FCA US LLC-CHELSEA PROVING GROUNDS
NPDES ID: MI0046540
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: 3 effluent violations.
Violations
May 31, 2026
Solids, total dissolved
3% over limit
Discharged 1850 mg/L against a permitted limit of 1800 mg/L (MO MAX)
DMR, Limited - Numeric Violation
Solids, total dissolved
229% over limit
Discharged 2982.77997494 kg/d against a permitted limit of 907.99999237 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved
71% over limit
Discharged 3728.70196867 kg/d against a permitted limit of 2179.19998169 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, total dissolved
33% over limit
Discharged 3200 mg/L against a permitted limit of 2400 mg/L (MO MAX)
DMR, Limited - Numeric Violation
Solids, total dissolved
5% over limit
Discharged 1233.97198963 kg/d against a permitted limit of 1180.39999008 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total dissolved
44% over limit
Discharged 1703.40798569 kg/d against a permitted limit of 1180.39999008 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved
27% over limit
Discharged 3050 mg/L against a permitted limit of 2400 mg/L (MO MAX)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total dissolved
8% over limit
Discharged 2600 mg/L against a permitted limit of 2400 mg/L (MO MAX)
DMR, Limited - Numeric Violation
August 31, 2025
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
pH
0% over limit
Discharged 9.6 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved
111% over limit
Discharged 4597.65796137 kg/d against a permitted limit of 2179.19998169 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved
199% over limit
Discharged 2712.64997721 kg/d against a permitted limit of 907.99999237 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total dissolved
38% over limit
Discharged 8128.8699317 kg/d against a permitted limit of 5901.99995041 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.9 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved
39% over limit
Discharged 3102.63597393 kg/d against a permitted limit of 2224.59998131 kg/d (MO MAX)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total dissolved
65% over limit
Discharged 3950 mg/L against a permitted limit of 2400 mg/L (MO MAX)
DMR, Limited - Numeric Violation
Solids, total dissolved
50% over limit
Discharged 1774.68598509 kg/d against a permitted limit of 1180.39999008 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total dissolved
15% over limit
Discharged 2750 mg/L against a permitted limit of 2400 mg/L (MO MAX)
DMR, Limited - Numeric Violation
December 31, 2024
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (7 hours ago)