Massachusetts Water Systems

Compiled by PlainEnviro · August 25, 2026

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

Water Systems

564

Health-Based Violation Records

1,140

Health Violations

236 systems

Population Served

9,972,169

Massachusetts community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.

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? (224)

#	System Name	City	Source	Violations	Pop. Served	Health
1	TWIN OAKS MHP MIDLAND Savoy	Savoy	Groundwater	68	234	Yes
2	CHERRY VALLEY/ ROCHDALE WATER DISTRICT Rochdale	Rochdale	Surface Water	48	3,696	Yes
3	LONGMEADOW WATER DEPT Longmeadow	Longmeadow	Surface Water	36	15,853	Yes
4	BOUMIL GROVE CONDOS Andover	Andover	Groundwater	35	72	Yes
5	SPRINGFIELD WATER AND SEWER COMMISSION Springfield	Springfield	Surface Water	27	169,170	Yes
6	MOUNT ST MARYS ABBEY Wrentham	Wrentham	Groundwater	26	60	Yes
7	COUNTRY MANOR Norton	Norton	Groundwater	25	66	Yes
8	BELLINGHAM DPW WATER SEWER DIVISION Bellingham	Bellingham	Groundwater	23	16,556	Yes
9	MONROE WATER DISTRICT Monroe	Monroe	Surface Water	23	55	Yes
10	DARTMOUTH WATER DIVISION Dartmouth	Dartmouth	Surface Water	22	24,696	Yes
11	MONTROSE CONDOS Amesbury	Amesbury	Groundwater	22	210	Yes
12	HANOVER WATER DEPT Hanover	Hanover	Surface Water	21	14,984	Yes
13	SWANSEA WATER DISTRICT Swansea	Swansea	Surface Water	20	17,375	Yes
14	PLAINVILLE WATER DEPARTMENT Plainville	Plainville	Surface Water	20	8,805	Yes
15	SOMERSET WATER DEPARTMENT Somerset	Somerset	Surface Water	18	18,303	Yes
16	EAST LONGMEADOW DPW WATER DEPT East Longmeadow	East Longmeadow	Surface Water	16	16,358	Yes
17	THREE RIVERS M H COMMUNITY Sudbury	Sudbury	Groundwater	16	63	Yes
18	RUTLAND WATER DEPARTMENT Rutland	Rutland	Surface Water	14	6,025	Yes
19	NORTH READING WATER DEPT. North Reading	North Reading	Surface Water	13	16,379	Yes
20	HOLLISTON WATER DEPARTMENT Holliston	Holliston	Groundwater	12	15,139	Yes
21	MAYNARD DPW, WATER DIVISION Maynard	Maynard	Groundwater	12	10,616	Yes
22	CHESTER WATER DEPT Chester	Chester	Surface Water	12	750	Yes
23	AGAWAM WATER DEPARTMENT Agawam	Agawam	Surface Water	10	28,692	Yes
24	REVEL PELHAM Westborough	Westborough	Groundwater	10	123	Yes
25	MELROSE WATER DIVISION (MWRA) Melrose	Melrose	Surface Water	9	29,938	Yes
26	SCITUATE WATER DIVISION Scituate	Scituate	Surface Water	9	19,297	Yes
27	NORTON WATER DEPARTMENT Norton	Norton	Groundwater	9	19,161	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	120,418	Yes
31	SOMERVILLE WATER DEPT. (MWRA) Somerville	Somerville	Surface Water	7	81,045	Yes
32	MALDEN WATER DIVISION (MWRA) Malden	Malden	Surface Water	7	66,263	Yes
33	BILLERICA WATER WORKS Billerica	Billerica	Surface Water	7	42,119	Yes
34	CHELSEA WATER DEPT. (MWRA) Chelsea	Chelsea	Surface Water	7	40,787	Yes
35	STONEHAM WATER DEPT (MWRA SUPPLY) Stoneham	Stoneham	Surface Water	7	23,244	Yes
36	WESTMINSTER DEPARTMENT OF PUBLIC WORKS Westminster	Westminster	Surface Water	7	3,889	Yes
37	HOUSATONIC WATER WORKS Great Barrington	Great Barrington	Surface Water	7	1,391	Yes
38	FALMOUTH WATER DEPT Falmouth	Falmouth	Surface Water	6	97,551	Yes
39	EVERETT WATER DEPT. (MWRA) Everett	Everett	Surface Water	6	49,075	Yes
