Clean Water Act discharge permit · NPDES MO0123404
CITY OF KOSHKONONG WWTP, Koshkonong, MO: NPDES MO0123404 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 12Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CITY OF KOSHKONONG WWTP, held by City of Koshkonong, holds NPDES permit MO0123404, which discharges to Tributary To Bay Creek. EPA’s file records it issued November 13, 2017 and expiring September 30, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CITY OF KOSHKONONG WWTP |
|---|---|
| Permittee as filed | City of Koshkonong |
| NPDES ID | MO0123404 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 13, 2017 |
| Expiration date | September 30, 2022 |
| Address | Koshkonong, MO 65692 |
| Receiving water | Tributary to Bay Creek |
| Subwatershed | Twomile Creek-Warm Fork Spring River (HUC 110100100204) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 12Pollutants on file
- 12Under a numeric limit
- 11With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 2 | 12 | 12 | March 31, 2025 | 560% over the limit |
| Solids, total suspended | 2 | 5 | 5 | September 30, 2017 | 113% over the limit |
| E. coli | 2 | 4 | 4 | March 31, 2021 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 3 | 3 | June 30, 2023 | 238% over the limit |
| BOD, 5-day, percent removal | 1 | 3 | 3 | March 31, 2025 | 460% over the limit |
| Solids, suspended percent removal | 1 | 3 | 3 | September 30, 2024 | 173% over the limit |
| pH | 2 | 3 | 1 | September 30, 2012 | |
| Flow, in conduit or thru treatment plant | 2 | 2 | 0 | ||
| Chlorine, total residual | 2 | 2 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 1 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 0 | 0 |
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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 29, 2021 | Effluent Violations - Numeric effluent violation | 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, MO0123404.
Start the watch
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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 MO0123404 there.
Nearby on the register
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- Every permit record in Koshkonong, A to Z
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- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.