SHELL DES PLAINES TERMINAL
NPDES ID: IL0046736
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
Solids, total suspended
100% over limit
Discharged 30 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oil & Grease
45% over limit
Discharged 21.7 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total suspended
780% over limit
Discharged 132 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
340% over limit
Discharged 132 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
293% over limit
Discharged 118 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
627% over limit
Discharged 109 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
147% over limit
Discharged 37 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
40% over limit
Discharged 42 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
pH
0% over limit
Discharged 5.52 SU against a permitted limit of 6 SU (MO MIN)
DMR, Limited - Numeric Violation
November 30, 2025
Oil & Grease
89% over limit
Discharged 28.4 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
63% over limit
Discharged 49 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.55 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Numeric Violation
Solids, total suspended
127% over limit
Discharged 34 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
170% over limit
Discharged 81 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
210% over limit
Discharged 46.5 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
280% over limit
Discharged 114 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
333% over limit
Discharged 65 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
pH
0% over limit
Discharged 5.72 SU against a permitted limit of 6 SU (MO MIN)
DMR, Limited - Numeric Violation
Oil & Grease
115% over limit
Discharged 32.2 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
220% over limit
Discharged 48 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oil & Grease
7% over limit
Discharged 32.2 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
137% over limit
Discharged 71 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.46 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total suspended
47% over limit
Discharged 22 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, total suspended
13% over limit
Discharged 17 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
2833% over limit
Discharged 440 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1367% over limit
Discharged 440 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, total suspended
87% over limit
Discharged 28 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, total suspended
140% over limit
Discharged 72 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
380% over limit
Discharged 72 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Solids, total suspended
50% over limit
Discharged 45 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
200% over limit
Discharged 45 mg/L against a permitted limit of 15 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)