40	WESTON WATER DEPT. Weston	Weston	Surface Water	6	11,391	Yes
41	GREAT BARRINGTON FIRE DIST Great Barrington	Great Barrington	Groundwater	6	4,380	Yes
42	BROCKTON WATER DEPARTMENT Brockton	Brockton	Surface Water	5	105,788	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	33,387	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	21,654	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	6,161	Yes
54	DIGHTON WATER DISTRICT North Dighton	North Dighton	Surface Water	5	5,280	Yes
55	SOUTH DEERFIELD WATER SUPPLY DISTRICT South Deerfield	South Deerfield	Surface Water	5	3,800	Yes
56	WRENTHAM DEVELOPMENTAL CENTER Wrentham	Wrentham	Groundwater	5	937	Yes
57	LONG POND REALTY TRUST Plymouth	Plymouth	Groundwater	5	90	Yes
58	NEWTON WATER DEPT. (MWRA) Newton	Newton	Surface Water	4	88,931	Yes
59	BROOKLINE WATER AND SEWER DIVISION Brookline	Brookline	Surface Water	4	63,191	Yes
60	WATERTOWN DEPARTMENT OF PUBLIC WORKS Watertown	Watertown	Surface Water	4	35,985	Yes
61	LEXINGTON WATER DEPT. (MWRA) Lexington	Lexington	Surface Water	4	34,074	Yes
62	TEWKSBURY WATER DEPARTMENT Tewksbury	Tewksbury	Surface Water	4	31,342	Yes
63	SAUGUS WATER DEPT. (MWRA) Saugus	Saugus	Surface Water	4	27,844	Yes
64	BELMONT WATER DEPT. (MWRA) Belmont	Belmont	Surface Water	4	27,442	Yes
65	SWAMPSCOTT WATER DEPT. (MWRA) Swampscott	Swampscott	Surface Water	4	15,300	Yes
66	FAIRHAVEN WATER DEPT Fairhaven	Fairhaven	Groundwater	4	15,155	Yes
67	KINGSTON WATER DEPARTMENT Kingston	Kingston	Groundwater	4	14,715	Yes
68	HAMILTON WATER DEPT Hamilton	Hamilton	Groundwater	4	7,674	Yes
69	PALMER WATER DISTRICT NO.1 Palmer	Palmer	Surface Water	4	4,789	Yes
70	NAHANT WATER DEPT. (MWRA) Nahant	Nahant	Surface Water	4	3,334	Yes
71	MCI BRIDGEWATER Milford	Milford	Surface Water	4	2,802	Yes
72	REGENCY AT STOW CONDOMINIUMS Bedford	Bedford	Groundwater	4	132	Yes
73	QUINCY WATER DEPT. (MWRA) Quincy	Quincy	Surface Water	3	106,000	Yes
74	FRAMINGHAM WATER DEPT. (MWRA) Framingham	Framingham	Surface Water	3	72,362	Yes
75	PEABODY WATER DEPT. West Peabody	West Peabody	Surface Water	3	54,481	Yes
76	ARLINGTON WATER DEPT. (MWRA) Arlington	Arlington	Surface Water	3	46,308	Yes
77	WOBURN WATER DEPT. Woburn	Woburn	Surface Water	3	40,876	Yes
78	AMHERST DPW WATER DIVISION Amherst	Amherst	Surface Water	3	39,263	Yes
79	ANDOVER WATER DEPT Andover	Andover	Surface Water	3	36,569	Yes
80	NEEDHAM WATER DEPT Needham	Needham	Surface Water	3	31,664	Yes
81	READING WATER DEPARTMENT (MWRA) Reading	Reading	Surface Water	3	26,262	Yes
82	MARBLEHEAD WATER DEPT. (MWRA) Marblehead	Marblehead	Surface Water	3	20,441	Yes
83	WAREHAM FIRE DISTRICT Parkwood Beach	Parkwood Beach	Groundwater	3	20,102	Yes
84	PEMBROKE WATER DIVISION DPW Pembroke	Pembroke	Groundwater	3	18,175	Yes
85	MEDFIELD WATER DEPT. Medfield	Medfield	Groundwater	3	12,713	Yes
86	UXBRIDGE DPW, WATER DIVISION Uxbridge	Uxbridge	Groundwater	3	11,612	Yes
87	WHITINSVILLE WATER COMPANY Whitinsville	Whitinsville	Surface Water	3	7,899	Yes
88	MERRIMAC WATER DEPARTMENT Merrimac	Merrimac	Groundwater	3	6,988	Yes
89	MARION WATER DIVISION Marion	Marion	Groundwater	3	6,119	Yes
