Clean Water Act discharge permit · NPDES MT0031798
TOWN OF CULBERTSON DOMESTIC WWTF, Culbertson, MT: NPDES MT0031798 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 16Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
TOWN OF CULBERTSON DOMESTIC WWTF, held by TOWN OF CULBERTSON, holds NPDES permit MT0031798, which discharges to Missouri River. EPA’s file records it issued April 24, 2014 and expiring May 31, 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 | TOWN OF CULBERTSON DOMESTIC WWTF |
|---|---|
| Permittee as filed | TOWN OF CULBERTSON |
| NPDES ID | MT0031798 |
| 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 | April 24, 2014 |
| Expiration date | May 31, 2019 |
| Address | Culbertson, MT 59218 |
| Receiving water | MISSOURI RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Missouri River-Day Creek (HUC 100600050901) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 16Under a numeric limit
- 16With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 6 | 62 | 34 | June 30, 2026 | 667% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 47 | 23 | April 30, 2026 | 233% over the limit |
| Solids, suspended percent removal | 1 | 27 | 23 | June 30, 2026 | 255% over the limit |
| pH | 2 | 31 | 21 | May 31, 2026 | |
| BOD, 5-day, percent removal | 1 | 9 | 5 | April 30, 2021 | 220% over the limit |
| Flow rate | 2 | 6 | 0 | ||
| Phosphorus, total [as P] | 1 | 5 | 0 | ||
| E. coli, MTEC-MF | 1 | 4 | 0 | ||
| Oil and grease, hexane extr method | 1 | 2 | 0 | ||
| Nitrogen, total [as N] | 1 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 2 | 0 | ||
| Arsenic, total recoverable | 1 | 2 | 0 | ||
| Iron, total recoverable | 1 | 2 | 0 | ||
| Cadmium, total recoverable | 1 | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| November 17, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| January 23, 2018 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| January 23, 2018 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| January 23, 2018 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| January 23, 2018 | Management Practice Violations - Failure to Maintain Records | 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 MT0031798 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.