Barrington	Great Barrington	Surface Water	7	1,391	Yes
37	FALMOUTH WATER DEPT Falmouth	Falmouth	Surface Water	6	97,551	Yes
38	SOMERVILLE WATER DEPT. (MWRA) Somerville	Somerville	Surface Water	6	81,045	Yes
39	EVERETT WATER DEPT. (MWRA) Everett	Everett	Surface Water	6	49,075	Yes
40	WESTON WATER DEPT. Weston	Weston	Surface Water	6	11,941	Yes
41	GREAT BARRINGTON FIRE DIST Great Barrington	Great Barrington	Groundwater	6	4,375	Yes
42	BROCKTON WATER DEPARTMENT Brockton	Brockton	Surface Water	5	105,643	Yes
43	WALTHAM WATER DEPARTMENT Waltham	Waltham	Surface Water	5	65,218	Yes
44	REVERE WATER DIVISION (MWRA) Revere	Revere	Surface Water	5	62,186	Yes
45	LEOMINSTER WATER DIVISION Leominster	Leominster	Surface Water	5	41,683	Yes
46	ABINGTON/ROCKLAND JOINT WTR. WORKS Rockland	Rockland	Surface Water	5	33,647	Yes
47	NORWOOD WATER DEPT. (MWRA) Norwood	Norwood	Surface Water	5	29,909	Yes
48	MILTON WATER DEPT. (MWRA) Milton	Milton	Surface Water	5	28,630	Yes
49	WAKEFIELD WATER DEPT Wakefield	Wakefield	Surface Water	5	27,090	Yes
50	WILMINGTON WATER DEPT Wilmington	Wilmington	Surface Water	5	22,481	Yes
51	WINTHROP WATER DIVISION, (MWRA) Winthrop	Winthrop	Surface Water	5	19,316	Yes
52	CONCORD WATER DEPT Concord	Concord	Surface Water	5	18,788	Yes
53	ROWLEY WATER DEPARTMENT Rowley	Rowley	Groundwater	5	6,283	Yes
54	DIGHTON WATER DISTRICT North Dighton	North Dighton	Surface Water	5	5,264	Yes
55	SOUTH DEERFIELD WATER SUPPLY DISTRICT South Deerfield	South Deerfield	Surface Water	5	3,800	Yes
56	LONG POND REALTY TRUST Plymouth	Plymouth	Groundwater	5	90	Yes
57	NEWTON WATER DEPT. (MWRA) Newton	Newton	Surface Water	4	88,415	Yes
58	BROOKLINE WATER AND SEWER DIVISION Brookline	Brookline	Surface Water	4	63,191	Yes
59	WATERTOWN WATER DEPT. (MWRA) Watertown	Watertown	Surface Water	4	35,329	Yes
60	LEXINGTON WATER DEPT. (MWRA) Lexington	Lexington	Surface Water	4	34,074	Yes
61	TEWKSBURY WATER DEPARTMENT Tewksbury	Tewksbury	Surface Water	4	31,342	Yes
62	BELMONT WATER DEPT. (MWRA) Belmont	Belmont	Surface Water	4	27,295	Yes
63	SAUGUS WATER DEPT. (MWRA) Saugus	Saugus	Surface Water	4	27,082	Yes
64	SWAMPSCOTT WATER DEPT. (MWRA) Swampscott	Swampscott	Surface Water	4	15,175	Yes
65	KINGSTON WATER DEPARTMENT Kingston	Kingston	Groundwater	4	14,712	Yes
66	FAIRHAVEN WATER DEPT Fairhaven	Fairhaven	Groundwater	4	14,470	Yes
67	HAMILTON WATER DEPT Hamilton	Hamilton	Groundwater	4	7,377	Yes
68	NAHANT WATER DEPT. (MWRA) Nahant	Nahant	Surface Water	4	3,334	Yes
69	MCI BRIDGEWATER Milford	Milford	Surface Water	4	2,802	Yes
70	WRENTHAM DEVELOPMENTAL CENTER Wrentham	Wrentham	Groundwater	4	937	Yes
71	REGENCY AT STOW CONDOMINIUMS Bedford	Bedford	Groundwater	4	132	Yes
72	QUINCY WATER DEPT. (MWRA) Quincy	Quincy	Surface Water	3	106,000	Yes
