DILLON COUNTY/GUM DROP MINE
NPDES ID: SCG731362
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
Violations
March 31, 2026
pH
0% over limit
Discharged 5.14 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Numeric Violation
October 31, 2025
pH
0% over limit
Discharged 5.06 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Numeric Violation
September 30, 2025
pH
0% over limit
Discharged 0 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 8.5 SU (INST MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 55 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 110 mg/L (DAILY MX)
DMR, Limited - Overdue
August 31, 2025
pH
0% over limit
Discharged 4.89 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Numeric Violation
April 30, 2025
pH
0% over limit
Discharged 5.41 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Numeric Violation
December 31, 2024
pH
0% over limit
Discharged 5.48 SU against a permitted limit of 6 SU (INST MIN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)