DEERFIELD WASTEWATER TREATMENT FACILITY
NPDES ID: WI0023744
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: 5 effluent violations.
Violations
May 31, 2026
BOD, 5-day, 20 deg. C
82% over limit
Discharged 54.6667 mg/L against a permitted limit of 30 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
98% over limit
Discharged 39.6583 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Phosphorus, total [as P]
21% over limit
Discharged 1.2142 mg/L against a permitted limit of 1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
30% over limit
Discharged 39 mg/L against a permitted limit of 30 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 29 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, 5-day, 20 deg. C
82% over limit
Discharged 36.3333 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (5 days ago)