73	FRAMINGHAM WATER DEPT. (MWRA) Framingham	Framingham	Surface Water	3	72,362	Yes
74	PEABODY WATER DEPT. Peabody	Peabody	Surface Water	3	54,481	Yes
75	ARLINGTON WATER DEPT. (MWRA) Arlington	Arlington	Surface Water	3	46,308	Yes
76	WOBURN WATER DEPT. Woburn	Woburn	Surface Water	3	40,876	Yes
77	AMHERST DPW WATER DIVISION Amherst	Amherst	Surface Water	3	39,263	Yes
78	ANDOVER WATER DEPT Andover	Andover	Surface Water	3	36,569	Yes
79	NEEDHAM WATER DEPT Needham	Needham	Surface Water	3	33,130	Yes
80	READING WATER DEPARTMENT (MWRA) Reading	Reading	Surface Water	3	27,358	Yes
81	WAREHAM FIRE DISTRICT Parkwood Beach	Parkwood Beach	Groundwater	3	21,418	Yes
82	MARBLEHEAD WATER DEPT. (MWRA) Marblehead	Marblehead	Surface Water	3	20,441	Yes
83	PEMBROKE WATER DIVISION DPW Pembroke	Pembroke	Groundwater	3	18,251	Yes
84	MEDFIELD WATER DEPT. Medfield	Medfield	Groundwater	3	12,894	Yes
85	UXBRIDGE DPW, WATER DIVISION Uxbridge	Uxbridge	Groundwater	3	11,525	Yes
86	WHITINSVILLE WATER COMPANY Whitinsville	Whitinsville	Surface Water	3	7,933	Yes
87	MERRIMAC WATER DEPARTMENT Merrimac	Merrimac	Groundwater	3	7,193	Yes
88	MARION WATER DIVISION Marion	Marion	Groundwater	3	5,761	Yes
89	MANCHESTER BY THE SEA DPW Manchester By The Sea	Manchester By The Sea	Surface Water	3	5,170	Yes
90	LYNNFIELD WATER DIST. (MWRA) Lynnfield	Lynnfield	Surface Water	3	4,820	Yes
91	PALMER WATER DISTRICT NO.1 Palmer	Palmer	Surface Water	3	4,789	Yes
92	STURBRIDGE WATER DEPARTMENT Sturbridge	Sturbridge	Surface Water	3	4,567	Yes
93	AQUARION WATER COMPANY (DOVER) Millbury	Millbury	Groundwater	3	1,922	Yes
94	NATURAL PARK APARTMENTS South Hadley	South Hadley	Groundwater	3	60	Yes
95	TORIA HEIGHTS CONDOMINIUM Oxford	Oxford	Groundwater	3	60	Yes
96	ROYAL PINE VILLA Westboro	Westboro	Groundwater	3	55	Yes
97	LAWRENCE WATER WORKS Lawrence	Lawrence	Surface Water	2	88,877	Yes
98	ATTLEBORO WATER DEPT Attleboro	Attleboro	Surface Water	2	46,654	Yes
99	WESTFIELD DPWWATER DIVISION Westfield	Westfield	Surface Water	2	41,094	Yes
100	YARMOUTH WATER DEPARTMENT West Yarmouth	West Yarmouth	Groundwater	2	38,900	Yes
101	MARSHFIELD WATER DEPARTMENT Marshfield	Marshfield	Groundwater	2	34,000	Yes
102	NORTHAMPTON WATER DIVISION Northampton	Northampton	Surface Water	2	29,571	Yes
103	GARDNER WATER DEPARTMENT Gardner	Gardner	Surface Water	2	21,287	Yes
104	NEWBURYPORT WATER DEPARTMENT Newburyport	Newburyport	Surface Water	2	20,335	Yes
105	ASHLAND WATER AND SEWER DEPT. Ashland	Ashland	Groundwater	2	18,832	Yes
106	CLINTON WATER DEPT Clinton	Clinton	Surface Water	2	15,530	Yes
107	NORTH ADAMS WATER DEPT North Adams	North Adams	Surface Water	2	13,000	Yes
108	AUBURN WATER DISTRICT Auburn	Auburn	Surface Water	2	12,255	Yes
109	HANSCOM AFB Bedford	Bedford	Surface Water	2	11,789	Yes
110	HOLBROOK PUBLIC WORKS DEPT Holbrook	Holbrook	Surface Water	2	11,405	Yes