90	MANCHESTER BY THE SEA DPW Manchester By The Sea	Manchester By The Sea	Surface Water	3	5,201	Yes
91	LYNNFIELD WATER DIST. (MWRA) Lynnfield	Lynnfield	Surface Water	3	4,820	Yes
92	STURBRIDGE WATER DEPARTMENT Sturbridge	Sturbridge	Surface Water	3	4,746	Yes
93	AQUARION WATER COMPANY (DOVER) Millbury	Millbury	Groundwater	3	1,929	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	89,143	Yes
98	ATTLEBORO WATER DEPT Attleboro	Attleboro	Surface Water	2	46,461	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	WESTBOROUGH WATER DEPARTMENT Westborough	Westborough	Surface Water	2	21,567	Yes
104	GARDNER WATER DEPARTMENT Gardner	Gardner	Surface Water	2	21,381	Yes
105	NEWBURYPORT WATER DEPARTMENT Newburyport	Newburyport	Surface Water	2	20,335	Yes
106	ASHLAND WATER AND SEWER DEPT. Ashland	Ashland	Groundwater	2	18,832	Yes
107	CLINTON WATER DEPT Clinton	Clinton	Surface Water	2	15,428	Yes
108	NORTH ADAMS WATER DEPT North Adams	North Adams	Surface Water	2	13,000	Yes
109	AUBURN WATER DISTRICT Auburn	Auburn	Surface Water	2	12,255	Yes
110	HANSCOM AFB Hanscom Afb	Hanscom Afb	Surface Water	2	11,789	Yes
111	HOLBROOK PUBLIC WORKS DEPT Holbrook	Holbrook	Surface Water	2	11,405	Yes
112	ROCKPORT WATER DEPT Rockport	Rockport	Surface Water	2	10,000	Yes
113	PEPPERELL DPW WATER DIVISION Pepperell	Pepperell	Groundwater	2	9,217	Yes
114	GEORGETOWN WATER DEPARTMENT Georgetown	Georgetown	Groundwater	2	8,766	Yes
115	STERLING WATER DEPARTMENT Sterling	Sterling	Groundwater	2	6,715	Yes
116	HOPEDALE WATER DEPARTMENT Hopedale	Hopedale	Surface Water	2	6,017	Yes
117	OTIS AIR NATIONAL GUARD BASE Buzzards Bay	Buzzards Bay	Groundwater	2	6,000	Yes
118	WINCHENDON WATER DEPARTMENT Winchendon	Winchendon	Surface Water	2	5,706	Yes
119	LINCOLN WATER DEPT Lincoln	Lincoln	Surface Water	2	5,593	Yes
120	TOPSFIELD WATER DEPARTMENT Topsfield	Topsfield	Groundwater	2	5,435	Yes
121	TOWN OF AVON Avon	Avon	Groundwater	2	4,777	Yes
122	NORTH BROOKFIELD WATER DEPARTMENT North Brookfield	North Brookfield	Surface Water	2	3,863	Yes
123	MCI SHIRLEY Milford	Milford	Groundwater	2	3,500	Yes
124	BERNARDSTON FIRE WATER DIST Bernardston	Bernardston	Groundwater	2	1,471	Yes
125	RUSSELL WATER DEPT Russell	Russell	Groundwater	2	1,228	Yes
126	HINSDALE WATER DEPT Hinsdale	Hinsdale	Surface Water	2	1,000	Yes
127	PINE VALLEY PLANTATION Belchertown	Belchertown	Groundwater	2	600	Yes
128	MONTAGUE CENTER WATER DISTRICT Montague	Montague	Groundwater	2	450	Yes
129	HARVARD RIDGE CONDOMINIUM Bedford	Bedford	Groundwater	2	350	Yes
130	PINETREE VILLAGE Carver	Carver	Groundwater	2	348	Yes
131	THE RESERVE AT SPRING HILL Rehoboth	Rehoboth	Groundwater	2	300	Yes
132	GLENGARRY CONDOS Amesbury	Amesbury	Groundwater	2	171	Yes
133	WESTPORT SENIOR VILLAGE Westport	Westport	Groundwater	2	150	Yes
134	GREEN VALLEY MOBILE HOME PARK Lunenburg	Lunenburg	Groundwater	2	127	Yes
135	LEINO PARK WATER DISTRICT Westminster	Westminster	Surface Water	2	120	Yes
136	SPORTS HAVEN MOBILE HOME PARK Belchertown	Belchertown	Groundwater	2	107	Yes
137	COUNTRY ACRES ESTATES, LLC Pittsfield	Pittsfield	Groundwater	2	100	Yes
138	MARLIN VILLAGE MOBILE HOME PARK Wellesley	Wellesley	Groundwater	2	95	Yes
