INTERIOR TWP WWSL
NPDES ID: MIG580218
T — SNC: Compliance schedule reporting violation
The facility was more than 30 days late reporting progress on its compliance schedule.
This quarter: 1 effluent violation.
Violations
May 31, 2026
Oxygen, dissolved [DO]
28% over limit
Discharged 3.6 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
13% over limit
Discharged 45 mg/L against a permitted limit of 40 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, 5-day, 20 deg. C
10% over limit
Discharged 33 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
BOD, 5-day, 20 deg. C
2% over limit
Discharged 30.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Potassium, sludge, total, dry weight [as K]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Nitrogen, sludge, total, dry weight [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Selenium, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Mercury, sludge, total, dry weight [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Nitrogen, sludge, total, dry weight [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Phosphorus, sludge, total, dry weight [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MAX)
DMR, Monitor Only - Overdue
Mercury, sludge, total, dry weight [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, sludge, total, dry weight [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Cadmium, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Molybdenum, sludge, total, dry weight [as Mo]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Selenium, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Cadmium, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, sludge, total, dry weight [as P]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, sludge, total, dry weight [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MAX)
DMR, Monitor Only - Overdue
Zinc, sludge, total, dry weight [as Zn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Nitrogen, total Kjeldahl
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Lead, sludge, total, dry weight [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 840 mg/L (MO MAX)
DMR, Limited - Overdue
Mercury, sludge, total, dry weight [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 57 mg/L (MO MAX)
DMR, Limited - Overdue
Selenium, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 100 mg/L (MO MAX)
DMR, Limited - Overdue
Solids, total
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Nickel, sludge, total, dry weight [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 420 mg/L (MO MAX)
DMR, Limited - Overdue
Solids, total
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Cadmium, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 85 mg/L (MO MAX)
DMR, Limited - Overdue
Arsenic, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Copper, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 4300 mg/L (MO MAX)
DMR, Limited - Overdue
Potassium, sludge, total, dry weight [as K]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MAX)
DMR, Monitor Only - Overdue
Arsenic, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 75 mg/L (MO MAX)
DMR, Limited - Overdue
Copper, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Molybdenum, sludge, total, dry weight [as Mo]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Copper, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Zinc, sludge, total, dry weight [as Zn]
0% over limit
Discharged 0 mg/L against a permitted limit of 7500 mg/L (MO MAX)
DMR, Limited - Overdue
Lead, sludge, total, dry weight [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Lead, sludge, total, dry weight [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Zinc, sludge, total, dry weight [as Zn]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Arsenic, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Molybdenum, sludge, total, dry weight [as Mo]
0% over limit
Discharged 0 mg/L against a permitted limit of 75 mg/L (MO MAX)
DMR, Limited - Overdue
Nickel, sludge, total, dry weight [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
Solids, total
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MAX)
DMR, Monitor Only - Overdue
Potassium, sludge, total, dry weight [as K]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total Kjeldahl
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MAX)
DMR, Monitor Only - Overdue
Nickel, sludge, total, dry weight [as Ni]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total Kjeldahl
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)