Clean Water Act discharge permit · NPDES MT0020664
SUPERIOR WASTEWATER TREATMENT FACILITY, Superior, MT: NPDES MT0020664 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 16Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
SUPERIOR WASTEWATER TREATMENT FACILITY, held by CITY OF SUPERIOR, holds NPDES permit MT0020664, which discharges to Clark Fork River. EPA’s file records it issued May 9, 2014 and expiring June 30, 2019. 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 | SUPERIOR WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | CITY OF SUPERIOR |
| NPDES ID | MT0020664 |
| 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 | May 9, 2014 |
| Expiration date | June 30, 2019 |
| Address | Superior, MT 59872 |
| Receiving water | CLARK FORK RIVER |
| Subwatershed | Clark Fork River-Thompson Creek (HUC 170102040701) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 19Pollutants on file
- 16Under a numeric limit
- 18With a violation of any kind
- 5With 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 | 22 | 21 | July 31, 2025 | 167% over the limit |
| E. coli, MTEC-MF | 4 | 21 | 16 | July 31, 2025 | 1,821% over the limit |
| Solids, total suspended | 5 | 12 | 10 | August 31, 2025 | 84% over the limit |
| Solids, suspended percent removal | 1 | 3 | 3 | June 30, 2016 | 66% over the limit |
| BOD, 5-day, percent removal | 1 | 1 | 1 | April 30, 2025 | 7% over the limit |
| Temperature, water deg. centigrade | 2 | 6 | 0 | ||
| Phosphorus, total [as P] | 2 | 6 | 0 | ||
| Nitrogen, total [as N] | 2 | 4 | 0 | ||
| Iron, total recoverable | 2 | 3 | 0 | ||
| Lead, total recoverable | 2 | 3 | 0 | ||
| Copper, total recoverable | 2 | 3 | 0 | ||
| pH | 2 | 2 | 0 | ||
| Chlorine, total residual | 0 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 1 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 1 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 1 | 0 | ||
| Oil and grease, hexane extr method | 0 | 1 | 0 | ||
| Flow rate | 2 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 18, 2022 | Management Practice Violations - Failure to Maintain Records | ST6 |
| January 18, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| January 18, 2022 | 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.
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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 MT0020664 there.
Nearby on the register
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.