Water hardness in Wisconsin
Typical Wisconsin tap water
170mg/L
9.9gpg
Hard
Population-weighted middle value across 126 Wisconsin cities in the dataset
We have hardness numbers for 112 Wisconsin cities; 7 of them are county estimates rather than utility figures. Each city page adds the water system's EPA violation record and a softener size for a typical household.
Dot size follows population. Tap a dot for the city page.
2Soft
13Moderately hard
33Hard
64Very hard
Hardest water in Wisconsin
- Slinger485
- Mequon440
- Hartford426
- Brookfield424
- Germantown422
- Monona420
- Cedarburg400
- Ripon385
Softest water in Wisconsin
All cities in Wisconsin
| City | mg/L | gpg | Class | Data | EPA health violations |
|---|---|---|---|---|---|
| Milwaukee | 135 | 7.9 | Hard | Utility report | 0 |
| Madison | 341 | 19.9 | Very hard | Utility report | 1 |
| Green Bay | 137 | 8.0 | Hard | Utility report | 0 |
| Kenosha | 140 | 8.2 | Hard | Utility report | 0 |
| Racine | 136 | 8.0 | Hard | Utility report | 0 |
| Appleton | 81 | 4.7 | Moderately hard | Utility report | 0 |
| Eau Claire | 101 | 5.9 | Moderately hard | Utility report | 0 |
| Waukesha | 326 | 19.1 | Very hard | Utility report | 160 |
| Oshkosh | 145 | 8.5 | Hard | Utility report | 0 |
| Janesville | 298 | 17.4 | Very hard | Utility report | 0 |
| West Allis | 135 | 7.9 | Hard | Utility report | 0 |
| La Crosse | 290 | 17.0 | Very hard | Utility report | 0 |
| Sheboygan | 202 | 11.8 | Very hard | Utility report | 0 |
| Wauwatosa | 134 | 7.8 | Hard | Utility report | 0 |
| Fond du Lac | 170 | 9.9 | Hard | Utility report | 0 |
| Brookfield | 424 | 24.8 | Very hard | Utility report | 7 |
| Menomonee Falls | 174 | 10.2 | Hard | Utility report | 1 |
| Wausau | 32 | 1.9 | Soft | Calculated from utility data | 0 |
| New Berlin | 330 | 19.3 | Very hard | County estimate | 0 |
| Sun Prairie | 337 | 19.7 | Very hard | Utility report | 1 |
| Oak Creek | 210 | 12.3 | Very hard | County estimate | 5 |
| Greenfield | 135 | 7.9 | Hard | Utility report | 0 |
| Franklin | 210 | 12.3 | Very hard | County estimate | 0 |
| Beloit | 333 | 19.5 | Very hard | Utility report | 2 |
| Manitowoc | 156 | 9.1 | Hard | Utility report | 0 |
| Fitchburg | 270 | 15.8 | Very hard | Utility report | 0 |
| West Bend | 340 | 19.9 | Very hard | County estimate | 0 |
| Mount Pleasant | 136 | 8.0 | Hard | Utility report | 0 |
| Neenah | 67 | 3.9 | Moderately hard | Utility report | 0 |
| Stevens Point | 173 | 10.1 | Hard | Utility report | 0 |
| Muskego | 276 | 16.1 | Very hard | Utility report | 1 |
| De Pere | 194 | 11.3 | Very hard | County estimate | 0 |
| Caledonia | 300 | 17.5 | Very hard | County estimate | 1 |
| Mequon | 440 | 25.7 | Very hard | Utility report | 0 |
| Middleton | 337 | 19.7 | Very hard | Utility report | 1 |
| Watertown | 249 | 14.6 | Very hard | Utility report | 0 |
| Pleasant Prairie | 140 | 8.2 | Hard | Utility report | 1 |
| Germantown | 422 | 24.7 | Very hard | Utility report | 1 |
| Onalaska | 337 | 19.7 | Very hard | Utility report | 0 |
| South Milwaukee | 210 | 12.3 | Very hard | County estimate | 0 |
| Oconomowoc | 310 | 18.1 | Very hard | Utility report | 0 |
| Fox Crossing | 166 | 9.7 | Hard | Utility report | 0 |
| Marshfield | 249 | 14.6 | Very hard | Utility report | 1 |
| Wisconsin Rapids | 62 | 3.6 | Moderately hard | Utility report | 0 |
| Menasha | 166 | 9.7 | Hard | Utility report | 0 |
| River Falls | 180 | 10.5 | Hard | Utility report | 1 |
| Cudahy | 142 | 8.3 | Hard | Utility report | 0 |
| Verona | 360 | 21.1 | Very hard | Utility report | 1 |
| Menomonie | 150 | 8.8 | Hard | Utility report | 0 |
| Waunakee | 282 | 16.5 | Very hard | Utility report | 0 |
| Pewaukee | 382 | 22.3 | Very hard | Utility report | 18 |
| Whitewater | 323 | 18.9 | Very hard | Utility report | 0 |
| Hartford | 426 | 24.9 | Very hard | Utility report | 0 |
| Weston | 136 | 8.0 | Hard | Utility report | 0 |
| Chippewa Falls | 49 | 2.9 | Soft | Utility report | 1 |
| Hudson | 210 | 12.3 | Very hard | Utility report | 1 |
| Glendale | 134 | 7.8 | Hard | Utility report | 0 |
| Whitefish Bay | 129 | 7.5 | Hard | Utility report | 0 |
| Plover | 260 | 15.2 | Very hard | Utility report | 1 |
| Allouez | 136 | 8.0 | Hard | Utility report | 1 |