139	HARDWICK CENTER WATER DISTRICT Gilbertville	Gilbertville	Groundwater	2	80	Yes
140	NORTHBROOK VILLAGE II Wellesley	Wellesley	Groundwater	2	80	Yes
141	THE PRESERVE AT HOPKINTON CONDO Boylston	Boylston	Groundwater	2	80	Yes
142	CADY BROOK CROSSING CONDOMINIUMS Shrewbury	Shrewbury	Groundwater	2	75	Yes
143	COOL SANDY BEACH COMMUNITY WATER SYSTEM Rutland	Rutland	Groundwater	2	70	Yes
144	FAIRHAVEN MOBILE HOME PARK Lunenburg	Lunenburg	Groundwater	2	63	Yes
145	WASHINGTON NORTH MHP Andover	Andover	Groundwater	2	63	Yes
146	PINE HILL VILLAGE CONDOMINIUMS Tyngsborough	Tyngsborough	Groundwater	2	60	Yes
147	HAWTHORNE VILLAGE Southboro	Southboro	Groundwater	2	55	Yes
148	BOSTON WATER AND SEWER COMMISSION (MWRA) Boston	Boston	Surface Water	1	675,647	Yes
149	WORCESTER DPWP, WATER SUPPLY DIVISION Worcester	Worcester	Surface Water	1	206,518	Yes
150	FALL RIVER WATER DEPARTMENT Fall River	Fall River	Surface Water	1	94,000	Yes
151	WEYMOUTH WATER DEPARTMENT Weymouth	Weymouth	Surface Water	1	57,871	Yes
152	PITTSFIELD DPU WATER DEPT Pittsfield	Pittsfield	Surface Water	1	43,927	Yes
153	FITCHBURG DPW DIVISION OF WATER SUPPLY Fitchburg	Fitchburg	Surface Water	1	41,946	Yes
154	DEDHAM WESTWOOD WATER DIST. Dedham	Dedham	Surface Water	1	41,630	Yes
155	MILFORD WATER DEPARTMENT Milford	Milford	Surface Water	1	30,379	Yes
156	WELLESLEY WATER DIVISION Wellesley	Wellesley	Surface Water	1	29,550	Yes
157	STOUGHTON WATER DEPARTMENT Stoughton	Stoughton	Surface Water	1	29,281	Yes
158	WANNACOMET WATER COMPANY Nantucket	Nantucket	Groundwater	1	27,703	Yes
159	WALPOLE WATER DEPT Walpole	Walpole	Groundwater	1	24,070	Yes
160	PROVINCETOWN WATER DEPARTMENT Provincetown	Provincetown	Groundwater	1	22,250	Yes
161	SUDBURY WATER DISTRICT Sudbury	Sudbury	Groundwater	1	18,416	Yes
162	HOLDEN WATER DIVISION, DPW Holden	Holden	Surface Water	1	18,016	Yes
163	WEBSTER WATER DEPARTMENT Webster	Webster	Groundwater	1	17,776	Yes
164	GREENFIELD WATER DEPARTMENT Greenfield	Greenfield	Surface Water	1	17,768	Yes
165	EAST BRIDGEWATER WATER DEPT East Bridgewater	East Bridgewater	Groundwater	1	14,526	Yes
166	MEDWAY WATER DEPARTMENT Medway	Medway	Groundwater	1	14,176	Yes
167	WAYLAND WATER DEPARTMENT Wayland	Wayland	Groundwater	1	14,096	Yes
168	SEEKONK WATER DISTRICT Seekonk	Seekonk	Groundwater	1	13,801	Yes
169	IPSWICH DPU WATER DEPT Ipswich	Ipswich	Surface Water	1	13,138	Yes
170	WARE WATER DEPT Ware	Ware	Groundwater	1	10,066	Yes
171	BLACKSTONE WATER DEPARTMENT Blackstone	Blackstone	Groundwater	1	9,463	Yes
172	WILBRAHAM WATER DEPT (MWRA) Wilbraham	Wilbraham	Surface Water	1	8,533	Yes
173	MATTAPOISETT WATER DEPARTMENT Mattapoisett	Mattapoisett	Groundwater	1	7,685	Yes
174	NORFOLK WATER DIVISION Norfolk	Norfolk	Groundwater	1	7,602	Yes
175	COHASSET WATER DEPT Cohasset	Cohasset	Surface Water	1	7,555	Yes
176	SPENCER WATER DEPARTMENT Spencer	Spencer	Groundwater	1	7,037	Yes
177	DEVENS MASSDEVELOPMENT Devens	Devens	Groundwater	1	6,500	Yes
178	SOUTH HADLEY FIRE DISTRICT #2 WATER DEPT South Hadley	South Hadley	Groundwater	1	6,200	Yes
179	TISBURY WATER WORKS Tisbury	Tisbury	Groundwater	1	6,082	Yes
180	LANCASTER WATER DEPARTMENT Lancaster	Lancaster	Groundwater	1	6,000	Yes
