Clean Water Act discharge permit · NPDES MTG310059
UNIT 1 NEW BATTERY UNIT 1, Winnett, MT: NPDES MTG310059 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
UNIT 1 NEW BATTERY UNIT 1, held by CAT CREEK HOLDINGS LLC, holds NPDES permit MTG310059, which discharges to Lower Musselshell. EPA’s file records it issued January 19, 2016 and expiring April 30, 2020. 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 | UNIT 1 NEW BATTERY UNIT 1 |
|---|---|
| Permittee as filed | CAT CREEK HOLDINGS LLC |
| NPDES ID | MTG310059 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | January 19, 2016 |
| Expiration date | April 30, 2020 |
| Address | Winnett, MT 59087 |
| Receiving water | Lower Musselshell |
| Subwatershed | Musselshell River-Long Coulee (HUC 100402050104) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 19Pollutants on file
- 5Under a numeric limit
- 19With a violation of any kind
- 1With 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 |
|---|---|---|---|---|---|
| Oil and grease, hexane extr method | 2 | 14 | 3 | June 30, 2020 | 250% over the limit |
| Conductivity | 4 | 25 | 0 | ||
| Sulfate, total [as SO4] | 4 | 22 | 0 | ||
| Flow rate | 2 | 14 | 0 | ||
| Solids, total dissolved [TDS] | 2 | 13 | 0 | ||
| pH | 0 | 8 | 0 | ||
| Fluoride | 0 | 3 | 0 | ||
| Arsenic, total recoverable | 0 | 3 | 0 | ||
| Cobalt, total recoverable | 0 | 3 | 0 | ||
| Selenium, total recoverable | 0 | 3 | 0 | ||
| Zinc, total recoverable | 0 | 3 | 0 | ||
| Cadmium, total recoverable | 0 | 3 | 0 | ||
| Lead, total recoverable | 0 | 3 | 0 | ||
| Chromium, total recoverable | 0 | 3 | 0 | ||
| Copper, total recoverable | 0 | 3 | 0 | ||
| Oil & Grease | 0 | 2 | 0 | ||
| Nitrogen, nitrite total [as N] | 0 | 2 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 2 | 0 | ||
| Sulfate | 0 | 2 | 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 |
|---|---|---|
| August 1, 2017 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| August 1, 2017 | Reporting Violations - Failure to Submit DMRs | 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
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, MTG310059.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MTG310059 there.
Nearby on the register
- Discharge permits in Winnett
- Every permit record in Winnett, A to Z
- Discharge permits in Montana
- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.