Clean Water Act discharge permit · NPDES MO0099431
POTOSI WWTP NO. 1, Potosi, MO: NPDES MO0099431 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
POTOSI WWTP NO. 1, held by City of Potosi, holds NPDES permit MO0099431, which discharges to Brushy Hollow Br.. EPA’s file records it issued January 6, 2014 and expiring June 30, 2018. 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 | POTOSI WWTP NO. 1 |
|---|---|
| Permittee as filed | City of Potosi |
| NPDES ID | MO0099431 |
| 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 | January 6, 2014 |
| Expiration date | June 30, 2018 |
| Address | Potosi, MO 63664 |
| Receiving water | Brushy Hollow Br. |
| Subwatershed | Mine a Breton Creek (HUC 071401040201) |
| 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
- 12Pollutants on file
- 7Under a numeric limit
- 12With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 0 | 17 | 17 | August 31, 2013 | 4,500% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 20 | 16 | March 31, 2023 | 678% over the limit |
| E. coli, colony forming units [CFU] | 2 | 10 | 8 | October 31, 2017 | 288% over the limit |
| Solids, suspended percent removal | 0 | 3 | 3 | May 31, 2023 | 566% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 16 | 2 | May 31, 2019 | 83% over the limit |
| BOD, 5-day, percent removal | 0 | 2 | 2 | June 30, 2019 | 566% over the limit |
| Solids, total suspended | 3 | 14 | 0 | ||
| pH | 2 | 12 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 10 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 8 | 0 | ||
| Nitrogen, total [as N] | 0 | 8 | 0 | ||
| Phosphorus, total [as P] | 0 | 8 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 23, 2023 | Effluent Violations - Numeric effluent violation | ST6 |
| May 23, 2023 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 30, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| March 21, 2017 | 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
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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 MO0099431 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.