Clean Water Act discharge permit · NPDES MTG310058
EAST ELLIS SAND UNIT, Winnett, MT: NPDES MTG310058 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
EAST ELLIS SAND UNIT, held by CAT CREEK HOLDINGS LLC, holds NPDES permit MTG310058, which discharges to Unnamed Ephem Of Sage Hen Creek. EPA’s file records it issued August 3, 2015 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 | EAST ELLIS SAND UNIT |
|---|---|
| Permittee as filed | CAT CREEK HOLDINGS LLC |
| NPDES ID | MTG310058 |
| 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 | August 3, 2015 |
| Expiration date | April 30, 2020 |
| Address | Winnett, MT 59087 |
| Receiving water | UNNAMED EPHEM OF SAGE HEN CREEK |
| Subwatershed | Sage Hen Creek (HUC 100402050102) |
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
- 2With 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 | 1 | 8 | 2 | December 31, 2021 | 90% over the limit |
| Oil & Grease | 0 | 3 | 1 | June 30, 2026 | 190% over the limit |
| Conductivity | 2 | 15 | 0 | ||
| Sulfate, total [as SO4] | 2 | 12 | 0 | ||
| Flow rate | 1 | 9 | 0 | ||
| Solids, total dissolved [TDS] | 1 | 8 | 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 | ||
| 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
- 4Single-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 |
| August 1, 2017 | Effluent Violations - Numeric effluent violation | ST6 |
| August 1, 2017 | Management Practice Violations - Improper Operation and Maintenance | 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.
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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 MTG310058 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.