Clean Water Act discharge permit · NPDES WI0021547
POTOSI-TENNYSON SEWAGE COMMISSION WWTF, Potosi, WI: NPDES WI0021547 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
POTOSI-TENNYSON SEWAGE COMMISSION WWTF, held by POTOSI-TENNYSON SEWAGE COMMISSION, holds NPDES permit WI0021547, which discharges to Mississippi R. EPA’s file records it issued March 27, 2013 and expiring March 31, 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-TENNYSON SEWAGE COMMISSION WWTF |
|---|---|
| Permittee as filed | POTOSI-TENNYSON SEWAGE COMMISSION |
| NPDES ID | WI0021547 |
| 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 | March 27, 2013 |
| Expiration date | March 31, 2018 |
| Address | Potosi, WI 53820 |
| Receiving water | MISSISSIPPI R |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Sinnipee Creek-Mississippi River (HUC 070600030708) |
| 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
- 9Pollutants on file
- 7Under a numeric limit
- 9With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 1 | 48 | 15 | October 31, 2025 | 305% over the limit |
| Solids, total suspended | 4 | 88 | 12 | May 31, 2025 | 339% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 81 | 5 | July 31, 2024 | 586% over the limit |
| Oxygen, dissolved [DO] | 1 | 20 | 1 | May 31, 2024 | 3% over the limit |
| Coliform, fecal general | 0 | 50 | 0 | ||
| pH | 2 | 38 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 38 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 26 | 0 | ||
| Chloride [as Cl] | 1 | 2 | 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
- 13Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 15, 2025 | WW SSO - Discharge to Waters | ST6 |
| February 3, 2025 | WW SSO - Discharge to Waters | ST6 |
| February 1, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| July 1, 2024 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| February 6, 2024 | WW SSO - Discharge to Waters | ST6 |
| August 9, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| May 18, 2022 | WW SSO - Discharge to Waters | ST6 |
| October 2, 2019 | WW SSO - Discharge to Waters | ST6 |
| October 1, 2019 | WW SSO - Discharge to Waters | ST6 |
| June 26, 2019 | WW SSO - Discharge to Waters | ST6 |
| October 1, 2018 | WW SSO - Discharge to Waters | ST6 |
| July 24, 2018 | WW SSO - Discharge to Waters | ST6 |
| July 21, 2017 | WW SSO - Discharge to Waters | 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, WI0021547.
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 WI0021547 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.