JOLIET WWTP
NPDES ID: MT0020249
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: 7 effluent violations.
Violations
May 31, 2026
Solids, suspended percent removal
120% over limit
Discharged 67 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
98% over limit
Discharged 89 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
129% over limit
Discharged 68.75 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
12% over limit
Discharged 6.7 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
98% over limit
Discharged 89 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
94% over limit
Discharged 58.2 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
53% over limit
Discharged 77 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
173% over limit
Discharged 16.3 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
39% over limit
Discharged 41.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
113% over limit
Discharged 68 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
174% over limit
Discharged 16.4 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
99% over limit
Discharged 11.9 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
33% over limit
Discharged 80 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
50% over limit
Discharged 8.95 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
70% over limit
Discharged 10.15 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
126% over limit
Discharged 13.5 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
7% over limit
Discharged 32 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
24% over limit
Discharged 7.4 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
228% over limit
Discharged 19.6 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
168% over limit
Discharged 16 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
23% over limit
Discharged 7.35 mg/L against a permitted limit of 5.98 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)