EMMETSBURG CITY OF STP
NPDES ID: IA0021580
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: 3 effluent violations.
Violations
May 31, 2026
Chloride [as Cl]
59% over limit
Discharged 682.25 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
18% over limit
Discharged 830 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Chloride [as Cl]
9% over limit
Discharged 467.5 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Chloride [as Cl]
49% over limit
Discharged 638.4 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
22% over limit
Discharged 857 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Chloride [as Cl]
20% over limit
Discharged 847 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
92% over limit
Discharged 824.25 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
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
Chloride [as Cl]
76% over limit
Discharged 756.25 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
15% over limit
Discharged 807 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Toxicity [acute], Ceriodaphnia dubia
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 1 pass=0;fail=1 (DAILY MX)
DMR, Limited - Overdue
December 31, 2025
Chloride [as Cl]
64% over limit
Discharged 1150 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
139% over limit
Discharged 1025 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Chloride [as Cl]
84% over limit
Discharged 789.25 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
39% over limit
Discharged 979 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Oxygen, dissolved [DO]
1% over limit
Discharged 5.96 mg/L against a permitted limit of 6 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Chloride [as Cl]
32% over limit
Discharged 929 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
107% over limit
Discharged 889.75 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Oxygen, dissolved [DO]
0% over limit
Discharged 5.99 mg/L against a permitted limit of 6 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Chloride [as Cl]
59% over limit
Discharged 682.4 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
9% over limit
Discharged 769 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Chloride [as Cl]
25% over limit
Discharged 535.5 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Chloride [as Cl]
16% over limit
Discharged 496.122 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Chloride [as Cl]
0% over limit
Discharged 706 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
34% over limit
Discharged 572.75 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Chloride [as Cl]
59% over limit
Discharged 681 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
14% over limit
Discharged 801 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Chloride [as Cl]
52% over limit
Discharged 1070 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
94% over limit
Discharged 831.6 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Chloride [as Cl]
41% over limit
Discharged 991 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
122% over limit
Discharged 952.5 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Chloride [as Cl]
116% over limit
Discharged 926.5 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
44% over limit
Discharged 1010 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Chloride [as Cl]
54% over limit
Discharged 1080 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
131% over limit
Discharged 991.6 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Chloride [as Cl]
133% over limit
Discharged 999.5 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
55% over limit
Discharged 1090 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Chloride [as Cl]
142% over limit
Discharged 1037 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
76% over limit
Discharged 1240 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Chloride [as Cl]
19% over limit
Discharged 838 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
52% over limit
Discharged 650.25 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
15% over limit
Discharged 5.12 mg/L against a permitted limit of 6 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
August 31, 2024
Oxygen, dissolved [DO]
8% over limit
Discharged 5.55 mg/L against a permitted limit of 6 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
42% over limit
Discharged 1.42 mg/L against a permitted limit of 1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
81% over limit
Discharged 776.25 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
15% over limit
Discharged 809 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2024
Chloride [as Cl]
20% over limit
Discharged 847 mg/L against a permitted limit of 703 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
41% over limit
Discharged 602.8 mg/L against a permitted limit of 429 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
117% over limit
Discharged 8664.88502719 kg/d against a permitted limit of 3993.38396645 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
108% over limit
Discharged 5071.67481739 kg/d against a permitted limit of 2436.16397953 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)