Clean Water Act discharge permit · NPDES MTR000532
SAPPINGTON MILL, Three Forks, MT: NPDES MTR000532 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 1Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
SAPPINGTON MILL, held by MAGRIS TALC USA INC, holds NPDES permit MTR000532, which discharges to Jefferson River. EPA’s file records it issued September 7, 2018 and expiring January 31, 2023. 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 | SAPPINGTON MILL |
|---|---|
| Permittee as filed | MAGRIS TALC USA INC |
| NPDES ID | MTR000532 |
| 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 |
| Program | Industrial stormwater |
| Issued | September 7, 2018 |
| Expiration date | January 31, 2023 |
| Address | Three Forks, MT 59752 |
| Receiving water | JEFFERSON RIVER |
| Subwatershed | Jefferson River-Sappington (HUC 100200050802) |
| SIC | 1499 – Miscellaneous Nonmetallic Minerals |
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
- 1Pollutants on file
- 1Under a numeric limit
- 0With a violation of any kind
- 0With 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 | 1 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTR000532.
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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 26, 2025 | WW Storm Water Non-Construction - Failure to Maintain Records | ST6 |
| August 26, 2025 | WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| August 26, 2025 | WW Storm Water Non-Construction - Failure to Conduct Inspections | ST6 |
| April 5, 2018 | WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| April 5, 2018 | WW Storm Water Non-Construction - Failure to Conduct Inspections | ST6 |
| April 5, 2018 | WW Storm Water Non-Construction - Failure to Maintain Records | ST6 |
| April 5, 2018 | WW Storm Water Non-Construction - Failure to properly operate and maintain BMPs | 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 MTR000532 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.