Clean Water Act discharge permit · NPDES MT0021636
HOBSON SEWAGE TREATMENT PLANT, Hobson, MT: NPDES MT0021636 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
HOBSON SEWAGE TREATMENT PLANT, held by TOWN OF HOBSON, holds NPDES permit MT0021636, which discharges to Unnamed Drainage Of Judith River. EPA’s file records it issued September 28, 2012 and expiring October 31, 2017. 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 | HOBSON SEWAGE TREATMENT PLANT |
|---|---|
| Permittee as filed | TOWN OF HOBSON |
| NPDES ID | MT0021636 |
| 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 | September 28, 2012 |
| Expiration date | October 31, 2017 |
| Issuing agency | MONTANA DEQ |
| Address | Hobson, MT 59452 |
| Receiving water | UNNAMED DRAINAGE OF JUDITH RIVER |
| Subwatershed | Judith River-Hobson (HUC 100401030509) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 18Pollutants on file
- 10Under a numeric limit
- 18With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 5 | 89 | 25 | May 31, 2023 | 458% over the limit |
| E. coli, MTEC-MF | 4 | 44 | 18 | April 30, 2025 | 25,297% over the limit |
| Solids, suspended percent removal | 1 | 23 | 12 | March 31, 2022 | 94% over the limit |
| Solids, total suspended | 5 | 72 | 9 | November 30, 2015 | 241% over the limit |
| Coliform, fecal general | 0 | 11 | 8 | April 30, 2001 | 2,962% over the limit |
| BOD, 5-day, percent removal | 1 | 19 | 7 | November 30, 2021 | 94% over the limit |
| pH | 2 | 30 | 5 | June 30, 2007 | |
| Flow rate | 2 | 22 | 0 | ||
| Oil and grease, hexane extr method | 1 | 12 | 0 | ||
| Duration of discharge | 1 | 10 | 0 | ||
| Oil and grease visual | 1 | 8 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 5 | 0 | ||
| Nitrogen, total [as N] | 0 | 4 | 0 | ||
| Phosphorus, total [as P] | 0 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 3 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 3 | 0 | ||
| Temperature, water deg. centigrade | 0 | 2 | 0 | ||
| Flow rate | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 15, 2025 | Management Practice Violations - Failure to Maintain Records | ST6 |
| October 15, 2025 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| October 15, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| October 15, 2025 | Reporting Violations - Failure to Submit DMRs | ST6 |
| April 14, 2021 | Reporting Violations - Failure to Submit DMRs | ST6 |
| April 14, 2021 | Reporting Violations - Improper/ Incorrect Reporting | 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 MT0021636 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.