111	ROCKPORT WATER DEPT Rockport	Rockport	Surface Water	2	10,000	Yes
112	PEPPERELL DPW WATER DIVISION Pepperell	Pepperell	Groundwater	2	9,217	Yes
113	GEORGETOWN WATER DEPARTMENT Georgetown	Georgetown	Groundwater	2	8,766	Yes
114	HOPEDALE WATER DEPARTMENT Hopedale	Hopedale	Surface Water	2	6,017	Yes
115	OTIS AIR NATIONAL GUARD BASE Otis Angb	Otis Angb	Groundwater	2	6,000	Yes
116	WINCHENDON WATER DEPARTMENT Winchendon	Winchendon	Surface Water	2	5,706	Yes
117	LINCOLN WATER DEPT Lincoln	Lincoln	Surface Water	2	5,593	Yes
118	TOPSFIELD WATER DEPARTMENT Topsfield	Topsfield	Groundwater	2	5,435	Yes
119	TOWN OF AVON Avon	Avon	Groundwater	2	4,777	Yes
120	NORTH BROOKFIELD WATER DEPARTMENT North Brookfield	North Brookfield	Surface Water	2	3,903	Yes
121	MCI SHIRLEY Milford	Milford	Groundwater	2	3,500	Yes
122	HINSDALE WATER DEPT Hinsdale	Hinsdale	Surface Water	2	1,800	Yes
123	BERNARDSTON FIRE WATER DIST Bernardston	Bernardston	Groundwater	2	1,462	Yes
124	RUSSELL WATER DEPT Russell	Russell	Groundwater	2	1,228	Yes
125	PINE VALLEY PLANTATION Belchertown	Belchertown	Groundwater	2	600	Yes
126	MONTAGUE CENTER WATER DISTRICT Montague	Montague	Groundwater	2	450	Yes
127	HARVARD RIDGE CONDOMINIUM Bedford	Bedford	Groundwater	2	350	Yes
128	PINETREE VILLAGE Carver	Carver	Groundwater	2	348	Yes
129	THE RESERVE AT SPRING HILL Rehoboth	Rehoboth	Groundwater	2	300	Yes
130	GLENGARRY CONDOS Amesbury	Amesbury	Groundwater	2	171	Yes
131	WESTPORT SENIOR VILLAGE Westport	Westport	Groundwater	2	150	Yes
132	GREEN VALLEY MOBILE HOME PARK Lunenburg	Lunenburg	Groundwater	2	127	Yes
133	LEINO PARK WATER DISTRICT Westminster	Westminster	Surface Water	2	120	Yes
134	SPORTS HAVEN MOBILE HOME PARK Belchertown	Belchertown	Groundwater	2	107	Yes
135	COUNTRY ACRES ESTATES, LLC Pittsfield	Pittsfield	Groundwater	2	100	Yes
136	HARDWICK CENTER WATER DISTRICT Gilbertville	Gilbertville	Groundwater	2	80	Yes
137	NORTHBROOK VILLAGE II Wellesley	Wellesley	Groundwater	2	80	Yes
138	THE PRESERVE AT HOPKINTON CONDO Boylston	Boylston	Groundwater	2	80	Yes
139	CADY BROOK CROSSING CONDOMINIUMS Shrewbury	Shrewbury	Groundwater	2	75	Yes
140	COOL SANDY BEACH COMMUNITY WATER SYSTEM Rutland	Rutland	Groundwater	2	70	Yes
141	FAIRHAVEN MOBILE HOME PARK Lunenburg	Lunenburg	Groundwater	2	63	Yes
142	WASHINGTON NORTH MHP Andover	Andover	Groundwater	2	63	Yes
143	PINE HILL VILLAGE CONDOMINIUMS Tyngsborough	Tyngsborough	Groundwater	2	60	Yes
144	HAWTHORNE VILLAGE Southboro	Southboro	Groundwater	2	55	Yes
145	BOSTON WATER AND SEWER COMMISSION (MWRA) Boston	Boston	Surface Water	1	675,647	Yes
146	WORCESTER DPWP, WATER SUPPLY DIVISION Worcester	Worcester	Surface Water	1	206,518	Yes
147	FALL RIVER WATER DEPARTMENT Fall River	Fall River	Surface Water	1	94,000	Yes
