Massachusetts utilities whose water varies in hardness.

Water in more than one band, depending on where or when it was sampled: each is given as its range, softest to hardest. 95 utilities serving 1.4 million people as they report it, largest first.

All 95, by people served

Massachusetts utilities whose water varies in hardness, 1 to 95
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Haverhill Water Dept	Haverhill	61,277	27 to 60	1.6 to 3.5
Peabody Water Dept.	Peabody	54,481	59 to 310	3.4 to 18.1
Plymouth Water Department	Plymouth	47,100	8 to 75	0.5 to 4.4
Weir River Water System	Hingham	45,339	108 to 123	6.3 to 7.2
Dedham Westwood Water Dist.	Dedham	41,630	91 to 161	5.3 to 9.4
Westfield Dpwwater Division	Westfield	41,094	8 to 121	0.5 to 7
Amherst DPW Water Division	Amherst	39,263	6.9 to 88	0.4 to 5.1
Natick Water and Sewer Division	Natick	37,006	90 to 157	5.3 to 9.2
Marshfield Water Department	Marshfield	34,000	39 to 124	2.3 to 7.3
Franklin Water Department	Franklin	33,706	37 to 91	2.2 to 5.3
North Attleboro Water Dept	North Attleborough	31,410	49 to 91	2.8 to 5.3
Northampton Water Division	Northampton	29,571	21 to 64	1.2 to 3.7
Stoughton Water Department	Stoughton	29,281	31 to 64	1.8 to 3.7
Chelmsford Water District	Chelmsford	28,750	61 to 202	3.6 to 11.8
Bridgewater Water Department	Bridgewater	28,633	56 to 67	3.3 to 3.9
Danvers Water Dept.	Danvers	28,087	32 to 168	1.9 to 9.8
Wannacomet Water Company	Nantucket	27,703	42 to 78	2.5 to 4.6
Burlington Water Dept	Burlington	25,864	14 to 189	0.8 to 11.1
Dracut Water Supply District	Dracut	25,808	39 to 73	2.3 to 4.3
Easton Water Div	Easton	25,058	46 to 121	2.7 to 7.1
Walpole Water Dept	Walpole	24,070	56 to 69	3.3 to 4
Mansfield Water Division	Mansfield	21,797	29 to 74	1.7 to 4.3
Westborough Water Department	Westborough	21,567	44 to 129	2.6 to 7.5
Acton Water Supply District	Acton	21,285	48 to 115	2.8 to 6.7
Newburyport Water Department	Newburyport	20,335	47 to 152	2.7 to 8.9
Scituate Water Division	Scituate	19,297	36 to 98	2.1 to 5.7
Norton Water Department	Norton	19,161	37 to 63	2.1 to 3.7
Westford Water Department	Westford	18,848	56 to 111	3.3 to 6.5
Concord Water Dept	Concord	18,788	21 to 133	1.2 to 7.8
Foxboro Water Department	Foxborough	18,721	32 to 69	1.9 to 4
Sudbury Water District	Sudbury	18,416	62 to 188	3.6 to 11
Webster Water Department	Webster	17,776	39 to 79	2.3 to 4.6
Sharon Water Dept	Sharon	16,846	28 to 150	1.6 to 8.8
Bellingham DPW Water Sewer Division	Bellingham	16,556	43 to 66	2.5 to 3.9
Easthampton Water Dept	Easthampton	16,211	110 to 140	6.4 to 8.2
Middleborough Water Supply	Middleborough	15,350	27 to 75	1.6 to 4.4
Holliston Water Department	Holliston	15,139	43 to 88	2.5 to 5.2
Hanover Water Dept	Hanover	14,984	53 to 201	3.1 to 11.8
Bedford Water Dept.	Bedford	14,955	31 to 70	1.8 to 4.1
Kingston Water Department	Kingston	14,715	23 to 83	1.4 to 4.8
East Bridgewater Water Dept	East Bridgewater	14,526	58 to 66	3.4 to 3.8
Wayland Water Department	Wayland	14,096	103 to 129	6 to 7.5
Ipswich Dpu Water Dept	Ipswich	13,138	54 to 231	3.1 to 13.5
North Adams Water Dept	North Adams	13,000	58 to 213	3.4 to 12.5
Medfield Water Dept.	Medfield	12,713	43 to 140	2.5 to 8.2