181	LEE WATER DEPT Lee	Lee	Surface Water	1	5,686	Yes
182	DUDLEY WATER DEPARTMENT Dudley	Dudley	Groundwater	1	5,515	Yes
183	ONSET FIRE DISTRICTWATER DEPT. Onset	Onset	Groundwater	1	5,392	Yes
184	SOUTHAMPTON WATER DEPT Southampton	Southampton	Surface Water	1	4,853	Yes
185	WENHAM WATER DEPT. Wenham	Wenham	Groundwater	1	3,942	Yes
186	ASHBURNHAM WATER DEPARTMENT Ashburnham	Ashburnham	Surface Water	1	3,680	Yes
187	BOYLSTON WATER DISTRICT Boylston	Boylston	Groundwater	1	3,343	Yes
188	WELLESLEY COLLEGE Wellesley	Wellesley	Groundwater	1	3,000	Yes
189	STOCKBRIDGE WATER DEPT Stockbridge	Stockbridge	Surface Water	1	2,800	Yes
190	BARRE WATER DEPARTMENT Barre	Barre	Groundwater	1	2,610	Yes
191	LANESBOROUGH FIRE AND WATER DISTRICT Lanesborough	Lanesborough	Surface Water	1	2,342	Yes
192	WARREN WATER DISTRICT Warren	Warren	Groundwater	1	2,289	Yes
193	MCI NORFOLK/CEDAR JUNCTION/WALPOLE Milford	Milford	Groundwater	1	2,200	Yes
194	HARVARD WATER DEPARTMENT Harvard	Harvard	Groundwater	1	1,422	Yes
195	GILBERTVILLE WATER DISTRICT Gilbertville	Gilbertville	Groundwater	1	1,089	Yes
196	EGREMONT WATER DEPT South Egremont	South Egremont	Surface Water	1	1,000	Yes
197	WEST WARREN WATER DISTRICT West Warren	West Warren	Groundwater	1	927	Yes
198	NORTHFIELD WATER DISTRICT Northfield	Northfield	Groundwater	1	800	Yes
199	SOUTH MEADOW VILLAGE Carver	Carver	Groundwater	1	750	Yes
200	WELLFLEET MUNICIPAL WATER SYSTEM Wellfleet	Wellfleet	Groundwater	1	750	Yes
201	CRANBERRY VILLAGE RESIDENTS ASSOCIATION Carver	Carver	Groundwater	1	414	Yes
202	ASHFIELD WATER DISTRICT Ashfield	Ashfield	Groundwater	1	400	Yes
203	MILLBURY IND. PARK/ PARK HILL VILLAGE Millbury	Millbury	Surface Water	1	400	Yes
204	WHEELWRIGHT WATER DISTRICT Wheelwright	Wheelwright	Groundwater	1	300	Yes
205	EAGLE HILL SCHOOL Hardwick	Hardwick	Groundwater	1	300	Yes
206	NORTH CARVER WATER DISTRICT Carver	Carver	Groundwater	1	300	Yes
207	WHITE PINES CONDOMINIUMS Lenox	Lenox	Groundwater	1	225	Yes
208	SEA OAKS CONDOMINIUMS Barnstable	Barnstable	Groundwater	1	222	Yes
209	BRIGGSVILLE WATER DISTRICT Clarksburg	Clarksburg	Groundwater	1	180	Yes
210	JAKES PATH PWS Middleborough	Middleborough	Groundwater	1	168	Yes
211	AQUARION WATER CO. (SPRINGDALE FARMS) Millbury	Millbury	Groundwater	1	126	Yes
212	WINNSTOCK CONDOS N Quincy	N Quincy	Groundwater	1	125	Yes
213	LANCASTER WOODS CONDOMINIUMS Westborough	Westborough	Groundwater	1	120	Yes
214	COLONY HEIGHTS CONDOMINIUM Tyngsborough	Tyngsborough	Groundwater	1	120	Yes
215	CRAWFORD HILLS Arlington	Arlington	Groundwater	1	118	Yes
216	TWIN ELLS MOBILE HOME PARK Pittsfield	Pittsfield	Groundwater	1	108	Yes
217	PINE HILL CONDOMINIUM Worcester	Worcester	Groundwater	1	95	Yes
218	WILLOW GROVE TRAILER PARK Lawrence	Lawrence	Groundwater	1	88	Yes
219	LIBERTY HOUSE CONDOMINIUM Acton	Acton	Groundwater	1	80	Yes
220	CRESCENT VALLEY CONDOS West Springfield	West Springfield	Groundwater	1	78	Yes
221	MOUNTAIN VIEW MHP Andover	Andover	Groundwater	1	75	Yes
222	BOLTON COUNTRY MANOR Worcester	Worcester	Groundwater	1	60	Yes
223	BENCHMARK CONDOMINIUMS Tyngsborough	Tyngsborough	Groundwater	1	60	Yes
224	ELIZABETH BROOK APARTMENTS Stow	Stow	Groundwater	1	54	Yes