148	WEYMOUTH WATER DEPARTMENT Weymouth	Weymouth	Surface Water	1	57,613	Yes
149	PITTSFIELD DPU WATER DEPT Pittsfield	Pittsfield	Surface Water	1	43,927	Yes
150	FITCHBURG DPW DIVISION OF WATER SUPPLY Fitchburg	Fitchburg	Surface Water	1	41,946	Yes
151	DEDHAM WESTWOOD WATER DIST. Dedham	Dedham	Surface Water	1	41,630	Yes
152	MILFORD WATER DEPARTMENT Milford	Milford	Surface Water	1	30,379	Yes
153	WELLESLEY WATER DIVISION Wellesley	Wellesley	Surface Water	1	29,550	Yes
154	STOUGHTON WATER DEPARTMENT Stoughton	Stoughton	Surface Water	1	29,281	Yes
155	WANNACOMET WATER COMPANY Nantucket	Nantucket	Groundwater	1	27,703	Yes
156	WALPOLE WATER DEPT Walpole	Walpole	Groundwater	1	24,070	Yes
157	PROVINCETOWN WATER DEPARTMENT Provincetown	Provincetown	Groundwater	1	22,250	Yes
158	WESTBOROUGH WATER DEPARTMENT Westborough	Westborough	Surface Water	1	21,567	Yes
159	HOLDEN WATER DIVISION, DPW Holden	Holden	Surface Water	1	17,951	Yes
160	WEBSTER WATER DEPARTMENT Webster	Webster	Groundwater	1	17,776	Yes
161	GREENFIELD WATER DEPARTMENT Greenfield	Greenfield	Surface Water	1	17,645	Yes
162	SEEKONK WATER DISTRICT Seekonk	Seekonk	Groundwater	1	14,704	Yes
163	EAST BRIDGEWATER WATER DEPT East Bridgewater	East Bridgewater	Groundwater	1	14,526	Yes
164	WAYLAND WATER DEPARTMENT Wayland	Wayland	Groundwater	1	13,196	Yes
165	MEDWAY WATER DEPARTMENT Medway	Medway	Groundwater	1	13,115	Yes
166	IPSWICH DPU WATER DEPT Ipswich	Ipswich	Surface Water	1	13,090	Yes
167	WARE WATER DEPT Ware	Ware	Groundwater	1	10,066	Yes
168	BLACKSTONE WATER DEPARTMENT Blackstone	Blackstone	Groundwater	1	9,868	Yes
169	WILBRAHAM WATER DEPT (MWRA) Wilbraham	Wilbraham	Surface Water	1	8,533	Yes
170	MATTAPOISETT WATER DEPARTMENT Mattapoisett	Mattapoisett	Groundwater	1	7,685	Yes
171	NORFOLK WATER DIVISION Norfolk	Norfolk	Groundwater	1	7,602	Yes
172	COHASSET WATER DEPT Cohasset	Cohasset	Surface Water	1	7,555	Yes
173	SPENCER WATER DEPARTMENT Spencer	Spencer	Groundwater	1	7,037	Yes
174	STERLING WATER DEPARTMENT Sterling	Sterling	Groundwater	1	6,754	Yes
175	DEVENS MASSDEVELOPMENT Devens	Devens	Groundwater	1	6,500	Yes
176	SOUTH HADLEY FIRE DISTRICT #2 WATER DEPT South Hadley	South Hadley	Groundwater	1	6,200	Yes
177	TISBURY WATER WORKS Tisbury	Tisbury	Groundwater	1	6,082	Yes
178	LANCASTER WATER DEPARTMENT Lancaster	Lancaster	Groundwater	1	6,000	Yes
179	DUDLEY WATER DEPARTMENT Dudley	Dudley	Groundwater	1	5,515	Yes
180	LEE WATER DEPT Lee	Lee	Surface Water	1	5,420	Yes
181	ONSET FIRE DISTRICTWATER DEPT. Onset	Onset	Groundwater	1	5,392	Yes
182	SOUTHAMPTON WATER DEPT Southampton	Southampton	Surface Water	1	4,853	Yes
183	BARRE WATER DEPARTMENT Barre	Barre	Groundwater	1	4,098	Yes
184	WENHAM WATER DEPT. Wenham	Wenham	Groundwater	1	3,942	Yes
185	ASHBURNHAM WATER DEPARTMENT Ashburnham	Ashburnham	Surface Water	1	3,680	Yes
