ARGONNE NATIONAL LABORATORY
NPDES ID: IL0034592
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 1 effluent violation.
Violations
May 31, 2026
Solids, total suspended
18% over limit
Discharged 14.2 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Mercury, total [as Hg]
167% over limit
Discharged 0.000032 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
8% over limit
Discharged 540 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Chloride [as Cl]
8% over limit
Discharged 540 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
42% over limit
Discharged 0.000017 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Mercury, total [as Hg]
17% over limit
Discharged 0.000014 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Chloride [as Cl]
38% over limit
Discharged 690 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Mercury, total [as Hg]
67% over limit
Discharged 0.00002 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Mercury, total [as Hg]
25% over limit
Discharged 0.000015 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Mercury, total [as Hg]
8% over limit
Discharged 0.000013 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Mercury, total [as Hg]
42% over limit
Discharged 0.000017 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Mercury, total [as Hg]
8% over limit
Discharged 0.000013 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
4% over limit
Discharged 520 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Chloride [as Cl]
22% over limit
Discharged 610 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Mercury, total [as Hg]
75% over limit
Discharged 0.000021 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
6% over limit
Discharged 530 mg/L against a permitted limit of 500 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Mercury, total [as Hg]
25% over limit
Discharged 0.000015 mg/L against a permitted limit of 0.000012 mg/L (ANNL AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, total suspended
60% over limit
Discharged 73.00319939 kg/d against a permitted limit of 45.62699962 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
125% over limit
Discharged 26.95 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 25.43761979 kg/d against a permitted limit of 22.79079981 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
233% over limit
Discharged 80 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (6 days ago)