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Is Wisconsin tap water hard or soft?

Yes, mostly. 84 % of the 448 cities with published data in Wisconsin have hard or very hard water (over 120 mg/L). The median is 14.3 gpg, from 0.8 gpg in Warrens to 36.8 gpg in Kaukauna.

We have published hardness data for 448 cities in Wisconsin. The median is 14.3 gpg; the hardest water is in Kaukauna (36.8 gpg), the softest in Warrens (0.8 gpg).

84 % of these cities have hard or very hard water (over 120 mg/L).

USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.

Each dot is a place with published data; colour shows the hardness band.

Largest places, hardest first

gpgmg/L
Kaukauna36.8630very hard
Slinger28.6490very hard
Kewaskum28480very hard
Monona26.9460very hard
Hartland26.3450very hard
Waterloo25.7440very hard
Germantown24.5420very hard
Hartford24.5420very hard
Delavan24.5420very hard
Plymouth24.3416very hard
Kiel24.2415very hard
West Bend23.9410very hard
McFarland23.7406very hard
Cross Plains22.7389very hard
Brookfield22.5385very hard
Manitowoc22.2380very hard
Cedarburg22.2380very hard
Mukwonago22.2380very hard
Saukville22.2380very hard
Waterford21.9375very hard
Lake Geneva21.6370very hard
Middleton21.3365very hard
Mount Horeb21.3364very hard
Milton21.2363very hard
Ripon21360very hard
East Troy21360very hard
Verona20.8357very hard
Onalaska20.5352very hard
Janesville20.4350very hard
Menomonee Falls20.4350very hard
Jackson20.4350very hard
Omro20.4350very hard
Ellsworth20.4350very hard
Cottage Grove20.4349very hard
Shawano20.2345very hard
La Crosse20343very hard
Madison19.9340very hard
Prescott19.9340very hard
Edgerton19.6336very hard
Beloit19.6336very hard
Muskego19.5334very hard
Lake Mills19.3330very hard
North Fond du Lac19.3330very hard
Evansville19.1327very hard
Prairie du Chien19326very hard
Fond du Lac19325very hard
Greenville19325very hard
Platteville18.8322very hard
Sun Prairie18.7320very hard
Watertown18.7320very hard
Oconomowoc18.7320very hard
Delafield18.7320very hard
Dodgeville18.7320very hard
Clintonville18.7320very hard
Waupaca18.4315very hard
Whitewater18.1310very hard
Stoughton18.1310very hard
Sturgeon Bay18.1310very hard
Oregon17.7304very hard
Marshall17.5300very hard
Holmen17.5299very hard
Fitchburg17.4298very hard
Sauk City17.1293very hard
Sussex16.9290very hard
Lancaster16.9290very hard
Fort Atkinson16.6285very hard
Pewaukee16.6285very hard
Waukesha16.4280very hard
Monroe16.4280very hard
Pulaski16.4280very hard
Seymour16.4280very hard
Johnson Creek16.4280very hard
DeForest16.3280very hard
Prairie du Sac16.2277very hard
Jefferson15.8270very hard
New London15.8270very hard
Windsor15.5265very hard
Mayville15.5265very hard
Waunakee15.2260very hard
Plover15.2260very hard
Berlin14.6250very hard
West Salem14.4246very hard
Medford14.3245very hard
Horicon14.3245very hard
Marshfield14240very hard
Bristol14240very hard
Baraboo13.1225very hard
Hudson12.9220very hard
Somerset12.9220very hard
Columbus12.3211very hard
Burlington12.3210very hard
Richland Center12.3210very hard
Antigo11.7200very hard
Peshtigo11.4195very hard
River Falls11.1190very hard
New Richmond11.1190very hard
Baldwin11.1190very hard
Viroqua10.6181very hard
Stevens Point10.5180very hard
Oshkosh9.9170hard
Weston9.9170hard
Oconto9.9170hard
Reedsburg9.4161hard
Suamico9.4161hard
Menomonie9.3160hard
Little Chute9.3160hard
Sparta9.3160hard
Chilton9.3160hard
Howard9154hard
Cudahy8.8150hard
Kronenwetter8.5145hard
Kenosha8.2140hard
Racine8.2140hard
West Allis8.2140hard
Pleasant Prairie8.2140hard
Glendale8.2140hard
Rothschild8.2140hard
Barron7.9135hard
Wrightstown7.8134hard
Milwaukee7.6130hard
Green Bay7.6130hard
Ashwaubenon7.6130hard
Stanley7.6130hard
Beaver Dam7.3125hard
Portage7.1122hard
South Milwaukee7120hard
Merrill7120hard
Altoona7120hard
Eau Claire6.4110moderately hard
Mauston6.3108moderately hard
Lake Delton6102moderately hard
Rice Lake5.899moderately hard
Kimberly5.696moderately hard
Union Grove5.288moderately hard
Chippewa Falls585moderately hard
Waupun4.882moderately hard
Tomahawk4.882moderately hard
Tomah4.475moderately hard
Rib Mountain4.475moderately hard
Appleton4.374moderately hard
Fox Crossing4.171moderately hard
Rhinelander4.171moderately hard
Wausau3.764moderately hard
Mosinee3.662moderately hard
Black River Falls3.560moderately hard
Elkhorn3.458soft
Wisconsin Rapids3.255soft
Ashland3.153soft
Bloomer2.746soft
Bloomfield117soft

Other places (298)

FAQ

Is Wisconsin water hard or soft?

Yes, mostly. 84 % of the 448 cities we cover have hard or very hard water; the median is 14.3 gpg.

Which city in Wisconsin has the hardest water?

Kaukauna, at 36.8 gpg, has the hardest water of the 448 cities with published data.

Which city in Wisconsin has the softest water?

Warrens, at 0.8 gpg, has the softest water of the 448 cities with published data.

Do I need a water softener in Wisconsin?

Above about 120 mg/L (7 gpg) scale builds up in water heaters, kettles and dishwashers, and a softener or at least regular descaling pays off. Look up your own city in the table: in Wisconsin the values range from 0.8 gpg to 36.8 gpg.

On a private well? Well water hardness in Wisconsin by county →

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