Clean Water Act discharge permit · NPDES MTR000523
ASH GROVE CEMENT CO MONTANA CITY PLANT, Clancy, MT: NPDES MTR000523 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 1Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
ASH GROVE CEMENT CO MONTANA CITY PLANT, held by ASH GROVE CEMENT COMPANY, holds NPDES permit MTR000523, which discharges to Prickly Pear Creek. EPA’s file records it issued October 30, 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 | ASH GROVE CEMENT CO MONTANA CITY PLANT |
|---|---|
| Permittee as filed | ASH GROVE CEMENT COMPANY |
| NPDES ID | MTR000523 |
| 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 | October 30, 2018 |
| Expiration date | January 31, 2023 |
| Address | Clancy, MT 59634 |
| Receiving water | PRICKLY PEAR CREEK |
| Subwatershed | Middle Prickley Pear Creek (HUC 100301011308) |
| SIC | 1422 – Crushed And Broken Limestone |
| Other EPA IDs (FRS) | RCRA handler MTD986067825; ICIS-AIR source MT0000003004300001 |
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
- 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 | 3 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTR000523.
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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 24, 2026 | WW Storm Water Non-Construction - Failure to properly install/implement BMPs | ST6 |
| June 24, 2026 | Effluent Violations - Unauthorized Discharge | ST6 |
| July 27, 2021 | WW Storm Water Non-Construction - Failure to properly operate and maintain BMPs | ST6 |
| July 27, 2021 | WW Storm Water Non-Construction - Failure to properly install/implement BMPs | ST6 |
| July 27, 2021 | WW Storm Water Non-Construction - Failure to Maintain Records | ST6 |
| July 27, 2021 | WW Storm Water Non-Construction - Failure to Conduct Inspections | 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 MTR000523 there.
Nearby on the register
- Discharge permits in Clancy
- Every permit record in Clancy, A to Z
- Discharge permits in Montana
- Every permit record in Montana, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.