| Shorewood | 130 | 7.6 | Hard | Utility report | 0 |
| Grafton | 370 | 21.6 | Very hard | Utility report | 0 |
| Greenville | 152 | 8.9 | Hard | Utility report | 0 |
| Stoughton | 312 | 18.2 | Very hard | Utility report | 0 |
| Baraboo | 240 | 14.0 | Very hard | Utility report | 0 |
| Suamico | 196 | 11.5 | Very hard | Utility report | 1 |
| DeForest | 280 | 16.4 | Very hard | Utility report | 1 |
| Cedarburg | 400 | 23.4 | Very hard | Utility report | 0 |
| Sussex | 332 | 19.4 | Very hard | Utility report | 44 |
| Fort Atkinson | 278 | 16.3 | Very hard | Utility report | 0 |
| Holmen | 319 | 18.6 | Very hard | Utility report | 2 |
| Oregon | 283 | 16.6 | Very hard | Utility report | 0 |
| Platteville | 297 | 17.4 | Very hard | Utility report | 0 |
| Little Chute | 87 | 5.1 | Moderately hard | Utility report | 1 |
| Two Rivers | 136 | 8.0 | Hard | Utility report | 1 |
| Lisbon | 332 | 19.4 | Very hard | Utility report | 44 |
| New Richmond | 194 | 11.3 | Very hard | Utility report | 0 |
| Burlington | 248 | 14.5 | Very hard | Utility report | 0 |
| Reedsburg | 162 | 9.5 | Hard | Utility report | 0 |
| Monroe | 261 | 15.2 | Very hard | Utility report | 0 |
| Elkhorn | 88 | 5.1 | Moderately hard | Utility report | 6 |
| Sturgeon Bay | 332 | 19.4 | Very hard | Utility report | 0 |
| Merrill | 116 | 6.8 | Moderately hard | Utility report | 1 |
| Altoona | 102 | 5.9 | Moderately hard | Utility report | 1 |
| Delavan | 360 | 21.1 | Very hard | Utility report | 0 |
| McFarland | 364 | 21.3 | Very hard | Utility report | 0 |
| St. Francis | 135 | 7.9 | Hard | Utility report | 0 |
| Cottage Grove | 347 | 20.3 | Very hard | Utility report | 1 |
| Rice Lake | 96 | 5.6 | Moderately hard | Utility report | 0 |
| Monona | 420 | 24.6 | Very hard | Utility report | 0 |
| Kronenwetter | 150 | 8.8 | Hard | Utility report | 1 |
| Jackson | 352 | 20.6 | Very hard | Utility report | 1 |
| Rhinelander | 76 | 4.5 | Moderately hard | Utility report | 1 |
| Jefferson | 280 | 16.4 | Very hard | Utility report | 7 |
| Ripon | 385 | 22.5 | Very hard | Utility report | 1 |
| New London | 279 | 16.3 | Very hard | Utility report | 0 |
| Kimberly | 73 | 4.2 | Moderately hard | Utility report | 1 |
| Lake Hallie | 61 | 3.6 | Moderately hard | Utility report | 1 |
| Rib Mountain | 90 | 5.3 | Moderately hard | Utility report | 0 |
| Sturtevant | 136 | 8.0 | Hard | Utility report | 0 |
| Lake Mills | 324 | 18.9 | Very hard | Utility report | 6 |
| Fox Point | 133 | 7.8 | Hard | Utility report | 0 |
| Slinger | 485 | 28.4 | Very hard | Utility report | 1 |
| Edgerton | 291 | 17.0 | Very hard | Utility report | 2 |
| Milton | 342 | 20.0 | Very hard | Utility report | 1 |
| Rothschild | 157 | 9.2 | Hard | Utility report | 1 |
| Berlin | 204 | 11.9 | Very hard | Utility report | 0 |
| Columbus | 144 | 8.4 | Hard | Utility report | 2 |
| Union Grove | 313 | 18.3 | Very hard | Utility report | 1 |
| Bristol | 270 | 15.8 | Very hard | Utility report | 0 |
| West Salem | 244 | 14.3 | Very hard | Utility report | 0 |
| Mayville | 324 | 18.9 | Very hard | Utility report | 0 |
Questions
Is Wisconsin water hard?
The typical Wisconsin resident gets about 170 mg/L (9.9 gpg), which is hard. About 90% of people in the cities we track have hard or very hard water.
Which city in Wisconsin has the hardest water?
Among 112 cities with pages here, Slinger is highest at 485 mg/L.
Which city in Wisconsin has the softest water?
Wausau, at 32 mg/L.
Other states
- Alabama73
- Alaska110
- Arizona180
- Arkansas39
- California121
- Colorado97
- Connecticut53
- Delaware87
- District of Columbia117
- Florida120
- Georgia28
- Hawaii55
- Idaho118
- Illinois139
- Indiana178
- Iowa183
- Kansas138
- Kentucky134
- Louisiana102
- Maine16
- Maryland105
- Massachusetts38
- Michigan112
- Minnesota160
- Mississippi38
- Missouri121
- Montana116
- Nebraska149
- Nevada232
- New Hampshire20
- New Jersey80
- New Mexico137
- New York31
- North Carolina31
- North Dakota133
- Ohio113
- Oklahoma152
- Oregon24
- Pennsylvania127
- Rhode Island42
- South Carolina32
- South Dakota124
- Tennessee89
- Texas112
- Utah231
- Vermont62
- Virginia65
- Washington36
- West Virginia106
- Wyoming191
Hardness data: TapWaterData US Water Hardness, CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.