Clean Water Act discharge permit · NPDES MT0020559
CITY OF POLSON WWTP, Polson, MT: NPDES MT0020559 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
CITY OF POLSON WWTP, held by POLSON- CITY OF, holds NPDES permit MT0020559, which discharges to Flathead River. EPA’s file records it issued November 5, 2012 and expiring December 31, 2017. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CITY OF POLSON WWTP |
|---|---|
| Permittee as filed | POLSON- CITY OF |
| NPDES ID | MT0020559 |
| 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 | November 5, 2012 |
| Expiration date | December 31, 2017 |
| Address | Polson, MT 59860 |
| Receiving water | FLATHEAD RIVER |
| Subwatershed | Polson (HUC 170102080404) |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 18Pollutants on file
- 13Under a numeric limit
- 15With a violation of any kind
- 8With 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 | 2 | 274 | 160 | December 31, 2019 | 524% over the limit |
| E. coli | 2 | 128 | 124 | June 30, 2019 | 61,011% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 115 | 36 | April 30, 2019 | 77% over the limit |
| Solids, total suspended | 2 | 91 | 10 | January 31, 2020 | 491% over the limit |
| pH | 2 | 87 | 9 | May 31, 2012 | |
| BOD, 5-day, percent removal | 0 | 26 | 8 | December 31, 2019 | 233% over the limit |
| Solids, suspended percent removal | 0 | 3 | 3 | January 31, 2020 | 163% over the limit |
| Floating solids, waste or visible foam-visual | 0 | 20 | 1 | April 30, 2001 | |
| Oil & Grease | 1 | 50 | 0 | ||
| Oil and grease visual | 1 | 41 | 0 | ||
| Coliform, fecal general | 0 | 30 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 22 | 0 | ||
| Nitrogen, nitrate total [as N] | 1 | 22 | 0 | ||
| Nitrogen, nitrite total [as N] | 1 | 20 | 0 | ||
| E. coli, MTEC-MF | 0 | 19 | 0 | ||
| Nitrogen, total [as N] | 1 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Phosphorus, total [as P] | 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 MT0020559.
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 MT0020559 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 October 14, 2026.