CASTAIC POWER PLANT
NPDES ID: CA0055824
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
Solids, total suspended
97% over limit
Discharged 176.65139852 kg/d against a permitted limit of 89.89199924 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
22% over limit
Discharged 0.016 mg/L against a permitted limit of 0.0131 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
34% over limit
Discharged 67 mg/L against a permitted limit of 50 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
26% over limit
Discharged 0.0082 mg/L against a permitted limit of 0.0065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
195% over limit
Discharged 176.65139852 kg/d against a permitted limit of 59.9279995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Turbidity
0% over limit
Discharged 85 NTU against a permitted limit of 5 NTU (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
140% over limit
Discharged 180 mg/L against a permitted limit of 75 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Turbidity
0% over limit
Discharged 85 NTU against a permitted limit of 25 NTU (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
260% over limit
Discharged 180 mg/L against a permitted limit of 50 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
34% over limit
Discharged 45.53619962 kg/d against a permitted limit of 34.04999971 kg/d (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Copper, total recoverable
49% over limit
Discharged 0.0097 mg/L against a permitted limit of 0.0065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Copper, total recoverable
100% over limit
Discharged 0.00908 kg/d against a permitted limit of 0.00454 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
78% over limit
Discharged 0.0116 mg/L against a permitted limit of 0.0065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
50% over limit
Discharged 0.01362 kg/d against a permitted limit of 0.00908 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
45% over limit
Discharged 0.019 mg/L against a permitted limit of 0.0131 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Copper, total recoverable
7% over limit
Discharged 0.014 mg/L against a permitted limit of 0.0131 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
70% over limit
Discharged 0.007718 kg/d against a permitted limit of 0.00454 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
69% over limit
Discharged 0.011 mg/L against a permitted limit of 0.0065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Di[2-ethylhexyl] phthalate [DEHP]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.00227 kg/d (MO AVG)
DMR, Limited - Overdue
Di[2-ethylhexyl] phthalate [DEHP]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0018 mg/L (MO AVG)
DMR, Limited - Overdue
Di[2-ethylhexyl] phthalate [DEHP]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.0036 mg/L (DAILY MX)
DMR, Limited - Overdue
Copper, total recoverable
54% over limit
Discharged 0.01 mg/L against a permitted limit of 0.0065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Di[2-ethylhexyl] phthalate [DEHP]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.00454 kg/d (DAILY MX)
DMR, Limited - Overdue
September 30, 2024
Copper, total recoverable
43% over limit
Discharged 0.0093 mg/L against a permitted limit of 0.0065 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
BOD, 5-day, 20 deg. C
249% over limit
Discharged 41.22319965 kg/d against a permitted limit of 11.8039999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
320% over limit
Discharged 42 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
50% over limit
Discharged 15 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)