Massachusetts utilities with moderately hard water.

61 to 120 mg/L (3.6 to 7 grains per gallon). 50 utilities serving 556,911 people as they report it, largest first.

All 50, by people served

Massachusetts utilities with moderately hard water, 1 to 50
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Cambridge Water Department	Cambridge	118,214	72	4.2
Lynn Water and Sewer Comm	Lynn	101,253	63	3.7
Billerica Water Works	Billerica	42,119	66	3.8
Woburn Water Dept.	Woburn	40,876	99	5.8
Abington/Rockland Joint WTR. Works	Abington	33,387	73	4.3
Needham Water Dept	Needham	31,664	92	5.4
West Springfield DPW Water Division	West Springfield	28,835	108	6.3
Wakefield Water Dept	Wakefield	27,090	61	3.6
Canton Water Dept	Canton	22,766	80	4.6
Seekonk Water District	Seekonk	13,801	73	4.2
Lenox DPW Water Division	Lenox	9,800	78	4.5
Georgetown Water Department	Georgetown	8,766	86	5
Halifax Water Department	Halifax	7,575	72	4.2
Spencer Water Department	Spencer	7,037	70	4.1
Orange Water Dept	Orange	6,526	77	4.5
Groveland Water Department	Groveland	6,508	87	5.1
Dalton Fire District	Dalton	6,330	75	4.4
South Hadley Fire District #2 Water Dept	South Hadley	6,200	87	5.1
Rowley Water Department	Rowley	6,161	93	5.4
Lancaster Water Department	Lancaster	6,000	77	4.5
Groton Water Department	Groton	5,017	86	5
Town of Avon	Avon	4,777	84	4.9
Sturbridge Water Department	Sturbridge	4,746	85	5
West Newbury Water Department	West Newbury	4,704	90	5.2
Tewksbury Hospital	Tewksbury	2,500	104	6.1
East Brookfield Water Department	East Brookfield	1,526	68	4
Clark Shores Water Corporation	Lakeville	350	119	7
Dunstable Water Department	Dunstable	337	92	5.4
Pleasant Water	Wellfleet	200	84	4.9
Jakes Path PWS	Middleborough	168	76	4.4
Staffordshire Country Estates	Leicester	140	100	5.8
Monterey Water Company	Monterey	138	102	6
Willows at Boxford	Boxford	132	73	4.3
Woodland Ridge	Shirley	125	85	5
Fields at Sherborn Condo Trust	Sherborn	110	104	6.1
Rockwood Meadows	Upton	110	91	5.3
Waterview Park LLC	Carver	102	91	5.3
Carver Municipal Buildings	Carver	100	63	3.7
Enclave at Boxborough	Boxborough	100	61	3.6
Pine Ridge Condominiums at Sampsons Pond	Carver	89	75	4.4
Stones Throw Condos	Truro	80	83	4.9
Brookside Mobile Home Park	Acushnet	67	93	5.4
Benchmark Condominiums	Tyngsborough	60	85	4.9
Mount St Marys Abbey	Wrentham	60	74	4.3
Elizabeth Brook Apartments	Stow	54	107	6.3
The Village at Shepley Hill	Groton	52	114	6.7
Wellfleet Apartments	Wellfleet	48	75	4.4
Craftsman Village Condominiums	Harvard	40	61	3.5
Foxglove Apartments	Harvard	40	94	5.5
Mendon Housing Authority	Mendon	31	66	3.9

Source: Massachusetts Department of Environmental Protection, Drinking Water Program, 287 utilities, results from Jan. 5, 2015 to Sept. 23, 2026, read Oct. 10, 2026. Each sampling point is taken at its median; a figure is typical where every point falls in one band.

Also: 1 utility’s own water quality reports, read by hand, each named on the utility’s page.

Bands are the U.S. Geological Survey’s, at 17.1 mg/L to the grain. People served is what each utility reports; where one sells water to another, the same people can be counted twice. How hardness is measured here.

All 50, by people served

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