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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

Report No. 21-44 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on a November 2021 Effluent Sample From Metropolitan Water Reclamation District (MWRD)

Report No. 21-38 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on an October 2021 Effluent Sample from the Terrence J. O'Brien Water Reclamation Plant of the Metropolitan Water Reclamation District (MWRD)

Report No. 21-37 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on an August 2021 Effluent Sample from the Calumet Water Reclamation Plant of the Metropolitan Water Reclamation District (MWRD)

Report No. 21-36 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on a July 2021 Effluent Sample from the Terrence  J. O’Brien Water Reclamation Plant of the Metropolitan Water Reclamation District (MWRD)

Report No. 21-23 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on an May 2021 Effluent Sample From Metropolitan Water Reclamation District (MWRD)

Report No. 21-11 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on an April 2021 Effluent Sample From Metropolitan Water Reclamation District (MWRD)

Report No. 21-10 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on a February 2021 Effluent Sample From Metropolitan Water Reclamation District (MWRD)

Report No. 21-08 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on a January 2021 Effluent Sample From Metropolitan Water Reclamation District (MWRD)

Report No. 18-07 Results of Acute Toxicity Testing with Ceriodaphnia dubia and Pimephales promelas on a February 2018 Effluent Sample From Metropolitan Water Reclamation District (MWRD)