Clean Water Act discharge permit · NPDES MT0021750
ABSAROKEE SEWER DISTRICT WWTP, Absarokee, MT: NPDES MT0021750 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 15Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
ABSAROKEE SEWER DISTRICT WWTP, held by STILLWATER COUNTY COMMISSIONERS, holds NPDES permit MT0021750, which discharges to Rosebud Creek. EPA’s file records it issued December 17, 2009 and expiring January 31, 2015. 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 | ABSAROKEE SEWER DISTRICT WWTP |
|---|---|
| Permittee as filed | STILLWATER COUNTY COMMISSIONERS |
| NPDES ID | MT0021750 |
| 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 | December 17, 2009 |
| Expiration date | January 31, 2015 |
| Issuing agency | MONTANA DEQ |
| Address | Absarokee, MT 59001 |
| Receiving water | ROSEBUD CREEK |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Rosebud Creek (HUC 100700050406) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 23Pollutants on file
- 15Under a numeric limit
- 23With 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 |
|---|---|---|---|---|---|
| E. coli, MTEC-MF | 4 | 163 | 109 | August 31, 2021 | 61,819% over the limit |
| BOD, 5-day, percent removal | 1 | 74 | 47 | May 31, 2023 | 471% over the limit |
| Solids, suspended percent removal | 1 | 44 | 17 | May 31, 2023 | 231% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 76 | 16 | January 31, 2022 | 1,859% over the limit |
| BOD, 5-day, 20 deg. C | 5 | 150 | 12 | February 28, 2021 | 257% over the limit |
| pH | 3 | 67 | 2 | April 30, 2025 | |
| Solids, total suspended | 5 | 138 | 1 | June 30, 2018 | 20% over the limit |
| Temperature, water deg. fahrenheit | 2 | 37 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 29 | 0 | ||
| Flow rate | 1 | 28 | 0 | ||
| Phosphorus, total [as P] | 1 | 14 | 0 | ||
| Nitrogen, total [as N] | 0 | 12 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 10 | 0 | ||
| Flow rate | 1 | 10 | 0 | ||
| Oil and grease, hexane extr method | 1 | 7 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 7 | 0 | ||
| Cadmium, total recoverable | 0 | 7 | 0 | ||
| Lead, total recoverable | 0 | 7 | 0 | ||
| Mercury, total recoverable | 0 | 7 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 5 | 0 | ||
| Nitrogen, Kjeldahl, dissolved [as N] | 0 | 3 | 0 | ||
| Copper, total recoverable | 0 | 1 | 0 | ||
| Coliform, fecal general | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 17, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| October 17, 2022 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| October 17, 2022 | Monitoring Violations - Analysis not Conducted | ST6 |
| January 23, 2018 | Management Practice Violations - Failure to Maintain Records | ST6 |
| January 23, 2018 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| January 23, 2018 | 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 MT0021750 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.