Clean Water Act discharge permit · NPDES MO0107328
PORTAGE DES SIOUX WWTP, Portage Des Sioux, MO: NPDES MO0107328 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
PORTAGE DES SIOUX WWTP, held by Portage Des Sioux, holds NPDES permit MO0107328, which discharges to Mississippi R.. EPA’s file records it issued January 10, 2020 and expiring September 30, 2024. 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 | PORTAGE DES SIOUX WWTP |
|---|---|
| Permittee as filed | Portage Des Sioux |
| NPDES ID | MO0107328 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | January 10, 2020 |
| Expiration date | September 30, 2024 |
| Address | Portage Des Sioux, MO 63373 |
| Receiving water | Mississippi R. |
| Subwatershed | Marais Temps Clair-Mississippi River (HUC 071100090401) |
| SIC | 4952 – Sewerage Systems |
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
- 14Pollutants on file
- 10Under a numeric limit
- 14With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 0 | 47 | 39 | June 30, 2016 | 251,150% over the limit |
| Nitrogen, ammonia total [as N] | 8 | 57 | 19 | December 31, 2020 | 900% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 73 | 12 | December 31, 2020 | 313% over the limit |
| Ammonia [as N] + unionized ammonia | 0 | 8 | 8 | June 30, 2016 | 212% over the limit |
| Solids, total suspended | 6 | 65 | 7 | December 31, 2020 | 100% over the limit |
| pH | 4 | 53 | 7 | February 28, 2021 | |
| BOD, 5-day, percent removal | 2 | 16 | 7 | December 31, 2022 | 111% over the limit |
| Solids, suspended percent removal | 2 | 17 | 5 | February 28, 2021 | 567% over the limit |
| E. coli | 4 | 17 | 1 | August 31, 2021 | 59% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 46 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 28 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 14 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 0 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 0 | 1 | 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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 30, 2023 | Reporting Violations - Failure to Submit DMRs | ST6 |
| March 31, 2022 | Reporting Violations - Failure to Submit DMRs | ST6 |
| January 10, 2022 | Reporting Violations - Failure to Submit DMRs | ST6 |
| March 25, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| March 25, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| February 28, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| February 28, 2020 | Effluent Violations - Numeric effluent violation | ST6 |
| December 31, 2019 | Effluent Violations - Numeric effluent violation | ST6 |
| March 21, 2017 | 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, MO0107328.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MO0107328 there.
Nearby on the register
- Discharge permits in Portage Des Sioux
- Every permit record in Portage Des Sioux, A to Z
- Discharge permits in Missouri
- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.