KEOKUK CITY OF STP
NPDES ID: IA0042609
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: 2 effluent violations.
Violations
April 30, 2026
Solids, total suspended
14% over limit
Discharged 34.22777 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
101% over limit
Discharged 90.275 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
139% over limit
Discharged 71.575 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
304% over limit
Discharged 181.75 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
45% over limit
Discharged 1234.65208163 kg/d against a permitted limit of 852.15799284 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
15% over limit
Discharged 45.825 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
172% over limit
Discharged 122.25 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 36.53125 mg/L against a permitted limit of 25 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
27% over limit
Discharged 50.6 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
254% over limit
Discharged 106.2 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
508% over limit
Discharged 273.5 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
257% over limit
Discharged 107.247 mg/L against a permitted limit of 30 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
33% over limit
Discharged 33.19411 mg/L against a permitted limit of 25 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
27% over limit
Discharged 50.725 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Toxicity [acute], Pimephales promelas [Fathead Minnow]
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 1 pass=0;fail=1 (DAILY MX)
DMR, Limited - Overdue
April 30, 2025
Solids, total suspended
47% over limit
Discharged 65.975 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
84% over limit
Discharged 1566.03258084 kg/d against a permitted limit of 852.15799284 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
57% over limit
Discharged 128.6 mg/L against a permitted limit of 82 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
81% over limit
Discharged 2804.42698444 kg/d against a permitted limit of 1552.22598696 kg/d (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
19% over limit
Discharged 898.22991245 kg/d against a permitted limit of 755.45599365 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
20% over limit
Discharged 48.1 mg/L against a permitted limit of 40 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, carbonaceous [5 day, 20 C]
39% over limit
Discharged 107.275 mg/L against a permitted limit of 77 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
50% over limit
Discharged 52.5375 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
51% over limit
Discharged 53 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 58.63888 mg/L against a permitted limit of 40 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
161% over limit
Discharged 214.1 mg/L against a permitted limit of 82 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
130% over limit
Discharged 176.75 mg/L against a permitted limit of 77 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
November 30, 2024
BOD, carbonaceous [5 day, 20 C]
148% over limit
Discharged 191 mg/L against a permitted limit of 77 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
109% over limit
Discharged 73.16875 mg/L against a permitted limit of 35 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)