CHRISTOPHER STP, CITY OF
NPDES ID: IL0020851
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
11% over limit
Discharged 41 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
5% over limit
Discharged 39 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
42% over limit
Discharged 64 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
73% over limit
Discharged 64 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
20% over limit
Discharged 48 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
92% over limit
Discharged 48 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
68% over limit
Discharged 62 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
43% over limit
Discharged 57 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
128% over limit
Discharged 57 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
38% over limit
Discharged 62 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
22% over limit
Discharged 45 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
76% over limit
Discharged 44 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
10% over limit
Discharged 44 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
November 30, 2025
BOD, carbonaceous [5 day, 20 C]
38% over limit
Discharged 34.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
BOD, carbonaceous [5 day, 20 C]
42% over limit
Discharged 35.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, carbonaceous [5 day, 20 C]
28% over limit
Discharged 32 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, carbonaceous [5 day, 20 C]
20% over limit
Discharged 30 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
33% over limit
Discharged 60 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
62% over limit
Discharged 60 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
8% over limit
Discharged 40 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
BOD, carbonaceous [5 day, 20 C]
4% over limit
Discharged 26 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
5% over limit
Discharged 39 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
40% over limit
Discharged 244.56979795 kg/d against a permitted limit of 174.33599854 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
36% over limit
Discharged 34 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
9% over limit
Discharged 280.52659764 kg/d against a permitted limit of 257.87199783 kg/d (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
BOD, carbonaceous [5 day, 20 C]
54% over limit
Discharged 38.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
22% over limit
Discharged 45 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
46% over limit
Discharged 36.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
19% over limit
Discharged 207.29639826 kg/d against a permitted limit of 174.33599854 kg/d (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
BOD, carbonaceous [5 day, 20 C]
18% over limit
Discharged 29.5 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
BOD, carbonaceous [5 day, 20 C]
12% over limit
Discharged 28 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, total suspended
16% over limit
Discharged 52 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
41% over limit
Discharged 52 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
11% over limit
Discharged 41 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.25 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
August 31, 2024
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 40 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)