Clean Water Act discharge permit · NPDES MT0000451
ASH GROVE CEMENT COMPANY - MONTANA CITY PLANT, Clancy, MT: NPDES MT0000451 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
ASH GROVE CEMENT COMPANY - MONTANA CITY PLANT, held by ASH GROVE CEMENT COMPANY, holds NPDES permit MT0000451, which discharges to Prickly Pear Creek. EPA’s file records it issued September 27, 2010 and expiring October 31, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | ASH GROVE CEMENT COMPANY - MONTANA CITY PLANT |
|---|---|
| Permittee as filed | ASH GROVE CEMENT COMPANY |
| NPDES ID | MT0000451 |
| 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 | September 27, 2010 |
| Expiration date | October 31, 2015 |
| Address | Clancy, MT 59634 |
| Receiving water | PRICKLY PEAR CREEK |
| Subwatershed | Middle Prickley Pear Creek (HUC 100301011308) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 13Under a numeric limit
- 6With a violation of any kind
- 2With 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 | 7 | 90 | 8 | April 30, 2018 | 1,150% over the limit |
| pH | 8 | 159 | 1 | February 28, 2011 | |
| Flow rate | 0 | 78 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 74 | 0 | ||
| Thermal Discharge | 0 | 37 | 0 | ||
| Flow rate | 8 | 1 | 0 | ||
| Oil and grease visual | 4 | 0 | 0 | ||
| Sulfate [as S] | 3 | 0 | 0 | ||
| Oil and grease, hexane extr method | 3 | 0 | 0 | ||
| Arsenic, total recoverable | 3 | 0 | 0 | ||
| Iron, total recoverable | 3 | 0 | 0 | ||
| Zinc, total recoverable | 3 | 0 | 0 | ||
| Aluminum, dissolved [as Al] | 3 | 0 | 0 | ||
| Cadmium, total recoverable | 3 | 0 | 0 | ||
| Lead, total recoverable | 3 | 0 | 0 | ||
| Copper, total recoverable | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 24, 2026 | Management Practice Violations - Failure to Maintain Records | ST6 |
| June 24, 2026 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 24, 2026 | Management Practice Violations - Best Management Practice Deficiencies | ST6 |
| July 27, 2021 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| July 27, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| July 27, 2021 | Management Practice Violations - Improper Operation and Maintenance | 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 MT0000451 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 September 15, 2026.