SIMI VALLEY WQCP
NPDES ID: CA0055221
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
Sulfate, total [as SO4]
40% over limit
Discharged 351 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved
17% over limit
Discharged 992 mg/L against a permitted limit of 850 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
32% over limit
Discharged 0.0054 mg/L against a permitted limit of 0.0041 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total dissolved
4% over limit
Discharged 886 mg/L against a permitted limit of 850 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Sulfate, total [as SO4]
35% over limit
Discharged 338 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Sulfate, total [as SO4]
68% over limit
Discharged 420 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved
25% over limit
Discharged 1061 mg/L against a permitted limit of 850 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Sulfate, total [as SO4]
9% over limit
Discharged 12881.34189177 kg/d against a permitted limit of 11831.23990059 kg/d (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Turbidity, time above limit
7% over limit
Discharged 0.05347222 d against a permitted limit of 0.05 d (MAXIMUM)
DMR, Limited - Numeric Violation
June 30, 2025
Sulfate, total [as SO4]
2% over limit
Discharged 255 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total dissolved
2% over limit
Discharged 871 mg/L against a permitted limit of 850 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Sulfate, total [as SO4]
10% over limit
Discharged 274 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Sulfate, total [as SO4]
12% over limit
Discharged 280 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total dissolved
1% over limit
Discharged 856 mg/L against a permitted limit of 850 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Sulfate, total [as SO4]
9% over limit
Discharged 272 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total dissolved
3% over limit
Discharged 872 mg/L against a permitted limit of 850 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Sulfate, total [as SO4]
4% over limit
Discharged 261 mg/L against a permitted limit of 250 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)