OELWEIN CITY OF STP
NPDES ID: IA0032344
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: 10 effluent violations, 6 permit schedule violations.
Violations
June 30, 2026
Nitrogen, ammonia total [as N]
28% over limit
Discharged 19.51228878 kg/d against a permitted limit of 15.29979987 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4% over limit
Discharged 63.07285747 kg/d against a permitted limit of 60.47279949 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
33% over limit
Discharged 10.6 mg/L against a permitted limit of 8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
107% over limit
Discharged 3.725615 mg/L against a permitted limit of 1.8 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Nitrogen, ammonia total [as N]
57% over limit
Discharged 14.4 mg/L against a permitted limit of 9.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
92% over limit
Discharged 40.72966988 kg/d against a permitted limit of 21.20179982 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (5 days ago)