MMPA-CONSTANTINE PLANT
NPDES ID: MI0001414
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: 11 effluent violations, 1 single-event violation.
Violations
May 31, 2026
Solids, total suspended
210% over limit
Discharged 80.7 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
387% over limit
Discharged 253 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
52% over limit
Discharged 117.63139901 kg/d against a permitted limit of 77.17999935 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
156% over limit
Discharged 406.32999659 kg/d against a permitted limit of 158.89999866 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
77% over limit
Discharged 1.77 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
185% over limit
Discharged 148 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.4 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 61 mg/L against a permitted limit of 42 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 39.3 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
19% over limit
Discharged 1.19 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
25% over limit
Discharged 197.85319834 kg/d against a permitted limit of 158.89999866 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, 5-day, 20 deg. C
84% over limit
Discharged 234.17319803 kg/d against a permitted limit of 127.11999893 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
17% over limit
Discharged 24.6 mg/L against a permitted limit of 21 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.3 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
350% over limit
Discharged 189 mg/L against a permitted limit of 42 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 56 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
3% over limit
Discharged 26.9 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 64 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Mercury, total [as Hg]
0% over limit
Discharged 0.00000272 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
5% over limit
Discharged 1.05 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
40% over limit
Discharged 73 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
0% over limit
Discharged 0.0000015 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0.0000015 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0.00000272 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Chloride [as Cl]
4% over limit
Discharged 663 mg/L against a permitted limit of 640 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
31% over limit
Discharged 34 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
12% over limit
Discharged 47 mg/L against a permitted limit of 42 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
BOD, 5-day, 20 deg. C
69% over limit
Discharged 71 mg/L against a permitted limit of 42 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
22% over limit
Discharged 31.6 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
125% over limit
Discharged 117 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, total suspended
306% over limit
Discharged 211 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
12% over limit
Discharged 29.2 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
37% over limit
Discharged 217.87459817 kg/d against a permitted limit of 158.89999866 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.3 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
66% over limit
Discharged 43.2 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 59 mg/L against a permitted limit of 42 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
142% over limit
Discharged 126 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
87% over limit
Discharged 0.4 mg/L against a permitted limit of 3 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.3 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, 5-day, 20 deg. C
43% over limit
Discharged 60 mg/L against a permitted limit of 42 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
54% over limit
Discharged 80 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Solids, total suspended
15% over limit
Discharged 30 mg/L against a permitted limit of 26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.29 SU against a permitted limit of 6.5 SU (DAILY MN)
DMR, Limited - Numeric Violation
Solids, total suspended
65% over limit
Discharged 262.1395978 kg/d against a permitted limit of 158.89999866 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
288% over limit
Discharged 202 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
17% over limit
Discharged 1.17 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
215% over limit
Discharged 164 mg/L against a permitted limit of 52 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)