Clean Water Act discharge permit · NPDES MTG580041
WINNETT WWTF, Winnett, MT: NPDES MTG580041 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
WINNETT WWTF, held by TOWN OF WINNETT, holds NPDES permit MTG580041, which discharges to Mcdonald Creek. EPA’s file records it issued May 10, 2018 and expiring December 31, 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 | WINNETT WWTF |
|---|---|
| Permittee as filed | TOWN OF WINNETT |
| NPDES ID | MTG580041 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 10, 2018 |
| Expiration date | December 31, 2022 |
| Address | Winnett, MT 59087 |
| Receiving water | MCDONALD CREEK |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | McDonald Creek-Winnett (HUC 100402040604) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 10Pollutants on file
- 9Under a numeric limit
- 10With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 45 | 31 | June 30, 2026 | 955% over the limit |
| E. coli, MTEC-MF | 4 | 26 | 18 | March 31, 2025 | 365,852% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 40 | 9 | June 30, 2026 | 93% over the limit |
| BOD, 5-day, percent removal | 1 | 15 | 7 | March 31, 2025 | 340% over the limit |
| Flow rate | 4 | 17 | 6 | September 30, 2021 | 2,147,483,650% over the limit |
| pH | 2 | 34 | 4 | May 31, 2026 | |
| Oil & Grease | 2 | 6 | 0 | ||
| Oil and grease visual | 1 | 4 | 0 | ||
| Duration of discharge | 1 | 3 | 0 | ||
| Chlorine, total residual | 0 | 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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 16, 2025 | Effluent Violations - Unauthorized Discharge | ST6 |
| July 16, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| July 16, 2025 | Management Practice Violations - Failure to Maintain Records | ST6 |
| July 16, 2025 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| September 8, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| September 8, 2021 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| September 8, 2021 | Effluent Violations - Narrative 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 MTG580041 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.