Clean Water Act discharge permit · NPDES MT0000485
TRIDENT, Three Forks, MT: NPDES MT0000485 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 14Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
TRIDENT, held by OLDCASTLE MATERIALS CEMENT HOLDINGS INC, holds NPDES permit MT0000485, which discharges to Missouri River. EPA’s file records it issued May 23, 2011 and expiring June 30, 2016. 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 | TRIDENT |
|---|---|
| Permittee as filed | OLDCASTLE MATERIALS CEMENT HOLDINGS INC |
| NPDES ID | MT0000485 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | May 23, 2011 |
| Expiration date | June 30, 2016 |
| Address | Three Forks, MT 59752 |
| Receiving water | MISSOURI RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Missouri River-Trident (HUC 100301010501) |
| SIC | 3241 – Cement, Hydraulic |
| Other EPA IDs (FRS) | RCRA handler MTD986066975; ICIS-AIR source MT0000003003100005 |
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
- 15Pollutants on file
- 14Under a numeric limit
- 11With a violation of any kind
- 4With 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 | 4 | 56 | 51 | July 31, 2026 | 204% over the limit |
| E. coli, MTEC-MF | 4 | 18 | 18 | July 31, 2026 | 860% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 18 | 13 | February 29, 2024 | 167% over the limit |
| Nitrogen, total [as N] | 2 | 10 | 7 | October 31, 2025 | 225% over the limit |
| Oil and grease visual | 0 | 6 | 0 | ||
| pH | 2 | 4 | 0 | ||
| Phosphorus, total [as P] | 2 | 3 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 3 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 2 | 0 | ||
| Flow rate | 2 | 1 | 0 | ||
| Temperature, water deg. centigrade | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| Oil and grease, hexane extr method | 1 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 26, 2024 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 13, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 13, 2020 | Monitoring Violations - Invalid/Unrepresentative Sample | 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 MT0000485 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.