WINNEBAGO INDUSTRIES, INC.
NPDES ID: IA0067229
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: 7 effluent violations.
Violations
May 31, 2026
Zinc, total [as Zn]
160% over limit
Discharged 0.06733637 kg/d against a permitted limit of 0.025878 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
147% over limit
Discharged 0.14486595 kg/d against a permitted limit of 0.058566 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
35% over limit
Discharged 0.15448349 kg/d against a permitted limit of 0.114408 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total [as Zn]
518% over limit
Discharged 0.06733637 kg/d against a permitted limit of 0.010896 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Zinc, total [as Zn]
608% over limit
Discharged 0.07712053 kg/d against a permitted limit of 0.010896 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, total [as Zn]
198% over limit
Discharged 0.07712053 kg/d against a permitted limit of 0.025878 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Aluminum, total [as Al]
17% over limit
Discharged 0.13358269 kg/d against a permitted limit of 0.114408 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
41% over limit
Discharged 0.08243278 kg/d against a permitted limit of 0.058566 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
23% over limit
Discharged 38 mg/L against a permitted limit of 31 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Aluminum, total [as Al]
14% over limit
Discharged 0.06650737 kg/d against a permitted limit of 0.058566 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
5% over limit
Discharged 0.12049705 kg/d against a permitted limit of 0.114408 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
121% over limit
Discharged 0.12955026 kg/d against a permitted limit of 0.058566 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
221% over limit
Discharged 0.3670876 kg/d against a permitted limit of 0.114408 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
36% over limit
Discharged 1.37823503 kg/d against a permitted limit of 1.01468999 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Aluminum, total [as Al]
134% over limit
Discharged 0.13690234 kg/d against a permitted limit of 0.058566 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
131% over limit
Discharged 0.26371997 kg/d against a permitted limit of 0.114408 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Zinc, total [as Zn]
1% over limit
Discharged 0.01099543 kg/d against a permitted limit of 0.010896 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
10% over limit
Discharged 34 mg/L against a permitted limit of 31 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Aluminum, total [as Al]
89% over limit
Discharged 0.21627652 kg/d against a permitted limit of 0.114408 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
112% over limit
Discharged 0.12404097 kg/d against a permitted limit of 0.058566 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
1% over limit
Discharged 1.02269583 kg/d against a permitted limit of 1.01468999 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
40% over limit
Discharged 0.08219034 kg/d against a permitted limit of 0.058566 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
26% over limit
Discharged 0.144298 kg/d against a permitted limit of 0.114408 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.5 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2024
Oil & Grease
0% over limit
Discharged 0 kg/d against a permitted limit of 1.04056799 kg/d (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
35% over limit
Discharged 42 mg/L against a permitted limit of 31 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oil & Grease
0% over limit
Discharged 0 kg/d against a permitted limit of 0.62424999 kg/d (30DA AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 16, 2026 (7 hours ago)