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Metropolitan Water Reclamation District of Greater Chicago

Please send monitoring data requests or questions to waterqualitydata@mwrd.org.

Ambient Water Quality Monitoring (AWQM)

AWQM Station Map
AWQM Quality Assurance Project Plan

Continuous Dissolved Oxygen Monitoring (CDOM)

CDOM Station Map
CDOM Station List
CDOM Quality Assurance Project Plan

Report No. 23-34 Continuous Dissolved Oxygen Monitoring in the Service Area of the Metropolitan Water Reclamation District of Greater Chicago During 2022

Biological Monitoring

Fish Species Collected in the Chicago Area Waterway System

Water Quality Data

2022 Waterway Ambient Water Quality
2021 Waterway Ambient Water Quality
2020 Waterway Ambient Water Quality
2019 Waterway Ambient Water Quality
2018 Waterway Ambient Water Quality

Argonne Microbiome Research

Chicago Area Waterway System Argonne Microbiome Research - Phase III Final Report - July, 2020
Chicago Area Waterway System Argonne Microbiome Research Phase III Final Report  Addendum September, 2020

Water Quality Reports

Report 19-13 Post-Construction Monitoring Report for the Calumet Tunnel and Reservoir Plan System

Report 18-01 Guidelines for “Optimal” Withdrawal of Discretionary Diversion to and Operation of the Aeration Stations on the Chicago Area Waterway System

Sensitive Area Considerations

Report 18-09 Sensitive Area Considerations for Outfalls Designated in National Pollutant Discharge Elimination System Permit Number IL0028088 for the Terrence J. O’Brien Water Reclamation Plant

Illinois Waterway Monitoring

Illinois Waterways Map
Illinois Waterways Station Table
Illinois Waterway Monitoring Project Quality Assurance Project Plan