Clean Water Act discharge permit · NPDES MT0023388
FLATHEAD LAKE BIOLOGICAL STATION WWTF, Polson, MT: NPDES MT0023388 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
FLATHEAD LAKE BIOLOGICAL STATION WWTF, held by Flathead Lake Biological Station, holds NPDES permit MT0023388, which discharges to Flathead Lake. EPA’s file records it issued May 31, 2012 and expiring June 30, 2017. 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 | FLATHEAD LAKE BIOLOGICAL STATION WWTF |
|---|---|
| Permittee as filed | Flathead Lake Biological Station |
| NPDES ID | MT0023388 |
| 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 31, 2012 |
| Expiration date | June 30, 2017 |
| Issuing agency | U.S. EPA Region 8 |
| Address | Polson, MT 59860 |
| Receiving water | FLATHEAD LAKE |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Flathead Lake (HUC 170102080501) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 13Under a numeric limit
- 16With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Nitrogen, total [as N] | 1 | 90 | 5 | December 31, 2024 | 509% over the limit |
| Chlorine, total residual | 1 | 41 | 5 | April 30, 2025 | 426% over the limit |
| Phosphorus, total [as P] | 1 | 103 | 4 | December 31, 2025 | 425% over the limit |
| Floating solids, waste or visible foam-visual | 1 | 40 | 1 | June 30, 2007 | |
| Solids, total suspended | 2 | 178 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 171 | 0 | ||
| Coliform, fecal general | 0 | 81 | 0 | ||
| pH | 2 | 66 | 0 | ||
| Flow rate | 0 | 55 | 0 | ||
| E. coli, MTEC-MF | 2 | 50 | 0 | ||
| Oil & Grease | 1 | 48 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 47 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 44 | 0 | ||
| E. coli | 0 | 42 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 27 | 0 | ||
| Oil and grease visual | 1 | 15 | 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 MT0023388.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MT0023388.
Start the watch
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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 MT0023388 there.
Nearby on the register
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- Every permit record in Polson, A to Z
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- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.