Water Supply Planning Hub
Water is one of the region’s most valuable resources. Communities throughout the Middle Illinois Basin depend on reliable water supplies to support public health, economic development, agriculture, industry, recreation, and healthy ecosystems.
The Water Supply Planning Hub provides a central location for learning about the region’s water resources, where water comes from, how it is used, and the planning efforts helping ensure reliable supplies for future generations.
Understanding our Water Supply
Water used throughout the Middle Illinois Basin comes from both surface water and groundwater sources. Together, these resources support municipal water systems, businesses, farms, industries, and residents across the region.
Surface Water
Surface water includes rivers, lakes, and reservoirs. In the Middle Illinois Basin, rivers serve as important sources of public water supply for many communities.
Communities served by Illinois American Water, like the City of Peoria, receive water supplied through a regional system connected to the Illinois River, while communities such as Pontiac and Streator rely on the Vermilion River as their primary water source.
Groundwater
Groundwater is stored beneath the earth’s surface in underground geologic formations known as aquifers. Aquifers provide important water supplies throughout Illinois and can serve as a reliable source during periods of drought or changing surface water conditions.
One of the region’s most significant groundwater resources is the Sankoty Aquifer, which supplies water to well fields used by Illinois American Water.
Interactive Maps
Connected Municipal Water Systems
Communities throughout the Middle Illinois Basin rely on a combination of surface water, groundwater, and purchased water supplies. Water sources across Illinois include rivers, reservoirs, aquifers, and regional water distribution systems. This interactive map illustrates municipal water sources, public water suppliers, and water purchase relationships between communities throughout the region. The map was developed using data from the Illinois State Water Survey’s Illinois Municipal Water Use program.
Watersheds & Wetlands
Watersheds and wetlands play an important role in protecting water resources, supporting healthy ecosystems, reducing flood risks, and improving water resilience. This interactive map highlights watersheds, wetlands, and priority resource areas identified through the Middle Illinois Basin Water Supply Planning process. The map is intended to support education, planning, and continued stewardship of the region’s water resources.