Clean Water Act discharge permit · NPDES MT0030465
TOWN OF PLAINS WWTP, Plains, MT: NPDES MT0030465 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
TOWN OF PLAINS WWTP, held by TOWN OF PLAINS, holds NPDES permit MT0030465, which discharges to Clark Fork River. EPA’s file records it issued February 10, 2017 and expiring March 31, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | TOWN OF PLAINS WWTP |
|---|---|
| Permittee as filed | TOWN OF PLAINS |
| NPDES ID | MT0030465 |
| 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 | February 10, 2017 |
| Expiration date | March 31, 2022 |
| Address | Plains, MT 59859 |
| Receiving water | CLARK FORK RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Clark Fork River-Plains (HUC 170102130510) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 17Pollutants on file
- 14Under a numeric limit
- 13With 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 | 45 | 45 | January 31, 2023 | 13,537% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 40 | 29 | May 31, 2023 | 218% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 0 | 21 | 21 | February 28, 2025 | 163% over the limit |
| Solids, total suspended | 6 | 30 | 19 | June 30, 2025 | 112% over the limit |
| Solids, suspended percent removal | 1 | 4 | 4 | May 31, 2021 | 34% over the limit |
| BOD, carbonaceous, percent removal | 0 | 3 | 3 | June 30, 2014 | 52% over the limit |
| BOD, 5-day, percent removal | 1 | 1 | 1 | February 28, 2023 | 81% over the limit |
| Nitrite + Nitrate total [as N] | 2 | 13 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 13 | 0 | ||
| Nitrogen, total [as N] | 2 | 12 | 0 | ||
| Phosphorus, total [as P] | 2 | 12 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 12 | 0 | ||
| Flow rate | 0 | 12 | 0 | ||
| Flow rate | 2 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Oil and grease, hexane extr method | 2 | 0 | 0 | ||
| Oil and grease visual | 1 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MT0030465.
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.
Watch this permit
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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 MT0030465 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.