SLOAN CITY OF STP
NPDES ID: IA0032361
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
May 31, 2026
Chloride [as Cl]
57% over limit
Discharged 662.5 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Chloride [as Cl]
61% over limit
Discharged 681.25 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Chloride [as Cl]
64% over limit
Discharged 690.6 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Chloride [as Cl]
63% over limit
Discharged 687 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Chloride [as Cl]
61% over limit
Discharged 681.25 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Chloride [as Cl]
55% over limit
Discharged 652 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Chloride [as Cl]
51% over limit
Discharged 638 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chloride [as Cl]
42% over limit
Discharged 599.5 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Chloride [as Cl]
28% over limit
Discharged 542 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Chloride [as Cl]
27% over limit
Discharged 537 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Chloride [as Cl]
145% over limit
Discharged 1983.29535134 kg/d against a permitted limit of 810.38999319 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
276% over limit
Discharged 1712.72951361 kg/d against a permitted limit of 455.81599617 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
32% over limit
Discharged 555.4 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Chloride [as Cl]
50% over limit
Discharged 634.5 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Chloride [as Cl]
49% over limit
Discharged 629.5 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
109% over limit
Discharged 3.132 mg/L against a permitted limit of 1.5 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
46% over limit
Discharged 614.8 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 4.09371751 kg/d against a permitted limit of 3.67739997 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
256% over limit
Discharged 1623.00413236 kg/d against a permitted limit of 455.81599617 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
105% over limit
Discharged 1664.48384201 kg/d against a permitted limit of 810.38999319 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
49% over limit
Discharged 628.5 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Chloride [as Cl]
49% over limit
Discharged 627 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Chloride [as Cl]
46% over limit
Discharged 617 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Chloride [as Cl]
47% over limit
Discharged 620 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Chloride [as Cl]
43% over limit
Discharged 602 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Chloride [as Cl]
40% over limit
Discharged 590 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Chloride [as Cl]
32% over limit
Discharged 557 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Chloride [as Cl]
24% over limit
Discharged 524.5 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Chloride [as Cl]
29% over limit
Discharged 542.4 mg/L against a permitted limit of 422 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)