186	BOYLSTON WATER DISTRICT Boylston	Boylston	Groundwater	1	3,343	Yes
187	WELLESLEY COLLEGE Wellesley	Wellesley	Groundwater	1	3,000	Yes
188	STOCKBRIDGE WATER DEPT Stockbridge	Stockbridge	Surface Water	1	2,800	Yes
189	LANESBOROUGH FIRE AND WATER DISTRICT Lanesborough	Lanesborough	Surface Water	1	2,324	Yes
190	WARREN WATER DISTRICT Warren	Warren	Groundwater	1	2,289	Yes
191	MCI NORFOLK/CEDAR JUNCTION/WALPOLE Milford	Milford	Groundwater	1	2,200	Yes
192	HARVARD WATER DEPARTMENT Harvard	Harvard	Groundwater	1	1,422	Yes
193	GILBERTVILLE WATER DISTRICT Gilbertville	Gilbertville	Groundwater	1	1,089	Yes
194	EGREMONT WATER DEPT South Egremont	South Egremont	Surface Water	1	1,000	Yes
195	WEST WARREN WATER DISTRICT West Warren	West Warren	Groundwater	1	927	Yes
196	NORTHFIELD WATER DISTRICT Northfield	Northfield	Groundwater	1	800	Yes
197	SOUTH MEADOW VILLAGE Carver	Carver	Groundwater	1	750	Yes
198	WELLFLEET MUNICIPAL WATER SYSTEM Wellfleet	Wellfleet	Groundwater	1	750	Yes
199	CRANBERRY VILLAGE RESIDENTS ASSOCIATION Carver	Carver	Groundwater	1	414	Yes
200	ASHFIELD WATER DISTRICT Ashfield	Ashfield	Groundwater	1	400	Yes
201	MILLBURY IND. PARK/ PARK HILL VILLAGE Millbury	Millbury	Surface Water	1	400	Yes
202	WHEELWRIGHT WATER DISTRICT Wheelwright	Wheelwright	Groundwater	1	300	Yes
203	EAGLE HILL SCHOOL Hardwick	Hardwick	Groundwater	1	300	Yes
204	NORTH CARVER WATER DISTRICT Carver	Carver	Groundwater	1	300	Yes
205	WHITE PINES CONDOMINIUMS Lenox	Lenox	Groundwater	1	225	Yes
206	SEA OAKS CONDOMINIUMS Barnstable	Barnstable	Groundwater	1	222	Yes
207	BRIGGSVILLE WATER DISTRICT Clarksburg	Clarksburg	Groundwater	1	180	Yes
208	JAKES PATH PWS Middleborough	Middleborough	Groundwater	1	168	Yes
209	AQUARION WATER CO. (SPRINGDALE FARMS) Millbury	Millbury	Groundwater	1	126	Yes
210	WINNSTOCK CONDOS N Quincy	N Quincy	Groundwater	1	125	Yes
211	LANCASTER WOODS CONDOMINIUMS Westborough	Westborough	Groundwater	1	120	Yes
212	COLONY HEIGHTS CONDOMINIUM Tyngsborough	Tyngsborough	Groundwater	1	120	Yes
213	CRAWFORD HILLS Arlington	Arlington	Groundwater	1	118	Yes
214	PINE HILL CONDOMINIUM Worcester	Worcester	Groundwater	1	95	Yes
215	WILLOW GROVE TRAILER PARK Lawrence	Lawrence	Groundwater	1	88	Yes
216	LIBERTY HOUSE CONDOMINIUM Acton	Acton	Groundwater	1	80	Yes
217	CRESCENT VALLEY CONDOS Chicopee	Chicopee	Groundwater	1	78	Yes
218	MOUNTAIN VIEW MHP Andover	Andover	Groundwater	1	75	Yes
219	ANNS LANDING Littleton	Littleton	Groundwater	1	63	Yes
220	BOLTON COUNTRY MANOR Worcester	Worcester	Groundwater	1	60	Yes
221	BENCHMARK CONDOMINIUMS Tyngsborough	Tyngsborough	Groundwater	1	60	Yes
222	ELIZABETH BROOK APARTMENTS Stow	Stow	Groundwater	1	54	Yes
223	PALATINE MANOR East Long Meadow	East Long Meadow	Groundwater	1	54	Yes

