City of Chester
Sewer operator · Illinois · Chester
Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.
Ringed dots mark treatment plant outfalls. Small hollow diamonds mark places named in its overflow reports (provisional). Square boat markers mark boat launches listed by OpenBoatLaunch.
- Federal wastewater discharge permit (NPDES)
- IL0072931
- Wastewater outlets
- 1 treatment plant outfall listed by EPA or state agencies; 5 places named in its own overflow reports (provisional locations) · List
- Waters listed as receiving wastewater
- MISSISSIPPI RIVER
- Tracked waters
- Mississippi River, IL, Marys River, IL
- Discharge records counted
- 9 records · latest
- Total reported volume in these records
- 29,050 gallons across the 9 records that give a volume
These totals reflect the records we track. Missing volumes and gaps in reporting limit comparisons between operators.
Sources: EPA ECHO and the operator and state sources linked below. Counts use the discharge records on this page. Updated 2026-11-06 09:03 UTC.
Public notices and alerts
We do not list an alert service for this operator yet. Check its website.
Source: City of Chester's public notice and alert pages and the state's notification records.
Report a missing notice or error
Wastewater outlets
Outfall: a pipe or outlet where wastewater enters a water body.
1 treatment plant outfall listed by EPA or state agencies; 5 places named in its own overflow reports (provisional locations).
Treatment plant outfalls
1 outfall
- Outfall 001 · receiving water in the permit: MISSISSIPPI RIVER · Mississippi River, IL · status not published
Source: U.S. Environmental Protection Agency (EPA) permit records (ICIS-NPDES permitted features): where a treatment plant’s permitted discharge leaves. No national source says whether a plant outfall is open or closed.
Places named in overflow reports (provisional)
5 places
Provisional location from overflow reports. Where the operator's own reports put an overflow: a manhole, pump station or plant. Not an outfall listed in a permit.
- Reported place · 4 overflow reports, latest Oct 31, 2025 · confidence high · no water record yet
- Reported place · 2 overflow reports, latest Aug 18, 2025 · confidence high · no water record yet
- Reported place · 1 overflow report, latest Jan 6, 2026 · confidence medium · no water record yet
- Reported place · 1 overflow report, latest Sep 2, 2025 · confidence medium · no water record yet
- Reported place · 1 overflow report, latest Apr 6, 2025 · confidence medium · no water record yet
Source: the operator's own overflow reports to the state. DirtyWaterWatch groups reports within 50 metres into one place and finds the water below it with U.S. Geological Survey river maps (NLDI, NHDPlus). Not a permitted outfall; provisional until an official outfall record exists.
Reports and advisories
Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.
| When | Report | Status |
|---|---|---|
| to Jan 7, 2:45 AM CST | “mississippi river” · SSO · 400 gallons report · notice · map | ended |
| to Nov 1 ’25, 4:00 AM CDT | Mississippi River · SSO · 200 gallons report · notice · map | ended |
| to 10:30 PM CDT | Mississippi River · SSO · 50 gallons report · notice · map | ended |
| to 8:30 PM CDT | Mississippi River · SSO · 80 gallons report · notice · map | ended |
| to 9:30 PM CDT | Marys River · SSO · 20 gallons report · notice · map | ended |
| to 9:00 PM CDT | “marts river” · SSO · 5,000 gallons report · notice · map | ended |
| to Jul 30 ’25, 9:00 PM CDT | Marys River · SSO · 20,000 gallons report · notice · map | ended |
| to 3:00 PM CDT | Marys River · SSO · 3,000 gallons report · notice · map | ended |
| to 12:30 PM CDT | Mississippi River · SSO · 300 gallons report · notice · map | ended |
Sources: EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators), retrieved 2026-11-06 08:38 UTC. A report's record id and times show when you hover or focus its "report" link.
All reports in Illinois by year: 2026 (1 from City of Chester) · 2025 (8 from City of Chester)
Other sewer operators on these waters
- Mississippi River, IL: City of Columbia, City of Dallas City, City of East Dubuque, City of East Moline, City of East St Louis Combined Sewer, City of Edwardsville, City of Fulton, City of Hamilton, City of Nauvoo, City of New Boston, City of Quincy, City of Rock Island, City of Savanna, City of Wood River, Illinois American Water (Alton STP), Illinois American Water Company, Metro East Facility Sanitary District, Village of Cordova, Village of Dupo, Village of Hartford CSO Outfall, Village of Port Byron, Village of Sauget (Sauget-Abrtf), Village of Thomson, City of Moline, Illinois American Water Company (Granite City WWTP)
The last 90 days
No discharge, advisory or caution periods are shown for the waters this sewer operator's reports were placed on in this time span. Check downstream stretches and source coverage.
Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-06 09:03 UTC.
Reported discharges over time
Historical charts are not available here. See the reports and sources on this page.