OAKDALE, CITY OF
NPDES ID: LA0033430
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 15 effluent violations.
Violations
May 31, 2026
Whole Effluent Toxicity [WET] - C. dubia
100% over limit
Discharged 0 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
60% over limit
Discharged 12.82 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
157% over limit
Discharged 10.27 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 34.84449971 kg/d against a permitted limit of 27.69399977 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - C. dubia
100% over limit
Discharged 0 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
44% over limit
Discharged 11.48 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
77% over limit
Discharged 7.09 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Whole Effluent Toxicity [WET] - C. dubia
58% over limit
Discharged 41 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - C. dubia
58% over limit
Discharged 41 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
50% over limit
Discharged 6.01 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 28.43855976 kg/d against a permitted limit of 27.69399977 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - C. dubia
100% over limit
Discharged 0 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1% over limit
Discharged 8.08 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - C. dubia
100% over limit
Discharged 0 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
January 31, 2026
Whole Effluent Toxicity [WET] - C. dubia
100% over limit
Discharged 0 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - C. dubia
100% over limit
Discharged 0 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
September 30, 2025
Whole Effluent Toxicity [WET] - C. dubia
Limit violation
Discharged 31 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - C. dubia
Limit violation
Discharged 31 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - P. promelas
Limit violation
Discharged 31 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - P. promelas
Limit violation
Discharged 31 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
July 31, 2025
Whole Effluent Toxicity [WET] - C. dubia
Limit violation
Discharged 0.31 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 5.78 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
63% over limit
Discharged 13.04 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - C. dubia
Limit violation
Discharged 0.31 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - P. promelas
Limit violation
Discharged 0.31 % against a permitted limit of 97 % (MO AV MN)
DMR, Limited - Numeric Violation
Whole Effluent Toxicity [WET] - P. promelas
Limit violation
Discharged 0.31 % against a permitted limit of 97 % (7 DA MIN)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 30.65861974 kg/d against a permitted limit of 27.69399977 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
28% over limit
Discharged 10.26 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
84% over limit
Discharged 7.36 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
42% over limit
Discharged 39.34363967 kg/d against a permitted limit of 27.69399977 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
31% over limit
Discharged 10.5 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
95% over limit
Discharged 7.81 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
38% over limit
Discharged 5.52 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
2% over limit
Discharged 15.28 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
27% over limit
Discharged 35.1940797 kg/d against a permitted limit of 27.69399977 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
113% over limit
Discharged 17.03 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 24.76 mg/L against a permitted limit of 23 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
23% over limit
Discharged 9.85 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
76% over limit
Discharged 14.1 mg/L against a permitted limit of 8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
79% over limit
Discharged 7.17 mg/L against a permitted limit of 4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)