Clean Water Act discharge permit · NPDES MT0021440
VAUGHN WWTF, Vaughn, MT: NPDES MT0021440 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 15Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
VAUGHN WWTF, held by VAUGHN CASCADE CNTY SEWER DIST, holds NPDES permit MT0021440, which discharges to Sun River. EPA’s file records it issued September 21, 2007 and expiring October 31, 2012. 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 | VAUGHN WWTF |
|---|---|
| Permittee as filed | VAUGHN CASCADE CNTY SEWER DIST |
| NPDES ID | MT0021440 |
| 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 21, 2007 |
| Expiration date | October 31, 2012 |
| Issuing agency | MONTANA DEQ |
| Address | Vaughn, MT 59487 |
| Receiving water | SUN RIVER |
| Subwatershed | Sun River-Sun River Valley (HUC 100301040903) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 15Under a numeric limit
- 16With a violation of any kind
- 9With 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 | 10 | 263 | 116 | November 30, 2018 | 315% over the limit |
| E. coli, MTEC-MF | 9 | 101 | 72 | October 31, 2018 | 39,305% over the limit |
| Solids, total suspended | 10 | 205 | 57 | June 30, 2017 | 308% over the limit |
| BOD, 5-day, percent removal | 1 | 54 | 25 | January 31, 2018 | 640% over the limit |
| Nitrogen, ammonia total [as N] | 1 | 67 | 23 | January 31, 2019 | 283% over the limit |
| pH | 4 | 57 | 13 | December 31, 2018 | |
| Solids, suspended percent removal | 1 | 36 | 8 | December 31, 2017 | 186% over the limit |
| Phosphorus, total [as P] | 8 | 49 | 2 | June 30, 2016 | 238% over the limit |
| Nitrogen, total [as N] | 6 | 31 | 2 | June 30, 2016 | 65% over the limit |
| Chlorine, total residual | 9 | 48 | 0 | ||
| Flow rate | 2 | 38 | 0 | ||
| Temperature, water deg. centigrade | 1 | 33 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 20 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 20 | 0 | ||
| Flow rate | 0 | 16 | 0 | ||
| Oil and grease, hexane extr method | 1 | 10 | 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 |
|---|---|---|
| December 8, 2025 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| February 21, 2017 | Reporting Violations - Failure to Notify | ST6 |
| February 21, 2017 | Management Practice Violations - Failure to Conduct Inspections | ST6 |
| February 21, 2017 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| February 21, 2017 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| February 21, 2017 | Management Practice Violations - Improper Operation and Maintenance | 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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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.