Non-Compliance
Clean Water Act
MASON CITY 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
-
1.5 MILES SOUTH OF MASON CITY
MASON CITY, IL 62664
View on map ↗ - County
- MASON County
- Total Penalties
- $0
- Registry ID
- 110009988004
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.
10
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 | Schedule Event unachieved and not reported | Feb 28, 2025 | Mar 31, 2025 | Resolved |
| cwa | Schedule Event unachieved and not reported | Feb 28, 2025 | Mar 31, 2025 | Resolved |
| cwa | Schedule Event unachieved and not reported | Aug 31, 2024 | Nov 30, 2024 | Resolved |
| cwa | Schedule Event achieved late but reported | Dec 31, 2020 | — | Open |
| cwa | Schedule Event unachieved but reported | Jul 1, 2020 | Sep 30, 2021 | Resolved |
| cwa | Schedule Event unachieved and not reported | Jul 1, 2020 | Sep 30, 2021 | Resolved |
| cwa | Schedule Event reported late | Jul 1, 2020 | — | Open |
| cwa | Schedule Event achieved late but reported | Jul 1, 2020 | — | Open |
| cwa | Schedule Event achieved late but reported | Dec 31, 2018 | — | Open |
| cwa | WW CSO - Violation of a milestone in a permit | May 6, 2014 | — | Open |
| cwa | Schedule Event reported late | Jan 31, 2014 | — | Open |
| cwa | Schedule Event achieved late but reported | Jan 31, 2014 | — | Open |
| cwa | Schedule Event unachieved and not reported | Jan 31, 2014 | May 19, 2014 | Resolved |
| cwa | Schedule Event unachieved but reported | Jan 31, 2014 | May 19, 2014 | Resolved |
| cwa | Schedule Event unachieved and not reported | Jan 31, 2013 | Mar 21, 2013 | Resolved |
| cwa | Schedule Event reported late | Jan 31, 2013 | — | Open |
| cwa | Schedule Event achieved late but reported | Jan 31, 2013 | — | Open |
| cwa | Schedule Event unachieved but reported | Jan 31, 2013 | Mar 21, 2013 | Resolved |
| cwa | Schedule Event unachieved and not reported | Oct 31, 2012 | May 7, 2014 | Resolved |
| cwa | Schedule Event reported late | Oct 31, 2012 | — | Open |
| cwa | Schedule Event achieved late but reported | Oct 31, 2012 | — | Open |
| cwa | Schedule Event unachieved but reported | Oct 31, 2012 | May 7, 2014 | Resolved |
| cwa | Schedule Event unachieved and not reported | Jan 31, 2012 | Mar 21, 2013 | Resolved |
| cwa | Schedule Event reported late | Jan 31, 2012 | — | Open |
| cwa | Schedule Event unachieved but reported | Jan 31, 2012 | Mar 21, 2013 | Resolved |
| cwa | Schedule Event achieved late but reported | Jan 31, 2012 | — | Open |
| cwa | Schedule Event achieved late but reported | Jan 31, 2010 | — | Open |
| cwa | Management Practice Violations - Failure to Develop/Enforce Standards | Aug 27, 2009 | — | Open |
| cwa | WW CSO - Failure to Implement LTCP | Aug 27, 2009 | — | Open |
| cwa | Schedule Event unachieved and not reported | Dec 1, 2008 | Mar 15, 2011 | Resolved |
| cwa | Schedule Event reported late | Dec 1, 2008 | — | Open |
| cwa | Schedule Event achieved late but reported | Dec 1, 2008 | — | Open |
| cwa | Schedule Event unachieved but reported | Dec 1, 2008 | Mar 15, 2011 | Resolved |
| cwa | Management Practice Violations - Improper Operation and Maintenance | Aug 16, 2007 | — | Open |
| cwa | Schedule Event unachieved and not reported | Dec 1, 2005 | Jun 1, 2007 | Resolved |
| cwa | Schedule Event achieved late but reported | Dec 1, 2005 | — | Open |
| cwa | Schedule Event achieved late but reported | Jun 1, 2005 | — | Open |
| cwa | Schedule Event achieved late but reported | Jan 31, 1999 | — | Open |
| cwa | Schedule Event unachieved and not reported | Jan 31, 1998 | Sep 30, 1998 | 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 |
|---|---|---|---|---|---|---|
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 34.70 mg/L | 25.00 | +39% | Aug 2023 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 34.50 mg/L | 25.00 | +38% | May 2023 | Open |
| Oxygen, dissolved [DO] | DMR, Limited - Numeric Violation | 5.85 mg/L | 6.00 | +3% | May 2023 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 32.20 mg/L | 25.00 | +29% | Mar 2022 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Sep 2021 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Jul 2021 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | May 2021 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 1,947.00 MPN/100mL | 400.00 | +387% | Nov 2020 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 68.60 mg/L | 40.00 | +72% | Aug 2020 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 68.60 mg/L | 25.00 | +174% | Aug 2020 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Jul 2020 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Jun 2020 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 861.00 MPN/100mL | 400.00 | +115% | May 2020 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 1,040.00 MPN/100mL | 400.00 | +160% | Apr 2020 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 593.30 MPN/100mL | 400.00 | +48% | Mar 2020 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Sep 2019 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 28.60 mg/L | 25.00 | +14% | Aug 2019 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Aug 2019 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Jul 2019 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 30.80 mg/L | 25.00 | +23% | May 2019 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 38.70 mg/L | 37.00 | +5% | May 2019 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 808.00 MPN/100mL | 400.00 | +102% | Apr 2019 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 29.90 mg/L | 25.00 | +20% | Apr 2019 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Dec 2018 | Open |
| Oxygen, dissolved [DO] | DMR, Limited - Numeric Violation | 5.00 mg/L | 5.50 | +9% | Oct 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Sep 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Jul 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Jun 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | May 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | 1,790.00 MPN/100mL | 400.00 | +348% | Apr 2018 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 74.00 mg/L | 40.00 | +85% | Jan 2018 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 44.80 mg/L | 25.00 | +79% | Jan 2018 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Oct 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Sep 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | Jul 2017 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 39.00 mg/L | 37.00 | +5% | May 2017 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 38.50 mg/L | 25.00 | +54% | May 2017 | Open |
| Coliform, fecal general | DMR, Limited - Numeric Violation | — MPN/100mL | 400.00 | +99,999% | May 2017 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 25.50 mg/L | 25.00 | +2% | Feb 2017 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 34.30 mg/L | 25.00 | +37% | Jan 2017 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 70.00 mg/L | 40.00 | +75% | Jan 2017 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 257.42 kg/d | 201.12 | +28% | Apr 2016 | Open |
| Oxygen, dissolved [DO] | DMR, Limited - Numeric Violation | 4.70 mg/L | 5.00 | +6% | Mar 2016 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 33.00 mg/L | 25.00 | +32% | Sep 2015 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 119.00 mg/L | 40.00 | +198% | Sep 2015 | Open |
| Oxygen, dissolved [DO] | DMR, Limited - Numeric Violation | 3.80 mg/L | 4.00 | +5% | Aug 2015 | Open |
| Oxygen, dissolved [DO] | DMR, Limited - Numeric Violation | 4.50 mg/L | 5.00 | +10% | Jun 2015 | Open |
| BOD, carbonaceous [5 day, 20 C] | DMR, Limited - Numeric Violation | 38.70 mg/L | 25.00 | +55% | May 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 IL-N00008316 · Aug 23, 2007
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