Clean Water Act discharge permit · NPDES MTG310060
HARLAN AND UNIT 2, Lewistown, MT: NPDES MTG310060 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
HARLAN AND UNIT 2, held by CAT CREEK HOLDINGS LLC, holds NPDES permit MTG310060, 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 (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | HARLAN AND UNIT 2 |
|---|---|
| Permittee as filed | CAT CREEK HOLDINGS LLC |
| NPDES ID | MTG310060 |
| 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 | Lewistown, MT 59457 |
| Receiving water | Lower Musselshell |
| Subwatershed | Cat Creek (HUC 100402050103) |
| SIC | 1311 – Crude Petroleum And Natural Gas |
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
- 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 & Grease | 0 | 11 | 3 | June 30, 2024 | 380% over the limit |
| Conductivity | 4 | 30 | 0 | ||
| Flow rate | 2 | 25 | 0 | ||
| Sulfate, total [as SO4] | 4 | 22 | 0 | ||
| pH | 0 | 22 | 0 | ||
| Solids, total dissolved [TDS] | 2 | 15 | 0 | ||
| Oil and grease, hexane extr method | 2 | 11 | 0 | ||
| Fluoride | 0 | 11 | 0 | ||
| Arsenic, total recoverable | 0 | 10 | 0 | ||
| Cobalt, total recoverable | 0 | 6 | 0 | ||
| Selenium, total recoverable | 0 | 6 | 0 | ||
| Zinc, total recoverable | 0 | 6 | 0 | ||
| Cadmium, total recoverable | 0 | 6 | 0 | ||
| Lead, total recoverable | 0 | 6 | 0 | ||
| Chromium, total recoverable | 0 | 6 | 0 | ||
| Copper, total recoverable | 0 | 6 | 0 | ||
| Nitrogen, nitrite total [as N] | 0 | 4 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 4 | 0 | ||
| Sulfate | 0 | 4 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 30, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| 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.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.