Clean Water Act discharge permit · NPDES MT0000230
MONTANA SULPHUR & CHEMICAL CO, Billings, MT: NPDES MT0000230 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
MONTANA SULPHUR & CHEMICAL CO, held by MONTANA SULPHUR AND CHEMICAL CO, holds NPDES permit MT0000230, which discharges to Dry Creek. EPA’s file records it issued February 4, 2014 and expiring March 31, 2019. 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 | MONTANA SULPHUR & CHEMICAL CO |
|---|---|
| Permittee as filed | MONTANA SULPHUR AND CHEMICAL CO |
| NPDES ID | MT0000230 |
| 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 | February 4, 2014 |
| Expiration date | March 31, 2019 |
| Address | Billings, MT 59101 |
| Receiving water | DRY CREEK |
| Subwatershed | Yellowstone River-Sevenmile Creek (HUC 100700070403) |
| SIC | 2819 – Industrial Inorganic Chemicals |
| Other EPA IDs (FRS) | RCRA handler MTD006233456; ICIS-AIR source MT0000003011100014 |
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
- 28Pollutants on file
- 11Under a numeric limit
- 25With a violation of any kind
- 3With 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 | 6 | 2 | February 28, 2006 | 28% over the limit |
| Temperature, water deg. fahrenheit | 1 | 4 | 1 | August 31, 2005 | 1% over the limit |
| pH | 2 | 3 | 1 | March 31, 2011 | |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | 1 | 3 | 0 | ||
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | 0 | 3 | 0 | ||
| Flow rate | 2 | 2 | 0 | ||
| Iron, total recoverable | 1 | 2 | 0 | ||
| Cadmium, total recoverable | 1 | 2 | 0 | ||
| Solids, total dissolved [TDS] | 1 | 1 | 0 | ||
| Nitrogen, total [as N] | 0 | 1 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 1 | 0 | ||
| Arsenic, total recoverable | 0 | 1 | 0 | ||
| Selenium, total recoverable | 0 | 1 | 0 | ||
| Thallium, total recoverable | 0 | 1 | 0 | ||
| Beryllium, total recoverable [as Be] | 0 | 1 | 0 | ||
| Nickel, total recoverable | 0 | 1 | 0 | ||
| Silver total recoverable | 0 | 1 | 0 | ||
| Zinc, total recoverable | 0 | 1 | 0 | ||
| Lead, total recoverable | 0 | 1 | 0 | ||
| Chromium, total recoverable | 0 | 1 | 0 | ||
| Copper, total recoverable | 0 | 1 | 0 | ||
| Antimony, total recoverable | 0 | 1 | 0 | ||
| Nitrogen, total Kjeldahl | 0 | 1 | 0 | ||
| Mercury, total recoverable | 0 | 1 | 0 | ||
| Sulfide, total | 0 | 1 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| Sulfide, total [as S] | 1 | 0 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MT0000230.
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 MT0000230 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.