Drinking Water
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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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Laboratory testing
The Safe Drinking Water Act (SDWA) requires public water systems to test water supplies for bacteriological agents and chemical contaminants to protect the health of their consumers. The frequency and extent of testing is dependent on the population…
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Using the DNR’s web form for entering public drinking water results
Each laboratory needs to get a user id for each person that will be doing data entry on the DNR web form. This is an important security step, and allows us to make sure that each user is authorized to enter data on behalf of the laboratory. The user…
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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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Risk & Resilience Assessments and Emergency Response Plans (AWIA Section 2013)
Section 2013 of AWIA requires community water systems that serve a population of 3,300 or more to conduct a risk and resilience assessment and develop an emergency response plan that must be updated and certified every five years.These requirements…
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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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Source water protection
Source water protection helps prevent contaminants from entering sources of drinking water. It's the first line of defense to reduce the chance that contaminants will be in a glass of water from your tap. Source water protection avoids potential…
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Wisconsin’s Source Water Assessment Program
As a result of the 1996 Amendments to the Safe Drinking Water Act, all states were required to complete source water assessments for all public water systems. DNR produced these assessments during the period between 1999 and 2003. These original…