DOON CITY OF STP
NPDES ID: IA0023736
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: 8 effluent violations, 2 compliance schedule violations.
Violations
June 30, 2026
BOD, carbonaceous [5 day, 20 C]
56% over limit
Discharged 39 mg/L against a permitted limit of 25 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
83% over limit
Discharged 1200 mg/L against a permitted limit of 657 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
95% over limit
Discharged 1200 mg/L against a permitted limit of 615 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Chloride [as Cl]
83% over limit
Discharged 1200 mg/L against a permitted limit of 657 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
7% over limit
Discharged 1172.25704615 kg/d against a permitted limit of 1094.13999081 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chloride [as Cl]
14% over limit
Discharged 1172.25704615 kg/d against a permitted limit of 1025.13199139 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (4 days ago)