DONNER SUMMIT WWTP
NPDES ID: CA0081621
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
February 28, 2026
Zinc, total recoverable
67% over limit
Discharged 0.05 mg/L against a permitted limit of 0.03 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Zinc, total recoverable
230% over limit
Discharged 0.099 mg/L against a permitted limit of 0.03 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Zinc, total recoverable
100% over limit
Discharged 0.12000001 mg/L against a permitted limit of 0.06 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
82% over limit
Discharged 6.9 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Zinc, total recoverable
23% over limit
Discharged 0.037 mg/L against a permitted limit of 0.03 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, 20 deg. C
Limit violation
Discharged 3 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Zinc, total recoverable
87% over limit
Discharged 0.056 mg/L against a permitted limit of 0.03 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
Limit violation
Discharged 0.05 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, suspended percent removal
Limit violation
Discharged 96 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
July 31, 2024
BOD, 5-day, 20 deg. C
Limit violation
Discharged 3 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)