Clean Water Act discharge permit · NPDES MOR04C077
JEFFERSON COUNTY PHASE II MS4, Hillsboro, MO: NPDES MOR04C077 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 1Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
JEFFERSON COUNTY PHASE II MS4, held by Jefferson County, holds NPDES permit MOR04C077, which discharges to Tributary To Joachim Creek. EPA’s file records it issued November 1, 2021 and expiring September 30, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | JEFFERSON COUNTY PHASE II MS4 |
|---|---|
| Permittee as filed | Jefferson County |
| NPDES ID | MOR04C077 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Small municipal storm sewer systems |
| Issued | November 1, 2021 |
| Expiration date | September 30, 2026 |
| Address | Hillsboro, MO 63050 |
| Receiving water | Tributary to Joachim Creek |
| Subwatershed | Rock Creek (HUC 071401010601) |
| SIC | 9511 – Air, Water, & Solid Waste Management |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 1Pollutants on file
- 1Under a numeric limit
- 0With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Report due [yrmoda] | 1 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MOR04C077.
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 15, 2025 | WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| December 19, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| September 13, 2023 | WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| July 14, 2023 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| May 30, 2023 | WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| May 30, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MOR04C077.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MOR04C077 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.