LONG GROVE CITY OF STP
NPDES ID: IA0022292
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
February 28, 2026
Chloride [as Cl]
16% over limit
Discharged 453 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Chloride [as Cl]
11% over limit
Discharged 430.5 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Chloride [as Cl]
15% over limit
Discharged 446 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Chloride [as Cl]
31% over limit
Discharged 509.5 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chloride [as Cl]
39% over limit
Discharged 540.6 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Chloride [as Cl]
29% over limit
Discharged 501.75 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Chloride [as Cl]
1% over limit
Discharged 393.2 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Chloride [as Cl]
13% over limit
Discharged 441.25 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Chloride [as Cl]
6% over limit
Discharged 410.6 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Chloride [as Cl]
19% over limit
Discharged 461.5 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Chloride [as Cl]
4% over limit
Discharged 405 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Chloride [as Cl]
32% over limit
Discharged 515.2 mg/L against a permitted limit of 389 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)