Clean Water Act discharge permit · NPDES MTG581038
CITY OF TROY WASTEWATER TREATMENT FACILITY, Troy, MT: NPDES MTG581038 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 15Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
CITY OF TROY WASTEWATER TREATMENT FACILITY, held by CITY OF TROY, holds NPDES permit MTG581038, which discharges to Kootenai River. EPA’s file records it issued January 17, 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 | CITY OF TROY WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | CITY OF TROY |
| NPDES ID | MTG581038 |
| 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 | January 17, 2018 |
| Expiration date | December 31, 2022 |
| Address | Troy, MT 59935 |
| Receiving water | KOOTENAI RIVER |
| Subwatershed | Lower Lake Creek (HUC 170101011105) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 15Pollutants on file
- 15Under a numeric limit
- 8With a violation of any kind
- 3With 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 | 6 | 25 | 23 | July 31, 2026 | 147% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 14 | 14 | May 31, 2026 | 61% over the limit |
| Solids, suspended percent removal | 1 | 11 | 9 | August 31, 2025 | 109% over the limit |
| E. coli, MTEC-MF | 4 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 2 | 0 | ||
| Nitrogen, total [as N] | 2 | 1 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 1 | 0 | ||
| Phosphorus, total [as P] | 2 | 1 | 0 | ||
| Flow rate | 2 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Oil & Grease | 1 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| BOD, 5-day, percent removal | 1 | 0 | 0 | ||
| Duration of discharge | 1 | 0 | 0 | ||
| Oil and grease visual | 1 | 0 | 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 |
|---|---|---|
| March 14, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| November 20, 2019 | Management Practice Violations - Failure to Maintain Records | ST6 |
| November 20, 2019 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| November 20, 2019 | Monitoring Violations - Improper Analysis or Lab Error | 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 MTG581038 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.