Wisconsin utilities with moderately hard water.

61 to 120 mg/L (3.6 to 7 grains per gallon). 81 utilities serving 308,460 people as they report it, largest first.

All 81, by people served

Wisconsin utilities with moderately hard water, 1 to 81
Utility	Based in	Serves	Hardness, mg/L	Grains per gallon
Appleton Waterworks	Menasha	74,511	79	4.6
Eau Claire Waterworks	Eau Claire	70,587	107	6.3
Wausau Waterworks	Wausau	39,994	75	4.4
Chippewa Falls Waterworks	Chippewa Falls	13,375	82	4.8
Darboy Sanitary Dist 1	Appleton	13,024	108	6.3
Fox Crossing Utilities East	Neenah	10,927	87	5.1
Fort McCoy North Post	Fort McCoy	10,000	96	5.6
Waupun Utilities	Waupun	8,056	81	4.7
Antigo Waterworks	Antigo	7,780	115	6.7
Kimberly Waterworks	Kimberly	7,608	93	5.4
Union Grove Waterworks	Union Grove	4,900	97	5.7
Mosinee Waterworks	Mosinee	3,406	90	5.3
Algoma Waterworks	Algoma	3,219	115	6.7
Tomahawk Waterworks	Tomahawk	3,180	89	5.2
Mondovi Waterworks	Mondovi	2,667	76	4.4
Spooner Waterworks	Spooner	2,653	101	5.9
Williams Bay Waterworks	Williams Bay	2,601	96	5.6
Winneconne Waterworks	Winneconne	2,502	93	5.5
Nekoosa Waterworks	Nekoosa	2,394	64	3.8
Neillsville Waterworks	Neillsville	2,384	90	5.2
Washburn Waterworks	Washburn	2,280	88	5.1
Whitehall Waterworks	Whitehall	1,820	110	6.4
Cameron Waterworks	Cameron	1,787	71	4.2
Phillips Waterworks	Phillips	1,473	104	6.1
Mosinee East System	Mosinee	1,046	100	5.8
Athens Waterworks	Athens	1,025	112	6.5
Laona Sanitary Dist	Laona	950	120	7
Elk Mound Waterworks	Elk Mound	895	87	5.1
Glidden Sanitary District	Glidden	750	89	5.2
Webster Waterworks	Webster	652	92	5.4
Greenleaf Waterworks	Greenleaf	650	85	5
Iron River Sanitary District	Iron River	600	87	5.1
Minong Waterworks	Minong	561	120	7
Ettrick Waterworks	Ettrick	536	75	4.4
Three Lakes Sanitary District	Three Lakes	500	95	5.5
Taylor Waterworks	Taylor	498	75	4.4
Holland TN Sanitary Dist	Town of Holland	495	99	5.8
Bayfield Waterworks	Bayfield	488	78	4.5
Dallas Waterworks	Dallas	365	83	4.9
Cedar Lake Home 5	West Bend	330	71	4.1
Recreacres Mhc LLC	Stevens Point	320	93	5.4
Oakdale Waterworks	Oakdale	317	118	6.9
Wheeler Waterworks Assoc	Wheeler	317	90	5.2
Pine Edge MHP	Eau Claire	300	63	3.7
Rock Springs Waterworks	Rock Springs	292	103	6
Danbury Sanitary District	Danbury	286	100	5.8
Union Center Waterworks	Union Center	225	83	4.9
Iron Belt Waterworks	Iron Belt	211	115	6.7
Exeland Waterworks	Exeland	196	68	4
Stone Lake Sanitary District	Stone Lake	175	89	5.2
Hustler Waterworks	Hustler	170	76	4.4
Marell Country Estates	Elk Mound	150	95	5.6
Richmond Estates	Shawano	150	105	6.1
Hoffmanns Wissota Court	Chippewa Falls	126	120	7
Green Oaks Mobile Home Court	Holmen	117	88	5.1
Andersons Trailer Court	Rice Lake	95	78	4.6
Cedar Falls Acres MHP	Menomonie	95	68	4
Kountry Aire Est MHP I	Mauston	90	87	5.1
Tainter Woods Condominiums	Colfax	85	91	5.3
Tamarack Health Hayward Medical Center	Hayward	85	81	4.7
Hiawatha Mh Estates Old Office	Arbor Vitae	84	74	4.3
Lakeland Village 1	Minocqua	81	100	5.8
Grand Ave Apartments	Thiensville	80	73	4.3
Bonnie Vale Park 1	Eau Claire	70	70	4.1
Lakeview Heights Mobile Home Park	Algoma	66	100	5.8
Mary Hill Park Sanitary Dist	Fond Du Lac	65	65	3.8
Oak Lane Mobile Home Park	Stevens Point	60	120	7
Vintage on the Ponds	Delavan	60	115	6.7
Patricia Lake Manufactured Housing Community	Minocqua	56	100	5.8
Hickory Shade	Wisconsin Rapids	55	107	6.3
Fishermans Paradise MHP	Rhinelander	54	110	6.4
Aspen Ridge	Marengo	50	120	7
Evergreen Estates	Arbor Vitae	50	69	4
Luedtkes Mobile Home Park	Hayward	50	100	5.8
Meadows Condominiums Assoc Ltd	Franklin	50	109	6.4
Northfield San Dist 1	Hixton	50	63	3.7
Rockwood Estates	Minocqua	48	76	4.4
Cedar Junction	Nekoosa	45	98	5.7
Hilly Haven LLC	Phillips	45	120	7
Pikes Bay Marina	Bayfield	45	70	4.1
Big Musky Resort	Hayward	25	92	5.4

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 81, by people served

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