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FAQs - Water Quality and Public Health

Water hardness

Water is said to be hard if the minerals calcium and magnesium are in the water. The more these naturally occurring minerals are present, the harder the water is considered. It is "hard" for soap to lather or make suds.

Milwaukee's water is considered moderately hard, and water softeners are not necessary for residential use. Milwaukee water hardness can be reported in different measurements:

  • 8.01 grains per gallon
  • 137 milligrams per liter (mg/L) with a range of 112-142 mg/L

Milwaukee Water Works



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Customer Service Center

Zeidler Municipal Building
841 N. Broadway, Room 406
Milwaukee, WI 53202
Open Monday - Friday 7:30 a.m. - 5:00 p.m.

Mailing address: P.O. Box 3268, Milwaukee, WI 53201-3268


 (414) 286-2830

24-Hour Control Center  

 (414) 286-3710


 (414) 286-8801


 (414) 286-5452

Email (non-emergency)