Systems with No Violations (277)

277 water systems in Massachusetts have zero recorded violations. Showing the 50 largest by population served.

MWRA (2,660,000) CAMBRIDGE WATER DEPARTMENT (118,214) INIMA USA / AQUARIA LLC (105,643) LYNN WATER AND SEWER COMM (101,253) CITY OF NEW BEDFORD DPI (101,079) SALEM AND BEVERLY WATER SUPPLY BOARD (90,330) DENNIS WATER DISTRICT (65,000) HAVERHILL WATER DEPT (63,235) TAUNTON WATER DIVISION (62,165) UPPER CAPE REGIONAL WATER COOPERATIVE (56,250) CHICOPEE WATER DEPT (MWRA) (55,560) METHUEN WATER DEPT (53,059) CENTERVILLE OSTERVILLE MARSTONS MILLS WD (50,000) BEVERLY WATER DEPT (47,461) PLYMOUTH WATER DEPARTMENT (46,799) RANDOLPH/HOLBROOK JOINT WATER BOARD (45,767) WEIR RIVER WATER SYSTEM (45,339) SALEM WATER DEPARTMENT (44,480) MARLBOROUGH DPW WATER DIV. (MWRA) (41,799) HOLYOKE WATER WORKS (40,124) HARWICH WATER DEPARTMENT (39,144) BRAINTREE WATER AND SEWER DEPT. (39,143) SHREWSBURY WATER DEPARTMENT (38,325) GLOUCESTER PUBLIC UTILITY DIVISION (37,440) NATICK WATER AND SEWER DIVISION (37,006) MASHPEE WATER DISTRICT (36,922) HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE (35,000) BREWSTER WATER DEPARTMENT (35,000) RANDOLPH WATER DEPARTMENT (34,362) FRANKLIN WATER DEPARTMENT (33,399) NORTH ANDOVER WATER DEPT (30,915) CHATHAM WATER DEPARTMENT (30,000) MATTAPOISETT RIVER VALLEY W.D. (29,600) NORTH ATTLEBORO WATER DEPT (28,863) WEST SPRINGFIELD DPW WATER DIVISION (28,835) CHELMSFORD WATER DISTRICT (28,750) BRIDGEWATER WATER DEPARTMENT (28,633) DANVERS WATER DEPT. (28,087) BURLINGTON WATER DEPT (26,680) DRACUT WATER SUPPLY DISTRICT (25,789) OAK BLUFFS WATER DISTRICT (24,000) MANSFIELD WATER DIVISION (23,289) EASTON WATER DIV (23,112) SANDWICH WATER DISTRICT (23,000) WINCHESTER WATER DEPT (22,970) BOURNE WATER DISTRICT (22,500) CANTON WATER DEPT (22,453) ACTON WATER SUPPLY DISTRICT (20,780) HUDSON WATER SUPPLY (20,032) SALISBURY WATER DIVISION (20,000) +227 more

