SUNCOR ENERGY (USA) INC - COMMERCE CITY REFINERY
NPDES ID: CO0001147
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 3 effluent violations, 2 permit schedule violations.
Violations
May 31, 2026
Oil and grease
70% over limit
Discharged 17 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia
90% over limit
Discharged 8.5 toxic against a permitted limit of 89 toxic (MN VALUE)
DMR, Limited - Numeric Violation
April 30, 2026
Oxygen, dissolved [DO]
60% over limit
Discharged 8 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Oil and grease
180% over limit
Discharged 28 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Total PFOA and PFOS
6% over limit
Discharged 0.000074 mg/L against a permitted limit of 0.00007 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Oxygen, dissolved [DO]
60% over limit
Discharged 8 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Oxygen, dissolved [DO]
60% over limit
Discharged 8 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Temperature, water deg. centigrade
0% over limit
Discharged 0 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 0 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
60% over limit
Discharged 8 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, weak acid, dissociable
140% over limit
Discharged 0.012 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, weak acid, dissociable
140% over limit
Discharged 0.012 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
14% over limit
Discharged 0.008 mg/L against a permitted limit of 0.007 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oil and grease
85% over limit
Discharged 18.5 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Oil and grease
21% over limit
Discharged 12.1 mg/L against a permitted limit of 10 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, weak acid, dissociable
100% over limit
Discharged 0.01 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Temperature, water deg. centigrade
6% over limit
Discharged 31.2 deg C against a permitted limit of 29.5 deg C (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, weak acid, dissociable
160% over limit
Discharged 0.013 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Oil and grease
110% over limit
Discharged 21 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
2% over limit
Discharged 31.3 deg C against a permitted limit of 30.6 deg C (DAILY MX)
DMR, Limited - Numeric Violation
Arsenic, total recoverable
14% over limit
Discharged 0.008 mg/L against a permitted limit of 0.007 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
42% over limit
Discharged 64 mg/L against a permitted limit of 45 mg/L (MX 7D AV)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 31 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oil and grease
137% over limit
Discharged 23.7 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Numeric Violation
March 31, 2025
TU Static Renewal 7-Day Chronic Ceriodaphnia dubia
71% over limit
Discharged 25.7 toxic against a permitted limit of 89 toxic (MN VALUE)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, weak acid, dissociable
18% over limit
Discharged 0.02 mg/L against a permitted limit of 0.017 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Oxygen, dissolved [DO]
40% over limit
Discharged 7 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Sulfate
0% over limit
Discharged 251 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Oxygen, dissolved [DO]
20% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Sulfate
6% over limit
Discharged 266 mg/L against a permitted limit of 250 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)