Residents
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Drinking water and lead
Lead is a common metal. Although originally used in many consumer products, lead is now known to be harmful to human health if ingested or inhaled. It can be found in lead-based paint, air, soil, household dust, food, some types of pottery and…
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Municipal water system disinfection
The vast majority of Wisconsin’s municipal water systems currently disinfect the water they deliver to consumers, killing viruses and bacteria that can unexpectedly occur. Learn if your municipal water system disinfects its water Here's how you…
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Contaminants
This information can help you learn more about contaminants in drinking water, make decisions about water testing, assess your personal health situation and understand options for water supply or treatment if needed.
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Drinking water administrative codes
Wisconsin Administrative Codes that relate to private and public drinking water are provided on this page as links to the Wisconsin Legislative website. To request an official paper copy of a specific code, follow the instructions on the Wisconsin…
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Drinking Water and Groundwater Study Group
The Drinking Water and Groundwater Study Group is a stakeholder working group formed in 2017 by DNR's Drinking Water and Groundwater (DG) program. The group serves as a forum for the program to receive input from and provide information to…
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What’s wrong with my water?
You wonder if something's wrong with the water coming from your private well. It smells, tastes or looks different; or it stains your laundry or bathroom fixtures. Confirm the cause of your water complaints before attempting to fix them.Get the…
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Look Up Drinking Water Data
The Federal Safe Drinking Water Act (SDWA) standards apply to all water systems providing water for human consumption to the general public. This may include residences without a private well, as well as places of business that have their own well(s…
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The quality of Wisconsin's drinking water
Safe, clean drinking water is what we expect when we turn on our faucets. The Wisconsin DNR works to protect the quality and quantity of the state’s water resources and ensure the safety of drinking water. We're here to help you be better informed…
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Identify your water’s symptoms
Diagnose your water concerns based on the symptoms you notice about your drinking water. Possible causes are listed with the most likely first. Get answers to these and more questions:
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Drinking water & groundwater quality standards/advisory levels
The Drinking Water & Groundwater Quality Standards/Advisory Levels [PDF] contains the tables: