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Overflow Action Alert

The MWRD has issued an Overflow Action Day alert. Please limit water usage to absolute necessities. Visit our Overflow Action page for more information.

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Metropolitan Water Reclamation District of Greater Chicago

The MWRD's GIS and map data includes a wide range of maps and data sets. 

Featured maps and applications include:

Chicago Area Waterways Water Quality Data

Water quality data including fish populations, dissolved oxygen and water chemistry.

MWRD Leasing Property

An interactive map of MWRD real estate, including property for lease.

Industrial Waste Division

Data on industry and the MWRD Industrial Waste Division.

Stormwater Inundation Mapping Application (SWIMA)

MWRD Stormwater Inundatation Data.

Combined Sewer Overflows (CSO)

A public notification program for combined sewer overflows (CSOs) in Chicago area waterways.

MWRD SEPA Stations

A virtual tour of the MWRD's Sidestream Elevated Pool Aeration stations.

Restore the Canopy, Plant a Tree!

Information about the MWRD program to give away free native tree saplings.

A Fish Story

How the rebirth of the Chicago Area Waterway System spawned a new home for a rebounding population of fish