Wisconsin 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. 124 utilities serving 559,647 people as they report it, largest first.

All 124, by people served

Wisconsin utilities whose water varies in hardness, 1 to 124
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
La Crosse Waterworks	La Crosse	53,000	64 to 390	3.7 to 22.8
Manitowoc Waterworks	Manitowoc	34,500	130 to 470	7.6 to 27.5
Stevens Point Waterworks	Stevens Point	26,717	140 to 205	8.2 to 12
South Milwaukee Waterworks	South Milwaukee	21,340	120 to 125	7 to 7.3
Wis Rapids Water Works & Lighting Comm	Wisconsin Rapids	20,000	60 to 63	3.5 to 3.7
Hudson Waterworks	Hudson	18,558	165 to 280	9.6 to 16.4
River Falls Waterworks	River Falls	16,000	175 to 205	10.2 to 12
Weston Municipal Utilities	Weston	16,000	97 to 210	5.7 to 12.3
Menomonie Waterworks	Menomonie	15,950	110 to 180	6.4 to 10.5
Fox Crossing Utilities West	Neenah	14,000	44 to 64	2.6 to 3.7
Baraboo Waterworks	Baraboo	12,703	148 to 329	8.7 to 19.2
Little Chute Waterworks	Little Chute	12,168	53 to 205	3.1 to 12
Burlington Waterworks	Burlington	11,043	110 to 245	6.4 to 14.3
New Richmond Waterworks	New Richmond	10,824	175 to 215	10.2 to 12.6
Portage Waterworks	Portage	10,437	109 to 144	6.3 to 8.4
Elkhorn Waterworks	Elkhorn	10,317	47 to 140	2.7 to 8.2
Sparta Waterworks	Sparta	10,025	46 to 186	2.7 to 10.8
Reedsburg Waterworks	Reedsburg	9,984	114 to 224	6.6 to 13.1
Merrill Waterworks	Merrill	9,661	97 to 145	5.7 to 8.5
Altoona Waterworks	Altoona	9,627	71 to 140	4.2 to 8.2
Tomah Waterworks	Tomah	9,192	39 to 132	2.3 to 7.7
Rice Lake Waterworks	Rice Lake	9,012	82 to 135	4.8 to 7.9
Rhinelander Water & Wastewater	Rhinelander	8,234	53 to 110	3.1 to 6.4
Muskego Water Utility	Muskego	8,150	51 to 400	3 to 23.4
New London Waterworks	New London	7,187	130 to 460	7.6 to 26.9
Village of Lake Hallie Waterworks	Chippewa Falls	6,701	28 to 130	1.6 to 7.6
Rib Mountain Water Utility	Wausau	6,398	59 to 150	3.5 to 8.8
Waupaca Waterworks	Waupaca	6,062	160 to 460	9.4 to 26.9
Berlin Waterworks	Berlin	5,524	92 to 285	5.4 to 16.7
Columbus Utilities	Columbus	5,173	113 to 164	6.6 to 9.6
Shawano Lk San Dist 1	Shawano	4,950	74 to 355	4.3 to 20.8
Suamico Waterworks	Suamico	4,697	87 to 235	5.1 to 13.7
Mauston Waterworks	Mauston	4,456	52 to 127	3 to 7.4
Baldwin Waterworks	Baldwin	4,440	180 to 200	10.5 to 11.7
Viroqua Waterworks	Viroqua	4,362	163 to 201	9.5 to 11.8
Medford Waterworks	Medford	4,318	135 to 470	7.9 to 27.5
Prescott Waterworks	Prescott	4,258	173 to 340	10.1 to 19.9
Village of Bloomfield	Pell Lake	4,071	17 to 139	1 to 8.1
Arcadia Waterworks	Arcadia	3,737	153 to 226	8.9 to 13.2
Black River Falls Waterworks	Black River Falls	3,608	17 to 125	1 to 7.3
Stanley Waterworks	Stanley	3,500	77 to 130	4.5 to 7.6
Barron Light & Water Dept	Barron	3,423	86 to 140	5 to 8.2
Peshtigo Waterworks	Peshtigo	3,420	155 to 235	9.1 to 13.7
Brillion Waterworks	Brillion	3,262	115 to 160	6.7 to 9.4
Freedom Sanitary District	Freedom	3,260	32 to 93	1.9 to 5.4
Wisconsin Dells Waterworks	Wisconsin Dells	3,232	81 to 174	4.7 to 10.2
Ladysmith Waterworks	Ladysmith	3,184	140 to 330	8.2 to 19.3
Park Falls Waterworks	Park Falls	2,993	110 to 160	6.4 to 9.4
Amery Waterworks	Amery	2,962	180 to 195	10.5 to 11.4
Lake Delton Waterworks	Lake Delton	2,914	88 to 142	5.1 to 8.3
Hayward Water Utility	Hayward	2,552	110 to 135	6.4 to 7.9
New Lisbon Waterworks	New Lisbon	2,526	64 to 149	3.7 to 8.7
Abbotsford Waterworks	Abbotsford	2,502	155 to 260	9.1 to 15.2
Lakeland Sanitary Dist 1	Minocqua	2,381	92 to 210	5.4 to 12.3
Cumberland Waterworks	Cumberland	2,311	145 to 205	8.5 to 12
Wautoma Water Dept	Wautoma	2,280	150 to 205	8.8 to 12
St Croix Falls Waterworks	St Croix Falls	2,079	160 to 190	9.4 to 11.1
Redgranite Waterworks	Redgranite	2,019	111 to 150	6.5 to 8.8
Chetek Waterworks	Chetek	1,931	45 to 62	2.6 to 3.6
Port Edwards Water Utility	Port Edwards	1,866	59 to 77	3.5 to 4.5
Spencer Waterworks	Spencer	1,848	120 to 190	7 to 11.1
