IOWA TOWN OF SD #1
NPDES ID: LA0043605
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: 5 effluent violations, 2 reporting violations.
Violations
June 30, 2026
Nitrogen, ammonia total [as N]
3% over limit
Discharged 10.3 mg/L against a permitted limit of 10 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
61% over limit
Discharged 8.06 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
40% over limit
Discharged 13.38391989 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
33% over limit
Discharged 13.3 mg/L against a permitted limit of 10 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
9% over limit
Discharged 5.43 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
170% over limit
Discharged 62 mg/L against a permitted limit of 23 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 14.8 mg/L against a permitted limit of 10 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (INST MAX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
139% over limit
Discharged 11.97 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
38% over limit
Discharged 20.71 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (INST MAX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
14% over limit
Discharged 5.71 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
3% over limit
Discharged 5.15 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
47% over limit
Discharged 14.05129988 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
28% over limit
Discharged 6.42 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 11.3726999 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
37% over limit
Discharged 13.01617989 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
7% over limit
Discharged 5.35 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
36% over limit
Discharged 6.81 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
83% over limit
Discharged 17.46991985 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
50% over limit
Discharged 7.5 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
114% over limit
Discharged 20.38459983 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
72% over limit
Discharged 8.59 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
150% over limit
Discharged 23.8122998 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
31% over limit
Discharged 13.1 mg/L against a permitted limit of 10 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
9% over limit
Discharged 10.9 mg/L against a permitted limit of 10 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
115% over limit
Discharged 10.73 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
146% over limit
Discharged 23.4581798 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
108% over limit
Discharged 19.80801983 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
32% over limit
Discharged 13.2 mg/L against a permitted limit of 10 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
108% over limit
Discharged 10.41 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
37% over limit
Discharged 13.7 mg/L against a permitted limit of 10 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
119% over limit
Discharged 10.93 mg/L against a permitted limit of 5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
85% over limit
Discharged 17.62881985 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
51% over limit
Discharged 14.41903988 kg/d against a permitted limit of 9.53399992 kg/d (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (12 hours ago)