As the regional population grows, demand for groundwater will increase. Groundwater is a resource extending beyond municipal boundaries and therefore requires coordination among various partners. Municipalities working together to protect the quality and quantity of our water supply decreases risk of contamination, minimizes draw down, and averts stream baseflow reductions.
Regional groundwater planning should incorporate wellhead and source protection efforts. Preventing contamination requires proper management of potential pollutants such as pesticides, herbicides, salt, and petroleum products. Maintaining groundwater quantities necessitates water conservation (reducing overall withdrawals) and stormwater management that promotes infiltration and recharge.
This page describes programs in place to protect groundwater. Click to learn about regulations, statewide coordination, local initiatives, and more.
Regulations
Statewide, there are multiple initiatives for maintaining groundwater quality and quantity. Wisconsin has groundwater quality standards for a variety of substances. Various state agencies are responsible for ensuring that groundwater contaminant concentrations do not exceed these standards and cause violations. Periodically, the state reviews these concentrations and adds newly identified contaminants. PFAS are an example of currently unregulated substances that are being investigated for future additions to the list.
Multiple agencies carry out actions to meet regulations:
Department of Agriculture, Trade and Consumer Protection - nutrient management planning, petroleum product storage tanks, pesticide use and storage, fertilizer storage, atrazine prohibition areas, clean sweep, and agrichemical clean-up program and fund
Wisconsin Department of Health Services - enforcement standards
Wisconsin Department of Natural Resource - waste and materials management, industrial and municipal wastewater, wetlands, environmental cleanup, drinking water and groundwater
Public Service Commission - drinking water utilities
Department of Safety and Professional Services - private sewage systems, Wisconsin Fund
Department of Transportation - salt storage, annual winter maintenance report
Review a summary of state regulations here to see regulatory controls of groundwater pollution and withdrawals.
Statewide Coordination
Information Exchange
To ensure that groundwater standards are being met, Wisconsin must coordinate groundwater research and monitoring. The Groundwater Coordinating Council helps state agencies integrate non-regulatory programs and exchange groundwater information. This includes data management, research, and outreach, among other things.
Regional Management
The state also defines groundwater management areas (GMA) where there is significant draw down and coordinated management is especially needed. There are also groundwater attention areas (GAA) where management problems are emerging and, if current trends continue, are likely to become a GMA. Dane County is a GAA.
Water Supply Planning
Municipalities that supply water to more then 10,000 people are required to have an approved water supply service area plan by 2026. These plans help the region prepare for future water demand.
Groundwater Protection Areas are established around new public wells. These zones protect land expected to contribute to a well within five years (or at a minimum, a 1,200 ft radius around a well). Preventing contamination within these recharge areas reduces the risk to public water supplies. Wisconsin Department of Natural Resources coordinates Wellhead Protection and Source Water Protection programs. They also provide a list of funding sources to help municipalities and individuals offset the cost of water and wastewater projects.
The construction and operation of high capacity wells are also regulated by Wisconsin Department of Natural Resources. Permitting helps the state manage the location and quantity of large groundwater withdrawals.
Nutrient Management
Groundwater is also protected by managing the application of agricultural fertilizers and manure. Appropriate nutrient management on farms is one way to reduce the risk of groundwater contamination. UW Extension has developed nutrient application guidelines for Wisconsin crops (available in print or free as a PDF). The Department of Agriculture, Trade and Consumer Protection (DATCP) also helps farmers meet nutrient management requirements. DATCP tracks the status of nutrient management plans across the state. In 2021, 35% of Dane County's cropland had nutrient management plans. Organizations can apply for grants to help teach farmers how to develop nutrient management plans. There is also a grant that directly supports producer-led watershed protection initiatives. Concentrated Animal Feeding Operations (CAFOs) require discharge permits for wastewater. The Wisconsin Department of Natural Resources issues permits and ensures that CAFOs comply with their nutrient management plans.
Local Initiatives
Recharge
Dane County ordinance requires new development (both residential and nonresidential) to infiltrate 90% of the rainfall what would have infiltrated before development. Designing stormwater management practices to meet this requirement seeks to maintain similar groundwater recharge rates pre- and post-development. These standards help reduce the impact of increased impermeable areas. Individual municipalities may also have specific infiltration and recharge ordinances that serve to decrease stormwater runoff and replenish groundwater. Some municipal standards are more stringent than the county requirements.
Septic Systems
Public Health Madison and Dane County review and issue permits for septic systems. This oversight promotes proper design and maintenance of these systems, reducing the risk of groundwater contamination.
Wells
Public Health is also responsible for ensuring that private wells are located appropriately. Regular maintenance and testing of these wells is also important for confirming private wells remain uncontaminated. Annual testing for well contaminants is recommended. Additional testing is recommended if you observe a change in taste, color, or odor.
Municipal water utilities must annual send consumer confidence reports to their customers. You can generate a report for your water utility here.
Waste Disposal
Household hazardous materials and agricultural chemicals can be disposed through Dane County's Clean Sweep program. Properly disposing these products reduces contamination risks to groundwater.
Leftover and expired medications can be disposed through MedDrop. In addition to reducing the risk of overdose and poisoning, this secure disposal program keeps medication from contaminating surface and groundwater.
Salt Use
Salt used in winter de-icing and in water softening eventually reaches surface and groundwater. Wisconsin Salt Wise works with municipalities, private applicators, and residents to minimize salt use, reducing the amount of chloride reaching groundwater.