Groundwater quantity

Groundwater is abundant in Wisconsin and available in sufficient amounts throughout most of the state. Groundwater provides adequate water supplies for most municipal, industrial, agricultural and domestic uses. However, groundwater pumping can lower water levels in an aquifer and in certain settings reduce groundwater discharge to surface water bodies connected to the aquifer. In parts of the state, groundwater availability is limited due to natural aquifer limits or extensive use of supplies.

Water use The Water Use StoryMap showed that the largest category of groundwater withdrawals was municipal public water supplies. The second largest category of groundwater withdrawal in the state was agricultural irrigation. Agricultural irrigation water use varies from year to year depending on the timing of rainfall during the growing season. » Read more.

Water quantity monitoring       In many areas of the state, groundwater and surface water are well connected, requiring a better understanding of the role water withdrawals have on streamflow and lake water levels. The Water Use Monitoring StoryMap explains how we gather the necessary information to understand how groundwater and surface water are connected. » Read more.

Water use research and management tools  Water use research informs Wisconsin’s water quantity management program. Research projects improve our understanding and management of water quantity issues in different parts of Wisconsin. » Read more.

Regional drawdowns Several areas of Wisconsin have seen regional drawdowns of the groundwater due to extensive groundwater withdrawals. These drawdowns can affect water availability and water quality. » Read more.

Groundwater level fluctuations DNR staff track recent and historical precipitation and compare that data to long-term averages to characterize and identify trends. We compare these precipitation patterns to water level readings in monitoring wells around the state. After a period of above-average precipitation amounts from 2017-2020, groundwater levels were at or near all-time highs in 2020 and 2021. Recently, groundwater levels have declined to more typical or average levels. » Read more.