Water Quality 

Please note: Annual water quality reports from the previous year, including the Consumer Confidence Report, will be posted by April 1 each year.

The Milwaukee Water Works (MWW) is recognized as a national leader for providing safe, high-quality drinking water, and for our water quality monitoring program.

In 2020, the Wisconsin Section of the American Water Works Association presented the Milwaukee Water Works with its Utility Achievement Award for Ongoing Excellence for obtaining DNR accreditation of its Water Quality Laboratory. The lab is certified for 30 water quality parameters, including Lead and Copper, using USEPA and Standard Methods. The MWW Water Quality Laboratory aims to continue to be a leader in research and collaboration.

Treatment
MWW purifies Lake Michigan water with ozone disinfection, biologically active filtration, and chloramine disinfection. Following the 1993 Cryptosporidum outbreak, Milwaukee Water Works invested $508 million in its infrastructure and water quality monitoring to ensure a reliable supply of pure, safe drinking water.

Water quality is regulated by the U.S. Environmental Protection Agency (EPA), the Wisconsin Department of Natural Resources (DNR), and the Wisconsin Department of Health Services (DHS). Milwaukee regularly monitors and tests our drinking water beyond what is required. 

Lead
Among many regulations followed by the Milwaukee Water Works, the Lead and Copper Rule (LCR) is a federal regulation that limits the concentration of lead and copper allowed in public drinking water. It also limits the permissible amount of pipe corrosion. Utilities must ensure that tap water samples do not exceed the action level of 15 micrograms per liter (ug/L) for lead and 1300 micrograms per liter for copper in at least 90 percent of the consumer taps sampled. Milwaukee Water Works is required to sample water at 50 residential properties every three years.

Monitoring in 2023 found Milwaukee’s water well within compliance standards. This chart shows results of test results for lead from the beginning of the LCR in 1993 through 2023. The sampling results have been below the action level since 1999 because of the effectiveness of our corrosion control program which was implemented in 1998.

PFAS
Milwaukee Water Works has been testing our drinking water for several PFAS compounds since 2008, in an effort to closely monitor our water quality. In recent years, we have been testing for 45 different PFAS compounds every year. In addition to our own annual voluntary sampling, we also agreed to participate in the Wisconsin Department of Natural Resources (WDNR) one-time voluntary testing in summer 2022. Our results from this voluntary testing and more information about PFAS can be found here. 
 

Find the most recent test results for all substances in our 2022 Consumer Confidence Report and in related data sets on Lake Michigan source water, treated water from the Howard and Linwood plants and the water in our distribution system (a.k.a. "entry points").