Systems with No Violations (276)

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

MWRA (2,580,000) 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) TAUNTON WATER DIVISION (62,165) HAVERHILL WATER DEPT (61,277) 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 (47,100) RANDOLPH/HOLBROOK JOINT WATER BOARD (46,519) WEIR RIVER WATER SYSTEM (45,339) SALEM WATER DEPARTMENT (44,480) MARLBOROUGH DPW WATER DIV. (MWRA) (41,799) HARWICH WATER DEPARTMENT (39,144) BRAINTREE WATER AND SEWER DEPT. (39,143) SHREWSBURY WATER DEPARTMENT (38,325) HOLYOKE WATER WORKS (37,838) GLOUCESTER PUBLIC UTILITY DIVISION (37,440) NATICK WATER AND SEWER DIVISION (37,006) MASHPEE WATER DISTRICT (36,922) RANDOLPH WATER DEPARTMENT (35,114) HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE (35,000) BREWSTER WATER DEPARTMENT (35,000) FRANKLIN WATER DEPARTMENT (33,706) NORTH ATTLEBORO WATER DEPT (31,410) NORTH ANDOVER WATER DEPT (30,915) CHATHAM WATER DEPARTMENT (30,000) MATTAPOISETT RIVER VALLEY W.D. (29,600) 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 (25,864) DRACUT WATER SUPPLY DISTRICT (25,808) EASTON WATER DIV (25,058) OAK BLUFFS WATER DISTRICT (24,000) SANDWICH WATER DISTRICT (23,000) WINCHESTER WATER DEPT (22,970) CANTON WATER DEPT (22,766) BOURNE WATER DISTRICT (22,500) MANSFIELD WATER DIVISION (21,797) ACTON WATER SUPPLY DISTRICT (21,285) HUDSON WATER SUPPLY (20,032) SOUTHBRIDGE WATER DEPARTMENT (19,562) +226 more

