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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Waterways Jan 2001 - July 2003 Ambient Water Quality

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Waterways Aug 2003 - Dec 2004 Ambient Water Quality

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1991-2000 Waterway Ambient Water Quality

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1981-1990 Waterway Ambient Water Quality

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Report 09-50 Continuous Dissolved Oxygen Monitoring in the Deep-Draft Chicago Waterway System During 2008

MONITORING AND RESEARCHMONITORING AND RESEARCHMONITORING AND RESEARCHMONITORING AND RESEARCH DEPARTM…