CITY OF SOUTH SIOUX CITY
NPDES ID: NE0139904
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: 6 effluent violations.
Violations
May 31, 2026
Solids, total suspended
46% over limit
Discharged 333.88 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
13% over limit
Discharged 0.14200001 MPN/100mL against a permitted limit of 0.12600001 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
34% over limit
Discharged 459.72 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
21% over limit
Discharged 54.25 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
31% over limit
Discharged 39.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
269% over limit
Discharged 1.10000005 MPN/100mL against a permitted limit of 0.29800001 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
75% over limit
Discharged 52.43 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
176% over limit
Discharged 124.25 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
174% over limit
Discharged 941.42 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
73% over limit
Discharged 397.28 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
13% over limit
Discharged 259.41 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 56.75 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 30.96 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
38% over limit
Discharged 475.57 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
19% over limit
Discharged 272.7 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 32.06 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
32% over limit
Discharged 59.33 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 504.64 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
461% over limit
Discharged 1927.11 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
463% over limit
Discharged 168.98 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
536% over limit
Discharged 1458.66 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
396% over limit
Discharged 223.25 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, total suspended
611% over limit
Discharged 213.17 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
22% over limit
Discharged 30.43 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
745% over limit
Discharged 1937.07 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
68% over limit
Discharged 67 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1393% over limit
Discharged 5134.08 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
45% over limit
Discharged 276.47 kg/d against a permitted limit of 191 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1156% over limit
Discharged 565 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
99% over limit
Discharged 608.82 kg/d against a permitted limit of 305.6 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
August 31, 2025
E. coli, MTEC-MF
101% over limit
Discharged 0.60000003 MPN/100mL against a permitted limit of 0.29800001 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli, MTEC-MF
101% over limit
Discharged 0.25300001 MPN/100mL against a permitted limit of 0.12600001 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
6% over limit
Discharged 242.37 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 45.5 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
236% over limit
Discharged 1.00000005 MPN/100mL against a permitted limit of 0.29800001 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
10% over limit
Discharged 378.53 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
39% over limit
Discharged 319.02 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
33% over limit
Discharged 458.38 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
35% over limit
Discharged 60.67 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
41% over limit
Discharged 42.22 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, total suspended
1% over limit
Discharged 30.36 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
8% over limit
Discharged 32.33 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
60% over limit
Discharged 72 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 256.32 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
66% over limit
Discharged 570.78 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
177% over limit
Discharged 953.45 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
166% over limit
Discharged 119.5 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
110% over limit
Discharged 63.1 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
120% over limit
Discharged 503.45 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Solids, total suspended
27% over limit
Discharged 57 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 33.48 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
58% over limit
Discharged 0.19914291 MPN/100mL against a permitted limit of 0.12600001 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 247.86 kg/d against a permitted limit of 229.2 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, MTEC-MF
182% over limit
Discharged 0.84000004 MPN/100mL against a permitted limit of 0.29800001 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 421.99 kg/d against a permitted limit of 343.8 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)