Non-Compliance
Clean Water Act
WEST MIFFLIN - THOMPSON RUN STP
Quick Summary
- •Currently out of compliance in at least one environmental program (CAA, CWA, or RCRA).
- •Assessed $0 in total penalties since records began.
- Address
-
1302 LOWER BULL RUN RD
WEST MIFFLIN, PA 15122
View on map ↗ - County
- ALLEGHENY County
- Inspections
- 6 · last Oct 23, 2025
- Total Penalties
- $0
- Registry ID
- 110039816447
Compliance Status (Last 12 Quarters)
Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.
5
Water (CWA)
Qtrs Non-Compliant
Qtrs Non-Compliant
Compliance Violations
Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.
| Program | Type | Violation Date | Return to Compliance | Status |
|---|---|---|---|---|
| cwa | Permit Violations - Discharge Without a Valid Permit | Oct 23, 2025 | Nov 5, 2025 | Resolved |
| cwa | Permit Violations - Discharge Without a Valid Permit | May 29, 2024 | — | Open |
| cwa | Reporting Violations - Failure to Submit DMRs | May 29, 2024 | — | Open |
| cwa | Permit Violations - Discharge Without a Valid Permit | May 9, 2023 | Dec 6, 2023 | Resolved |
| cwa | Permit Violations - Discharge Without a Valid Permit | Aug 24, 2022 | Dec 6, 2023 | Resolved |
| cwa | Permit Violations - Violation Specified in Comment | Sep 9, 2021 | — | Open |
| cwa | Effluent Violations - Numeric effluent violation | Sep 9, 2021 | — | Open |
| cwa | Effluent Violations - Unapproved Bypass | Jun 4, 2019 | Jun 20, 2019 | Resolved |
| cwa | Permit Violations - Violation Specified in Comment | Sep 1, 1993 | Sep 21, 1993 | Resolved |
Discharge Limit Exceedances
Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.
| Pollutant | Violation | Reported | Limit | Exceedance | Period | Status |
|---|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | DMR, Limited - Numeric Violation | 4.29 mg/L | 4.00 | +7% | Jun 2021 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 77.00 mg/L | 60.00 | +28% | May 2021 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 956.87 kg/d | 681.91 | +40% | May 2021 | Open |
| Nitrogen, ammonia total [as N] | DMR, Limited - Numeric Violation | 5.93 mg/L | 3.00 | +98% | Jul 2020 | Open |
| Nitrogen, ammonia total [as N] | DMR, Limited - Numeric Violation | 6.05 mg/L | 4.00 | +51% | Jul 2020 | Open |
| Nitrogen, ammonia total [as N] | DMR, Limited - Numeric Violation | 4.70 mg/L | 4.00 | +18% | May 2020 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 1,000.00 | +99,999% | Jul 2019 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 36.18 MPN/100mL | 200.00 | +99,999% | May 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 1,000.00 | +99,999% | May 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 10,000.00 | +99,999% | Apr 2018 | Open |
| Nitrogen, ammonia total [as N] | DMR, Limited - Numeric Violation | 5.40 mg/L | 4.50 | +20% | Apr 2018 | Open |
| Nitrogen, ammonia total [as N] | DMR, Limited - Numeric Violation | 4.06 mg/L | 3.00 | +35% | Apr 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 140.06 MPN/100mL | 2,000.00 | +99,999% | Mar 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 10,000.00 | +99,999% | Mar 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 10,000.00 | +99,999% | Feb 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 147.32 MPN/100mL | 2,000.00 | +99,999% | Feb 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 10,000.00 | +99,999% | Oct 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 78.71 MPN/100mL | 2,000.00 | +99,999% | Oct 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 291.34 MPN/100mL | 200.00 | +46% | Aug 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 1,200.00 MPN/100mL | 1,000.00 | +99,999% | Aug 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 1,000.00 | +99,999% | Jun 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 76.00 MPN/100mL | 200.00 | +99,999% | Jun 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 10,000.00 | +99,999% | Apr 2016 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 300.00 MPN/100mL | 10,000.00 | +99,999% | Feb 2016 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 17.84 MPN/100mL | 2,000.00 | +99,999% | Feb 2016 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 620.00 MPN/100mL | 10,000.00 | +99,999% | Dec 2015 | Open |
Enforcement Actions
Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.
State Administrative Order of Consent
Clean Water Act
· Case PA-0026506_12182003 · Dec 18, 2003
State Administrative Order of Consent
Clean Water Act
· Case PA-N00000011 · Sep 21, 1993
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