Illinois / Sewer operators /

Illinois American Water Company

Sewer operator · Illinois · Andalusia, Dunlap, Freeport, Galena, Lemont, Lockport, Mokena, Morris, Saint Charles, Tolono, Washington

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)

IL0021202, IL0024732, IL0031453, IL0031976, IL0031984, IL0032760, IL0032778, IL0036030, IL0045411, IL0045993, IL0047384, IL0047406, IL0055981, IL0059391, IL0061085, IL0065072, IL0021016, IL0022527, IL0023655, IL0029025, IL0036421, IL0053392, IL0059005, ILG580115, ILG582025, ILG551104

Wastewater outlets

20 treatment plant outfalls listed by EPA or state agencies; 13 places named in its own overflow reports (provisional locations) · List

Waters listed as receiving wastewater

MISSISSIPPI RIVER; UNNAMED TRIBUTARY OF THE FOX RIVER; HACKETT BRANCH; UNNAMED TRIBUTARY TO EAST FORK NETTLE CREEK; LONG RUN CREEK; DES PLAINES RIVER; HICKORY CREEK; UNNAMED TRIB OF PECATONICA R.

Tracked waters

Dry Run, IL, Embarras River, IL, Hackett Branch, IL, Mississippi River, IL, Owl Creek, IL, Salt Creek, IL, Salt Fork, IL, Illinois River, IL, Rocky Fork, IL

Discharge records counted

21 records · latest Sep 29, 2026, 3:20 PM CDT

Total reported volume in these records

1,242,370 gallons across the 20 records that give a volume (1 without one)

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: Illinois American Water Company'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.

20 treatment plant outfalls listed by EPA or state agencies; 13 places named in its own overflow reports (provisional locations).

Reports and advisories

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater. Treatment bypass: wastewater skips one or more treatment steps.

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 (8 from Illinois American Water Company) · 2025 (12 from Illinois American Water Company) · 2024 (1 from Illinois American Water Company)

Other sewer operators on these waters

• Embarras River, IL: City of Lawrenceville, City of Newton, Village of Greenup, Village of Sainte Marie
• Mississippi River, IL: City of Chester, 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), 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)
• Salt Creek, IL: City of Farmer City, City of Lincoln, City of Mason City, Village of Kenney
• Salt Fork, IL: Village of Ogden, Village of St Joseph
• Illinois River, IL: Beardstown Sanitary District, City of East Peoria, City of Havana, City of Henry, City of Lacon, City of Lasalle, City of Marseilles, City of Morris, City of Morris, City of Ottawa, City of Pekin, City of Peoria (Peoria CSOS), City of Peru, City of Peru, City of Spring Valley, Greater Chillicothe Sanitary District, Greater Peoria Sanitary And Sewage District, Hennepin Public Water District, Village of Bath, Village of Creve Coeur, Village of Depue, Village of Hardin, Village of Kampsville, Village of North Utica, Village of Seneca

The last 90 days

Reported discharges over time

Historical charts are not available here. See the reports and sources on this page.