MASON WWTP
NPDES ID: MI0020435
D — SNC: Discharge monitoring report not received
The facility didn't submit its required discharge monitoring report.
This quarter: 1 single-event violation, 5 permit schedule violations.
Violations
January 31, 2026
Oxygen, dissolved [DO]
67% over limit
Discharged 2 mg/L against a permitted limit of 6 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
14% over limit
Discharged 12.5 mg/L against a permitted limit of 11 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Oxygen, dissolved [DO]
48% over limit
Discharged 3.1 mg/L against a permitted limit of 6 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
October 29, 2025
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
Copper, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO MIN)
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 MAX)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (5 days ago)