Hopkinton Water Department	Hopkinton	12,680	36 to 95	2.1 to 5.6
Auburn Water District	Auburn	12,255	48 to 262	2.8 to 15.3
Wrentham Water Division	Wrentham	12,190	45 to 86	2.6 to 5
Norwell Water Department	Norwell	11,495	49 to 93	2.8 to 5.4
Aquarion Water Company, Millbury	Millbury	11,368	49 to 100	2.9 to 5.8
Raynham Center Water District	Raynham	10,964	58 to 83	3.4 to 4.8
Maynard DPW, Water Division	Maynard	10,746	36 to 179	2.1 to 10.5
Littleton Water Department	Littleton	9,334	32 to 88	1.9 to 5.1
Salisbury Water Division	Salisbury	9,334	66 to 144	3.8 to 8.4
Pepperell DPW Water Division	Pepperell	9,217	21 to 79	1.2 to 4.6
Millis Water Dept	Millis	9,055	46 to 155	2.7 to 9.1
Plainville Water Department	Plainville	8,805	53 to 92	3.1 to 5.4
Lynnfield Center Water District	Lynnfield	8,525	128 to 205	7.5 to 12
Ayer DPW Water Division	Ayer	8,479	104 to 212	6.1 to 12.4
Turners Falls Water Dept	Montague	8,080	26 to 110	1.5 to 6.4
North Chelmsford Water Dist	Chelmsford	7,660	68 to 249	4 to 14.6
Cohasset Water Dept	Cohasset	7,555	18 to 108	1 to 6.3
Aquarion Water Company Oxford	Oxford	7,384	46 to 73	2.7 to 4.3
Lunenburg Water District	Lunenburg	7,219	28 to 142	1.6 to 8.3
West Boylston Water District	West Boylston	6,919	25 to 62	1.4 to 3.6
Townsend Water Department	Townsend	6,832	34 to 66	2 to 3.8
Devens Massdevelopment	Ayer	6,500	129 to 216	7.5 to 12.6
Lincoln Water Dept	Lincoln	5,593	16 to 118	0.9 to 6.9
Topsfield Water Department	Topsfield	5,435	93 to 129	5.4 to 7.5
Manchester by the Sea DPW	Manchester	5,201	41 to 97	2.4 to 5.6
Cotuit Fire District Water Department	Barnstable	4,938	51 to 61	3 to 3.6
Hadley DPW Water Division	Hadley	4,819	116 to 137	6.8 to 8
Shirley Water District	Shirley	4,165	45 to 61	2.6 to 3.6
Cherry Valley/ Rochdale Water District	Leicester	3,696	28 to 63	1.7 to 3.7
Belchertown Water District	Belchertown	3,253	58 to 76	3.4 to 4.5
Leicester Water Supply District	Leicester	3,200	122 to 189	7.2 to 11.1
Hatfield Water Dept	Hatfield	3,164	27 to 97	1.6 to 5.7
Wellesley College	Wellesley	3,000	60 to 67	3.5 to 3.9
Wilkinsonville Water District	Sutton	2,773	49 to 110	2.8 to 6.4
Byfield Water District	Newbury	2,228	125 to 194	7.3 to 11.3
Aquarion Water Company (Dover)	Dover	1,929	27 to 97	1.6 to 5.7
Bolton Office Park Alta Nashoba Valley	Bolton	788	49 to 122	2.9 to 7.1
Manchaug Water District of Sutton	Sutton	476	18 to 88	1.1 to 5.1
Sawyer Hill Ecovillage	Berlin	272	122 to 194	7.1 to 11.3
White Pines Condominiums	Stockbridge	225	113 to 130	6.6 to 7.6
Pilot Grove Apartments	Stow	175	173 to 227	10.1 to 13.3
Harborside Village	Wellfleet	165	31 to 79	1.8 to 4.6
Trail Ridge Condominiums	Harvard	104	37 to 82	2.1 to 4.8
Estates at Highland Ridge	Hopkinton	100	100 to 137	5.8 to 8
Pine Hill Village Condominiums	Harvard	100	47 to 104	2.7 to 6.1
Curtis Hill Condominium	Tyngsborough	96	59 to 61	3.5 to 3.5
Bishops Landing Condominiums	Stoughton	50	54 to 108	3.2 to 6.3
Northbrook Village I / Berlin Ret.	Berlin	48	146 to 185	8.5 to 10.8
Saint Josephs Abbey	Spencer	45	0.1 to 134	0 to 7.8
Woodhaven Elder Housing Committee	Sherborn	30	3.9 to 625	0.2 to 36.5

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 95, by people served

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