Clean Water Act discharge permit · NPDES MT0000264
CHS INC, Laurel, MT: NPDES MT0000264 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 27Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
CHS INC holds NPDES permit MT0000264, which discharges to Yellowstone River. EPA’s file records it issued September 16, 2015 and expiring October 31, 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 | CHS INC |
|---|---|
| Permittee as filed | CHS INC |
| NPDES ID | MT0000264 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | September 16, 2015 |
| Expiration date | October 31, 2020 |
| Address | Laurel, MT 59044 |
| Receiving water | YELLOWSTONE RIVER |
| Subwatershed | Yellowstone River-Indian Creek (HUC 100700040602) |
| SIC | 2911 – Petroleum Refining |
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
- 32Pollutants on file
- 27Under a numeric limit
- 31With a violation of any kind
- 11With 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 |
|---|---|---|---|---|---|
| pH | 7 | 32 | 26 | July 31, 2009 | |
| BOD, 5-day, 20 deg. C | 12 | 27 | 19 | May 31, 2024 | 99,999% over the limit |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 3 | 13 | 10 | June 30, 2026 | |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 3 | 11 | 9 | December 31, 2025 | |
| Solids, total suspended | 24 | 20 | 3 | June 30, 2025 | 17% over the limit |
| Oxygen demand, chem. [high level] [COD] | 0 | 3 | 3 | May 31, 2014 | 60% over the limit |
| Chromium, hexavalent [as Cr] | 12 | 14 | 2 | July 31, 2008 | 33% over the limit |
| Nitrogen, ammonia total [as N] | 16 | 12 | 2 | January 31, 2025 | 28% over the limit |
| Oil & Grease | 12 | 10 | 2 | September 30, 2020 | 160% over the limit |
| Chemical Oxygen Demand [COD] | 12 | 10 | 1 | February 29, 2024 | 25% over the limit |
| Oil and grease, hexane extr method | 0 | 1 | 1 | November 30, 2023 | 90% over the limit |
| Phenol | 12 | 14 | 0 | ||
| Chromium, total recoverable | 12 | 12 | 0 | ||
| Sulfide, total [as S] | 12 | 8 | 0 | ||
| Temperature, water deg. centigrade | 6 | 7 | 0 | ||
| Hydrogen sulfide | 11 | 5 | 0 | ||
| Flow rate | 6 | 5 | 0 | ||
| Selenium, total recoverable | 14 | 4 | 0 | ||
| Chlorine, total residual | 6 | 4 | 0 | ||
| Sulfide, dissolved, [as S] | 7 | 3 | 0 | ||
| Nitrite + Nitrate total [as N] | 24 | 2 | 0 | ||
| Fluoride | 14 | 2 | 0 | ||
| Arsenic, total recoverable | 14 | 2 | 0 | ||
| Phosphorus, total [as P] | 6 | 2 | 0 | ||
| Nitrogen, total [as N] | 5 | 2 | 0 | ||
| Lead, total recoverable | 3 | 2 | 0 | ||
| Cyanide [A] | 3 | 2 | 0 | ||
| Mercury, total recoverable | 3 | 2 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 2 | 0 | ||
| Iron, total recoverable | 0 | 2 | 0 | ||
| Aluminum, dissolved [as Al] | 0 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 3 | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 11, 2026 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| February 11, 2026 | Management Practice Violations - Failure to Maintain Records | ST6 |
| August 16, 2024 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| August 16, 2024 | Effluent Violations - Failed Toxicity Test | ST6 |
| August 16, 2024 | Effluent Violations - Numeric effluent violation | 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 MT0000264 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.