SHANNON HILLS, CITY OF
NPDES ID: AR0050636
T — SNC: Compliance schedule reporting violation
The facility was more than 30 days late reporting progress on its compliance schedule.
This quarter: 3 effluent violations.
Violations
May 31, 2026
pH
0% over limit
Discharged 5.67 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
22% over limit
Discharged 7.34 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
40% over limit
Discharged 8.51 mg/L against a permitted limit of 6.1 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
120% over limit
Discharged 32.00699973 kg/d against a permitted limit of 14.57339988 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
187% over limit
Discharged 17.2 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
118% over limit
Discharged 19.6 mg/L against a permitted limit of 9 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
56% over limit
Discharged 14 mg/L against a permitted limit of 9 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
92% over limit
Discharged 11.5 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
30% over limit
Discharged 19.5 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
27% over limit
Discharged 46.27621961 kg/d against a permitted limit of 36.41079969 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
18% over limit
Discharged 26.5 mg/L against a permitted limit of 22.5 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
pH
0% over limit
Discharged 5.33 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
174% over limit
Discharged 39.97469966 kg/d against a permitted limit of 14.57339988 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
167% over limit
Discharged 16.01 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
379% over limit
Discharged 29.2 mg/L against a permitted limit of 6.1 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
80% over limit
Discharged 16.2 mg/L against a permitted limit of 9 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
140% over limit
Discharged 14.4 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
114% over limit
Discharged 31.19433974 kg/d against a permitted limit of 14.57339988 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
89% over limit
Discharged 27.60319977 kg/d against a permitted limit of 14.57339988 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
155% over limit
Discharged 15.3 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
76% over limit
Discharged 15.8 mg/L against a permitted limit of 9 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
61% over limit
Discharged 14.5 mg/L against a permitted limit of 9 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
138% over limit
Discharged 14.3 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 18.38699985 kg/d against a permitted limit of 14.57339988 kg/d (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
4% over limit
Discharged 23.5 mg/L against a permitted limit of 22.5 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)