All Water Systems in Massachusetts (564)

Page 4 of 12, ordered by population served.

System	Population Served	Violations
MEDWAY WATER DEPARTMENT	13,115	1
IPSWICH DPU WATER DEPT	13,090	1
NORTH ADAMS WATER DEPT	13,000	2
MEDFIELD WATER DEPT.	12,894	3
HOPKINTON WATER DEPARTMENT	12,586	0
AUBURN WATER DISTRICT	12,255	2
WESTON WATER DEPT.	11,941	6
WRENTHAM WATER DIVISION	11,795	0
HANSCOM AFB	11,789	2
UXBRIDGE DPW, WATER DIVISION	11,525	3
NORWELL WATER DEPARTMENT	11,495	0
HOLBROOK PUBLIC WORKS DEPT	11,405	2
ASH/WIN JOINT WATER AUTHORITY	11,394	0
AQUARION WATER COMPANY, MILLBURY	11,326	0
GRAFTON WATER DISTRICT	10,925	0
RAYNHAM CENTER WATER DISTRICT	10,824	0
SOUTHBOROUGH DPW WATER DIVISION (MWRA)	10,514	0
ATHOL DPW WATER DIVISION	10,418	0
MAYNARD DPW, WATER DIVISION	10,401	12
WARE WATER DEPT	10,066	1
ROCKPORT WATER DEPT	10,000	2
BLACKSTONE WATER DEPARTMENT	9,868	1
LENOX DPW WATER DIVISION	9,800	0
KENWOOD WATER DISTRICT	9,620	0
LITTLETON WATER DEPARTMENT	9,611	0
HANSON WATER DEPARTMENT	9,546	0
PEPPERELL DPW WATER DIVISION	9,217	2
AQUARION WATER COMPANY, PINEHILLS	9,195	0
MILLIS WATER DEPT	9,002	0
PLAINVILLE WATER DEPARTMENT	8,805	20
GEORGETOWN WATER DEPARTMENT	8,766	2
LYNNFIELD CENTER WATER DISTRICT	8,569	0
WILBRAHAM WATER DEPT (MWRA)	8,533	1
AYER DPW WATER DIVISION	8,479	0
ACUSHNET WATER DEPARTMENT	8,384	0
TURNERS FALLS WATER DEPT	8,080	0
EDGARTOWN WATER DEPARTMENT	8,027	0
WHITINSVILLE WATER COMPANY	7,933	3
NORTHBRIDGE WATER DIVISION	7,889	0
WEST BRIDGEWATER WATER DEPT	7,856	0
ADAMS FIRE DISTRICT	7,851	0
BUZZARDS BAY WATER DISTRICT	7,700	0
MATTAPOISETT WATER DEPARTMENT	7,685	1
SOUTHWICK WATER DEPT	7,646	0
NORFOLK WATER DIVISION	7,602	1
COHASSET WATER DEPT	7,555	1
HALIFAX WATER DEPARTMENT	7,553	0
NORTH CHELMSFORD WATER DIST	7,498	0
HAMILTON WATER DEPT	7,377	4
AQUARION WATER COMPANY OXFORD	7,343	0

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Frequently Asked Questions

How many water systems are in Massachusetts?

Massachusetts has 564 community water systems tracked by the EPA, serving a combined population of 10,048,568 people.

How many water systems in Massachusetts have health violations?

236 water systems in Massachusetts have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 42% of all systems in the state.

What is the total number of water violations in Massachusetts?

Massachusetts water systems have accumulated 1,106 total violations across all 564 community water systems.

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About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

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