All Water Systems in Massachusetts (564)

Page 1 of 12, ordered by population served.

System	Population Served	Violations
MWRA	2,580,000	0
BOSTON WATER AND SEWER COMMISSION (MWRA)	675,647	1
WORCESTER DPWP, WATER SUPPLY DIVISION	206,518	1
SPRINGFIELD WATER AND SEWER COMMISSION	169,170	27
LOWELL REGIONAL WATER UTILITY	120,418	7
CAMBRIDGE WATER DEPARTMENT	118,214	0
QUINCY WATER DEPT. (MWRA)	106,000	3
BROCKTON WATER DEPARTMENT	105,788	5
INIMA USA / AQUARIA LLC	105,643	0
LYNN WATER AND SEWER COMM	101,253	0
CITY OF NEW BEDFORD DPI	101,079	0
FALMOUTH WATER DEPT	97,551	6
FALL RIVER WATER DEPARTMENT	94,000	1
SALEM AND BEVERLY WATER SUPPLY BOARD	90,330	0
LAWRENCE WATER WORKS	89,143	2
NEWTON WATER DEPT. (MWRA)	88,931	4
SOMERVILLE WATER DEPT. (MWRA)	81,045	7
FRAMINGHAM WATER DEPT. (MWRA)	72,362	3
MALDEN WATER DIVISION (MWRA)	66,263	7
WALTHAM WATER DEPARTMENT	65,218	5
DENNIS WATER DISTRICT	65,000	0
BROOKLINE WATER AND SEWER DIVISION	63,191	4
REVERE WATER DIVISION (MWRA)	62,186	5
TAUNTON WATER DIVISION	62,165	0
MEDFORD WATER DEPT. (MWRA)	61,700	8
HAVERHILL WATER DEPT	61,277	0
WEYMOUTH WATER DEPARTMENT	57,871	1
UPPER CAPE REGIONAL WATER COOPERATIVE	56,250	0
CHICOPEE WATER DEPT (MWRA)	55,560	0
PEABODY WATER DEPT.	54,481	3
METHUEN WATER DEPT	53,059	0
CENTERVILLE OSTERVILLE MARSTONS MILLS WD	50,000	0
EVERETT WATER DEPT. (MWRA)	49,075	6
BEVERLY WATER DEPT	47,461	0
PLYMOUTH WATER DEPARTMENT	47,100	0
RANDOLPH/HOLBROOK JOINT WATER BOARD	46,519	0
ATTLEBORO WATER DEPT	46,461	2
ARLINGTON WATER DEPT. (MWRA)	46,308	3
WEIR RIVER WATER SYSTEM	45,339	0
SALEM WATER DEPARTMENT	44,480	0
PITTSFIELD DPU WATER DEPT	43,927	1
BILLERICA WATER WORKS	42,119	7
FITCHBURG DPW DIVISION OF WATER SUPPLY	41,946	1
MARLBOROUGH DPW WATER DIV. (MWRA)	41,799	0
LEOMINSTER WATER DIVISION	41,683	5
DEDHAM WESTWOOD WATER DIST.	41,630	1
WESTFIELD DPWWATER DIVISION	41,094	2
WOBURN WATER DEPT.	40,876	3
CHELSEA WATER DEPT. (MWRA)	40,787	7
AMHERST DPW WATER DIVISION	39,263	3

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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 9,972,169 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.

How many health-based violation records are in this extract for Massachusetts?

PlainEnviro's health-based EPA SDWIS extract contains 1,140 records joined to 564 active community water systems in Massachusetts. Monitoring and reporting records are not included.

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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

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

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