St. Clair County, IL
The federal environmental record for St. Clair County (population 251,018): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
3
Superfund NPL sites
39
federal cleanup sites
8
PFAS-detecting water systems
20
TRI facilities
196
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Old American Zinc Plant | Fairmont City | on the NPL | 04/07/2016 |
| Sauget Area 1 | Cahokia, Sauget | proposed | - |
| Sauget Area 2 | Sauget | proposed | - |
Drinking water: PFAS testing
Public water systems serving St. Clair with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| DUPO IL1630350 | PFOS: 5.6 ng/L PFBS: 3.7 ng/L PFHxS: 3.1 ng/L | above final limit |
| FREEBURG IL1630600 | PFOS: 7 ng/L | above final limit |
| CASEYVILLE IL1630250 | PFBA: 12.2 ng/L | detected |
| MILLSTADT IL1630850 | PFBS: 23 ng/L PFBA: 19 ng/L PFPeA: 5.1 ng/L | detected |
| O FALLON IL1631100 | PFBA: 13 ng/L | detected |
| CAHOKIA HEIGHTS IL1635000 | PFBA: 14.8 ng/L PFHxA: 3.6 ng/L PFPeA: 3.1 ng/L | detected |
| IL AMERICAN-EAST ST LOUIS IL1635040 | PFBA: 18.1 ng/L PFHxA: 4.4 ng/L PFPeA: 4.2 ng/L | detected |
| AMERICAN WATER OPER AND MAINTENANCE, LLC IL1635237 | PFBA: 11 ng/L PFPeA: 3.3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
20 facilities in St. Clair filed TRI reports for 2024, totalling 730k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| VEOLIA N.A. INC. | SAUGET | Copper And Copper Compounds, Manganese And Manganese Compounds | 394k lb |
| AFTON CHEMICAL CORP | SAUGET | Zinc compounds, Methanol | 223k lb |
| OCCIDENTAL CHEMICAL CORP SAUGET PLANT | SAUGET | Ammonia, Chlorine | 68k lb |
| SOLVAY FLUORIDES LLC | EAST SAINT LOUIS | Hydrogen fluoride, Ammonia | 11k lb |
| FLEXSYS AMERICA LP KRUMMRICH | SAUGET | Methyl isobutyl ketone, p-Nitroaniline | 8k lb |
| BRENNTAG MID-SOUTH INC. | EAST SAINT LOUIS | Peracetic acid, Hydrogen fluoride | 7k lb |
| ALLNEX USA INC. | EAST SAINT LOUIS | Methyl methacrylate, Xylene (mixed isomers) | 7k lb |
| PHILLIPS 66 CO EAST ST LOUIS TERMINAL | CAHOKIA | Xylene (mixed isomers), Toluene | 6k lb |
| ROHO WEST | BELLEVILLE | Zinc compounds | 4k lb |
| KEMPEN PAINT CO | EAST CARONDELET | Xylene (mixed isomers), Styrene | 2k lb |
| KETTLER CASTING CO INC. | BELLEVILLE | Copper | 1k lb |
| US AIR FORCE/SCOTT AIR FORCE BASE | SCOTT AIR FORCE BASE | Xylene (mixed isomers), Naphthalene | 223 lb |
| EAST SIDE JERSEY DAIRY | O FALLON | Peracetic acid, Certain glycol ethers | 172 lb |
| GATEWAY TERMINALS LLC | SAUGET | n-Hexane, Benzene | 101 lb |
| CERRO FLOW PRODUCTS LLC | SAUGET | Copper compounds, Lead | 94 lb |
| SOLUTIA INC P2S5 PLANT | SAUGET | Phosphorus (yellow or white), Mercury | 3 lb |
| BELLEVILLE SHOE MANUFACTURING CO | BELLEVILLE | - | 0 lb |
| HUBBELL-WIEGMANN | FREEBURG | Nickel, Chromium | 0 lb |
| SIEMENS MFG CO INC | FREEBURG | - | 0 lb |
| OLDCASTLE LAWN & GARDEN | SAUGET | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 686 tank facilities in St. Clair: 381 tanks in service and 1,476 closed. 561 fuel releases are on record, of which 196 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps St. Clair as Zone 2, moderate predicted indoor radon (2 to 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for St. Clair, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- ADVANCED ASYMMETRICSMILLSTADT
- ALCOA PROPERTIESEAST ST. LOUIS
- CARR LEAD PRODUCTSEAST ST. LOUIS
- CLAYTON CHEM COEAST SAINT LOUIS
- E. ST. LOUIS-15TH ST. - FORMER LEADE. ST. LOUIS
- EAST ST. LOUIS GATEWAY LEAD SITESEAST ST. LOUIS
- GATEWAY DEMOLITION SITESEAST ST. LOUIS
- ILLINOIS TERMINAL RAILROADFAIRMONT CITY
- ISAIAH WATSONCAHOKIA
- KRUMMRICH W G PLTSAUGET
- LANSON CHEMICAL/PUREX CORPORATIONEAST ST. LOUIS
- LEWIN METALS DIV CERRO DE PASCO CORPSAUGET
- MONSANTO CO W G KRUMMRICHSAUGET
- MORRIS PAINT & VARNISHEAST ST LOUIS
- MURPHY BUILDINGE. ST. LOUIS
- MUSICK PLATING FIRE RESPONSEEAST ST. LOUIS
- OLD AMERICAN ZINC PLANTFAIRMONT CITY
- PLANTS-N-MOREBELLEVILLE
- ROGERS CARTAGECAHOKIA
- SAINT LOUIS AUTO SHREDDING DRUM DISPOSAL SITEMADISON CITY
- SAUGET AREA 1SAUGET
- SAUGET AREA 2SAUGET
- SAUGET AREA I - DEAD CREEK SEGMENT A (SASAUGET
- SAUGET AREA I - DEAD CREEK SEGMENTS C-FCAHOKIA
- SAUGET AREA I - H.H. HALL CONSTRUCTION COMPANYCAHOKIA
- SAUGET AREA I - H.H. HALL EXCAVATION PITCAHOKIA
- SAUGET AREA I - SAUGET MONSANTO ILLINOIS LANDFILLSAUGET
- SAUGET AREA I - SITE GSAUGET
- SAUGET AREA I - WAGGONER TRUCKING COMAPNYSAUGET
- SAUGET WWTPSAUGET
- SAUGET/TOXICSAUGET
- SCA MILAM LANDFILLEAST ST. LOUIS
- SHANFELD IRON METAL COMPANYEAST ST LOUIS
- SWIFT AG CHEM FAIRMONT CITY PLTFAIRMONT CITY
- UP TRAIN DERAILMENTDUPO
- US AIR FORCE SCOTT AFBSCOTT AIR FORCE BASE
- WASTEX #1 RESEARCHEAST ST. LOUIS
- WESTERN FORGE WORKSEAST ST. LOUIS
- YVONNE SAUGET (TRUST)SAUGET