Clean Water Act discharge permit · NPDES MT0028797
TWIN BRIDGES WWTF, Twin Bridges, MT: NPDES MT0028797 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 16Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
TWIN BRIDGES WWTF, held by TOWN OF TWIN BRIDGES, holds NPDES permit MT0028797, which discharges to Bayers Irr Ditch Via Jefferson Riv. EPA’s file records it issued January 20, 2015 and expiring February 29, 2020. 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 | TWIN BRIDGES WWTF |
|---|---|
| Permittee as filed | TOWN OF TWIN BRIDGES |
| NPDES ID | MT0028797 |
| 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 20, 2015 |
| Expiration date | February 29, 2020 |
| Address | Twin Bridges, MT 59754 |
| Receiving water | BAYERS IRR DITCH VIA JEFFERSON RIV |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 18Pollutants on file
- 16Under a numeric limit
- 18With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 5 | 46 | 9 | March 31, 2012 | 418% over the limit |
| BOD, 5-day, percent removal | 1 | 12 | 8 | April 30, 2012 | 113% over the limit |
| BOD, 5-day, 20 deg. C | 5 | 45 | 4 | February 28, 2011 | 36% over the limit |
| Solids, suspended percent removal | 1 | 7 | 3 | March 31, 2012 | 186% over the limit |
| Flow rate | 2 | 27 | 0 | ||
| Nitrogen, total [as N] | 2 | 11 | 0 | ||
| Phosphorus, total [as P] | 2 | 10 | 0 | ||
| pH | 3 | 9 | 0 | ||
| Temperature, water deg. centigrade | 3 | 7 | 0 | ||
| E. coli, MTEC-MF | 4 | 6 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 5 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 5 | 0 | ||
| Oil and grease, hexane extr method | 1 | 2 | 0 | ||
| Iron, total recoverable | 1 | 1 | 0 | ||
| Lead, total recoverable | 1 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 1 | 0 | ||
| Solids, total dissolved [TDS] | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 18, 2025 | Management Practice Violations - Failure to Conduct Inspections | 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.
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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 MT0028797 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.