Clean Water Act discharge permit · NPDES MD0070629
CASSELMAN MINE, Grantsville, MD: NPDES MD0070629 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 27Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
CASSELMAN MINE, held by Maryland Energy Resources LLC, holds NPDES permit MD0070629, which discharges to Casselman River. EPA’s file records it issued February 14, 2017 and expiring February 28, 2022. 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 | CASSELMAN MINE |
|---|---|
| Permittee as filed | Maryland Energy Resources LLC |
| NPDES ID | MD0070629 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | February 14, 2017 |
| Expiration date | February 28, 2022 |
| Issuing agency | Maryland Department of the Environment |
| Address | Grantsville, MD 21536 |
| Receiving water | CASSELMAN RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Headwaters Casselman River (HUC 050200060401) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 28Pollutants on file
- 27Under a numeric limit
- 7With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 6 | 18 | 15 | February 28, 2017 | 156% over the limit |
| Solids, total suspended | 6 | 3 | 1 | February 29, 2012 | 7% over the limit |
| Iron, total [as Fe] | 6 | 6 | 0 | ||
| Manganese, total [as Mn] | 6 | 4 | 0 | ||
| Toxicity, Acute | 1 | 2 | 0 | ||
| pH | 6 | 1 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 1 | 0 | ||
| Specific conductance | 4 | 0 | 0 | ||
| Temp. diff. between up/down stream deg. F | 3 | 0 | 0 | ||
| Solids, settleable | 2 | 0 | 0 | ||
| Sulfate [as S] | 1 | 0 | 0 | ||
| Calcium, total [as Ca] | 1 | 0 | 0 | ||
| Magnesium, total [as Mg] | 1 | 0 | 0 | ||
| Arsenic, total [as As] | 1 | 0 | 0 | ||
| Beryllium, dissolved [as Be] | 1 | 0 | 0 | ||
| Beryllium, total [as Be] | 1 | 0 | 0 | ||
| Chromium, dissolved [as Cr] | 1 | 0 | 0 | ||
| Chromium, total [as Cr] | 1 | 0 | 0 | ||
| Thallium, dissolved [as Tl] | 1 | 0 | 0 | ||
| Thallium, total [as Tl] | 1 | 0 | 0 | ||
| Antimony, dissolved [as Sb] | 1 | 0 | 0 | ||
| Antimony, total [as Sb] | 1 | 0 | 0 | ||
| Aluminum, total [as Al] | 1 | 0 | 0 | ||
| Aluminum, dissolved [as Al] | 1 | 0 | 0 | ||
| Selenium, dissolved [as Se] | 1 | 0 | 0 | ||
| Selenium, total [as Se] | 1 | 0 | 0 | ||
| Mercury, dissolved [as Hg] | 1 | 0 | 0 | ||
| Mercury, total [as Hg] | 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 MD0070629.
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.
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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 MD0070629 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.