Clean Water Act discharge permit · NPDES MT0020125
CITY OF CHINOOK WWTP, Chinook, MT: NPDES MT0020125 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 17Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CITY OF CHINOOK WWTP, held by CITY OF CHINOOK, holds NPDES permit MT0020125, which discharges to Milk River. EPA’s file records it issued July 24, 2012 and expiring August 31, 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 | CITY OF CHINOOK WWTP |
|---|---|
| Permittee as filed | CITY OF CHINOOK |
| NPDES ID | MT0020125 |
| 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 | July 24, 2012 |
| Expiration date | August 31, 2017 |
| Issuing agency | MONTANA DEQ |
| Address | Chinook, MT 59523 |
| Receiving water | MILK RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Milk River-Sixteen Mile Creek (HUC 100500040603) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 23Pollutants on file
- 17Under a numeric limit
- 19With 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 |
|---|---|---|---|---|---|
| Nitrite + Nitrate total [as N] | 3 | 15 | 9 | January 31, 2010 | 20% over the limit |
| BOD, 5-day, percent removal | 1 | 7 | 4 | October 31, 2006 | 93% over the limit |
| Solids, suspended percent removal | 1 | 7 | 4 | October 31, 2006 | 87% over the limit |
| Nitrogen, total [as N] | 4 | 13 | 2 | June 30, 2011 | 21% over the limit |
| Coliform, fecal general | 0 | 7 | 2 | July 31, 1998 | 50% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 114 | 1 | September 30, 2003 | 1,080% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 6 | 1 | February 29, 2008 | 13% over the limit |
| Solids, total suspended | 6 | 119 | 0 | ||
| E. coli, MTEC-MF | 4 | 18 | 0 | ||
| Phosphorus, total [as P] | 4 | 14 | 0 | ||
| Temperature, water deg. centigrade | 2 | 9 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 7 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 7 | 0 | ||
| pH | 2 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 3 | 0 | ||
| Oil & Grease | 2 | 2 | 0 | ||
| Solids, total dissolved [TDS] | 0 | 1 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 0 | 1 | 0 | ||
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 0 | 1 | 0 | ||
| Report due [yrmoda] | 3 | 0 | 0 | ||
| Flow rate | 2 | 0 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 1 | 0 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 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 MT0020125.
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 MT0020125 there.
Nearby on the register
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- Every permit record in Chinook, 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.