EXXON MOBIL OIL REFINERY
PWS ID: IL3081943 · JOLIET, Illinois 60434
Population Served
1,450
Total Violations
372
Health-Based Violations
3
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Private
- Connections
- 38
- County
- Will
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 364
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Xylenes, Total | MR | 16 | 2025 |
| DICHLOROMETHANE | MR | 16 | 2025 |
| trans-1,2-Dichloroethylene | MR | 16 | 2025 |
| o-Dichlorobenzene | MR | 16 | 2025 |
| p-Dichlorobenzene | MR | 16 | 2025 |
| 1,2-Dichloroethane | MR | 16 | 2025 |
| 1,1,1-Trichloroethane | MR | 16 | 2025 |
| 1,1,2-Trichloroethane | MR | 16 | 2025 |
| Tetrachloroethylene | MR | 16 | 2025 |
| Toluene | MR | 16 | 2025 |
| Ethylbenzene | MR | 16 | 2025 |
| Styrene | MR | 16 | 2025 |
| 1,2,4-Trichlorobenzene | MR | 16 | 2025 |
| 1,1-Dichloroethylene | MR | 16 | 2025 |
| Carbon tetrachloride | MR | 16 | 2025 |
| Trichloroethylene | MR | 16 | 2025 |
| 1,2-Dichloropropane | MR | 16 | 2025 |
| cis-1,2-Dichloroethylene | MR | 16 | 2025 |
| Vinyl chloride | MR | 16 | 2025 |
| CHLOROBENZENE | MR | 16 | 2025 |
| Benzene | MR | 16 | 2025 |
| Revised Total Coliform Rule | MON | 10 | 2025 |
| TTHM | MR | 5 | 2022 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2022 |
| Thallium, Total | MR | 4 | 2020 |
| Revised Total Coliform Rule | RPT | 4 | 2024 |
| Coliform (TCR) | MCL | 3 | 2013 |
| Chlorine | MR | 2 | 2025 |
| Lead and Copper Rule | MR | 2 | 2024 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.