Adams Waterworks	Adams	1,847	113 to 158	6.6 to 9.2
Colby Waterworks	Colby	1,829	125 to 230	7.3 to 13.5
Osseo Waterworks	Osseo	1,701	84 to 148	4.9 to 8.7
Galesville Waterworks	Galesville	1,679	113 to 131	6.6 to 7.7
Thorp Waterworks	Thorp	1,636	130 to 230	7.6 to 13.5
Eagle River Waterworks	Eagle River	1,530	120 to 125	7 to 7.3
Independence Waterworks	Independence	1,500	49 to 75	2.9 to 4.4
Edgar Waterworks	Edgar	1,491	106 to 254	6.2 to 14.9
Augusta Waterworks	Augusta	1,450	35 to 82	2 to 4.8
Spring Valley Waterworks	Spring Valley	1,409	169 to 186	9.9 to 10.8
Woodville Waterworks	Woodville	1,386	180 to 317	10.5 to 18.5
Cadott Waterworks	Cadott	1,352	66 to 127	3.9 to 7.4
Loyal Waterworks	Loyal	1,308	138 to 218	8.1 to 12.7
Blair Waterworks	Blair	1,280	51 to 84	3 to 4.9
Fall Creek Waterworks	Fall Creek	1,269	56 to 264	3.3 to 15.4
Frederic Waterworks	Frederic	1,241	140 to 190	8.2 to 11.1
Cashton Waterworks	Cashton	1,120	145 to 320	8.5 to 18.7
Glenwood City Waterworks	Glenwood City	1,102	150 to 242	8.8 to 14.2
Ashwood Grove Edgewater	Fond Du Lac	1,046	120 to 230	7 to 13.5
Owen Waterworks	Owen	936	86 to 145	5 to 8.5
Montreal Waterworks	Montreal	887	90 to 130	5.3 to 7.6
Hillcrest Estates MHP	Altoona	850	57 to 72	3.3 to 4.2
Necedah Waterworks	Necedah	844	53 to 64	3.1 to 3.7
Pittsville Waterworks	Pittsville	800	100 to 202	5.8 to 11.8
Elmwood Waterworks	Elmwood	798	174 to 277	10.1 to 16.2
Plain Waterworks	Plain	792	155 to 231	9 to 13.5
Mercer Sanitary District	Mercer	760	78 to 200	4.6 to 11.7
Wonewoc Waterworks	Wonewoc	758	96 to 164	5.6 to 9.6
Mellen Water Utility	Mellen	731	86 to 191	5 to 11.2
Bruce Waterworks	Bruce	620	167 to 185	9.7 to 10.8
North Freedom Waterworks	North Freedom	589	154 to 196	9 to 11.5
Phelps Sanitary District	Phelps	550	45 to 63	2.6 to 3.7
New Auburn Waterworks	New Auburn	549	30 to 86	1.8 to 5
Boyd Waterworks	Boyd	540	110 to 150	6.4 to 8.8
Melrose Waterworks	Melrose	524	113 to 149	6.6 to 8.7
Clark County Rehabilitation & Living Center	Owen	510	128 to 260	7.5 to 15.2
Drummond Sanitary District	Drummond	500	94 to 185	5.5 to 10.8
Knapp Waterworks	Knapp	486	180 to 257	10.5 to 15
Kendall Waterworks	Kendall	458	151 to 191	8.8 to 11.2
Coloma Waterworks	Coloma	454	150 to 195	8.8 to 11.4
Land O Lakes Sanitary Dist	Land O Lakes	450	25 to 64	1.5 to 3.7
Hixton Waterworks	Hixton	443	48 to 67	2.8 to 3.9
Cazenovia Waterworks	Cazenovia	351	162 to 195	9.5 to 11.4
Rainbow Lake Manor MHP	Bristol	350	180 to 200	10.5 to 11.7
Embarrass Waterworks	Embarrass	346	146 to 251	8.5 to 14.7
Winter Waterworks	Winter	344	112 to 184	6.5 to 10.8
Butternut Waterworks	Butternut	283	92 to 125	5.4 to 7.3
Maine Water Utility	Wausau	271	46 to 136	2.7 to 8
Maplewood Village	Appleton	225	164 to 873	9.6 to 51.1
Oakdale Estates MHP	Sturtevant	220	170 to 190	9.9 to 11.1
Kountry Aire Est MHP III	Mauston	210	94 to 180	5.5 to 10.5
Little Florida	Merrill	170	130 to 190	7.6 to 11.1
McNaughton Correctional Center	Lake Tomahawk	133	52 to 72	3 to 4.2
Eagle Chateau Apts	Kenosha	125	160 to 190	9.4 to 11.1
Flambeau Correctional Center	Hawkins	120	160 to 190	9.4 to 11.1
Plum City Care Center Nursing Home	Plum City	120	35 to 340	2 to 19.9
Wisconsin Academy Main Campus	Columbus	115	1.6 to 342	0.1 to 20
Oakwood Terrace	Portage	100	120 to 140	7 to 8.2
Rustic Acres MHP	Little Suamico	90	93 to 130	5.4 to 7.6
S and J Wild River MHP	Hayward	90	110 to 135	6.4 to 7.9
Baltic Rentals LLC	Eagle River	75	60 to 65	3.5 to 3.8
Parkview Apartments	Ixonia	45	0.7 to 450	0 to 26.3
Whispering Pines Apts	Salem	30	178 to 353	10.4 to 20.6

Source: Wisconsin Department of Natural Resources, Drinking Water Program, 940 utilities, results from Feb. 4, 2015 to Sept. 24, 2026, read Oct. 10, 2026. Each sampling point is taken at its median; a figure is typical where every point falls in one band.

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 124, by people served

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