Chicago River (IMAGE) DOE/Argonne National Laboratory Caption Scientists at Argonne and the Metropolitan Water Reclamation District are planning to map the Chicago River microbe population and study how it changes during daily events like storms as well as larger events, such as the MWRD beginning to disinfect its discharge. Credit Metropolitan Water Reclamation District of Greater Chicago Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.