Clean Water Act discharge permit · NPDES MTR000475
AMERICAN CHEMET CORPORATION, East Helena, MT: NPDES MTR000475 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 3Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
AMERICAN CHEMET CORPORATION holds NPDES permit MTR000475, which discharges to Prickly Pear Creek. EPA’s file records it issued May 24, 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 | AMERICAN CHEMET CORPORATION |
|---|---|
| Permittee as filed | AMERICAN CHEMET CORPORATION |
| NPDES ID | MTR000475 |
| 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 | May 24, 2018 |
| Expiration date | January 31, 2023 |
| Address | East Helena, MT 59635 |
| Receiving water | PRICKLY PEAR CREEK |
| Subwatershed | Lower Prickley Pear Gulch (HUC 100301011310) |
| SIC | 2819 – Industrial Inorganic Chemicals |
| Other EPA IDs (FRS) | RCRA handler MTD071408660 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 3Pollutants on file
- 3Under 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 |
|---|---|---|---|---|---|
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Iron, total [as Fe] | 1 | 0 | 0 | ||
| Aluminum, total [as Al] | 1 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTR000475.
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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 22, 2026 | WW Storm Water Non-Construction - Failure to Conduct Inspections | ST6 |
| April 22, 2026 | WW Storm Water Construction - Failure to properly operate and maintain BMPs | ST6 |
| April 22, 2026 | WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMP | ST6 |
| April 22, 2026 | WW Storm Water Non-Construction - Failure to Maintain Records | ST6 |
| September 11, 2019 | WW Storm Water Non-Construction - Failure to Conduct Inspections | ST6 |
| September 11, 2019 | WW Storm Water Non-Construction - Failure to Implement SWPPP/SWMP | ST6 |
| September 11, 2019 | WW Storm Water Non-Construction - Failure to Maintain Records | ST6 |
| September 11, 2019 | WW Storm Water Non-Construction - Failure to properly install/implement BMPs | ST6 |
| September 11, 2019 | 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 MTR000475 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.