Clean Water Act discharge permit · NPDES MT0020753
BIG TIMBER, Big Timber, MT: NPDES MT0020753 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
BIG TIMBER, held by CITY OF BIG TIMBER, holds NPDES permit MT0020753, which discharges to Boulder River. EPA’s file records it issued August 8, 2003 and expiring August 31, 2008. 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 | BIG TIMBER |
|---|---|
| Permittee as filed | CITY OF BIG TIMBER |
| NPDES ID | MT0020753 |
| 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 | August 8, 2003 |
| Expiration date | August 31, 2008 |
| Issuing agency | MONTANA DEQ |
| Address | Big Timber, MT 59011 |
| Receiving water | BOULDER RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Boulder River-Cherry Creek (HUC 100700020909) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 14Under a numeric limit
- 16With a violation of any kind
- 6With 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 | 78 | 67 | July 31, 2026 | 293% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 76 | 62 | January 31, 2023 | 370% over the limit |
| Solids, suspended percent removal | 1 | 33 | 31 | May 31, 2026 | 507% over the limit |
| Coliform, fecal general | 4 | 23 | 13 | January 31, 2015 | 525% over the limit |
| BOD, 5-day, percent removal | 1 | 15 | 13 | April 30, 2014 | 220% over the limit |
| pH | 2 | 6 | 2 | December 31, 2021 | |
| Phosphorus, total [as P] | 3 | 4 | 0 | ||
| Nitrogen, total [as N] | 3 | 2 | 0 | ||
| Temperature, water deg. fahrenheit | 1 | 2 | 0 | ||
| Flow rate | 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 | ||
| Chlorine, total residual | 1 | 2 | 0 | ||
| Copper, total recoverable | 0 | 2 | 0 | ||
| Flow rate | 0 | 1 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 2, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| June 2, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | 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.
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 MT0020753 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.