CITY OF MT. SHASTA WWTP
NPDES ID: CA0078051
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
Copper, total recoverable
36% over limit
Discharged 0.0136 mg/L against a permitted limit of 0.01 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Zinc, total recoverable
136% over limit
Discharged 0.0613 mg/L against a permitted limit of 0.026 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
33% over limit
Discharged 0.0613 mg/L against a permitted limit of 0.046 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Zinc, total recoverable
46% over limit
Discharged 0.0379 mg/L against a permitted limit of 0.026 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
.delta.-BHC
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Carbon tetrachloride
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (4 days ago)