Illinois sewage discharges in 2023
2 records of sewage discharges and water advisories in Illinois dated in 2023, newest first. Each record keeps the source's own times and wording; a record from the last three months, or one that sets a status now, also has a page of its own.
By type: Combined sewer overflow (CSO)2
By source: Metropolitan Water Reclamation District of Greater Chicago (Reversals to Lake Michigan table)2
2023 in other states: California, Connecticut, District of Columbia, Florida, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New York, North Carolina, Pennsylvania, Rhode Island, Vermont, Washington.
Source: the agencies, sewer operators and EPA records named on each row and on the Sources page. Updated 2026-11-06 09:03 UTC.
Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system.
| When | Report | Status |
|---|---|---|
| to Jul 3 ’23 | Metro Water Reclamation District Of Greater Chicago · Lake Michigan · Wilmette Gate Wilmette gate (North Shore Channel) · CSO · 230.8 million gallons · notice · map | ended |
| to Jul 3 ’23 | Metro Water Reclamation District Of Greater Chicago · Lake Michigan · Chicago River Controlling Works Chicago River Controlling Works · CSO · 911.8 million gallons · notice · map | ended |
Sources: MWRD Lake Michigan reversals table (1985 to present), retrieved 2026-11-06 08:41 UTC. A report's record id and times show when you hover or focus its "report" link.