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Winnebago Industries, Inc.

Motor Homes, major discharger, Forest City, Iowa. NPDES permit IA0067229, in force until May 31, 2031. Last 12 months: over a limit 16 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (13 values), outfall SUM form A monthly (44 values), outfall SUM form B monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
11 values over a limit, 0 required values missing, 0 of 36 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 16 values over a limit
Period endingOutfallParameterReportedLimitOver by
October 2025001pH, daily maximum9.3≤ 9 SU—
October 2025SUMAluminum, total [as Al], 30-day average.285353≤ .129 lb/d121%
October 2025SUMAluminum, total [as Al], daily maximum.808563≤ .252 lb/d221%
October 2025SUMSolids, total suspended, 30-day average3.03576≤ 2.235 lb/d36%
November 2025SUMAluminum, total [as Al], 30-day average.146492≤ .129 lb/d14%
November 2025SUMAluminum, total [as Al], daily maximum.265412≤ .252 lb/d5%
December 2025SUMSolids, total suspended, 30-day average38≤ 31 mg/L23%
January 2026SUMAluminum, total [as Al], 30-day average.18157≤ .129 lb/d41%
January 2026SUMAluminum, total [as Al], daily maximum.294235≤ .252 lb/d17%
April 2026SUMZinc, total [as Zn], 30-day average.169869≤ .024 lb/d608%
April 2026SUMZinc, total [as Zn], daily maximum.169869≤ .057 lb/d198%
May 2026001pH, daily maximum9.2≤ 9 SU—
May 2026SUMAluminum, total [as Al], 30-day average.319088≤ .129 lb/d147%
May 2026SUMAluminum, total [as Al], daily maximum.340272≤ .252 lb/d35%
May 2026SUMZinc, total [as Zn], 30-day average.148318≤ .024 lb/d518%
May 2026SUMZinc, total [as Zn], daily maximum.148318≤ .057 lb/d160%

Limits in force (71)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 80 mg/Lall year001
Solids, total suspended7-day average≤ 120 mg/Lall year001
Zinc, total [as Zn]30-day average≤ .2157 mg/Lall year001
Zinc, total [as Zn]daily maximum≤ .2157 mg/Lall year001
Zinc, total [as Zn]30-day average≤ 3.442 lb/dall year001
Zinc, total [as Zn]daily maximum≤ 3.442 lb/dall year001
E. coligeometric mean≤ 132 #/100mLall year001
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year001
pHdaily minimum≥ 7 SUall yearSUM
pHdaily minimum≥ 6 SUall yearSUM
pHdaily maximum≤ 10 SUall yearSUM
pHdaily maximum≤ 9 SUall yearSUM
Solids, total suspended30-day average≤ 31 mg/Lall yearSUM
Solids, total suspendeddaily maximum≤ 60 mg/Lall yearSUM
Solids, total suspended30-day average≤ 2.235 lb/dall yearSUM
Solids, total suspended30-day average≤ 3.88 lb/dall yearSUM
Solids, total suspendeddaily maximum≤ 4.698 lb/dall yearSUM
Solids, total suspendeddaily maximum≤ 7.51 lb/dall yearSUM
Oil & Grease30-day average≤ 26 mg/Lall yearSUM
Oil & Greasedaily maximum≤ 52 mg/Lall yearSUM
Oil & Grease30-day average≤ 3.25 lb/dall yearSUM
Oil & Grease30-day average≤ 1.375 lb/dall yearSUM
Oil & Greasedaily maximum≤ 6.5 lb/dall yearSUM
Oil & Greasedaily maximum≤ 2.292 lb/dall yearSUM
Cyanide, total [as CN]30-day average≤ .65 mg/Lall yearSUM
Cyanide, total [as CN]daily maximum≤ 1.2 mg/Lall yearSUM
Cyanide, total [as CN]30-day average≤ .005 lb/dall yearSUM
Cyanide, total [as CN]30-day average≤ .08 lb/dall yearSUM
Cyanide, total [as CN]daily maximum≤ .012 lb/dall yearSUM
Cyanide, total [as CN]daily maximum≤ .15 lb/dall yearSUM
Cadmium, total [as Cd]30-day average≤ .26 mg/Lall yearSUM
Cadmium, total [as Cd]daily maximum≤ .69 mg/Lall yearSUM
Cadmium, total [as Cd]30-day average≤ .03 lb/dall yearSUM
Cadmium, total [as Cd]daily maximum≤ .09 lb/dall yearSUM
Chromium, total [as Cr]30-day average≤ 1.71 mg/Lall yearSUM
Chromium, total [as Cr]daily maximum≤ 2.77 mg/Lall yearSUM
Chromium, total [as Cr]30-day average≤ .21 lb/dall yearSUM
Chromium, total [as Cr]30-day average≤ .007 lb/dall yearSUM
Chromium, total [as Cr]daily maximum≤ .35 lb/dall yearSUM
Chromium, total [as Cr]daily maximum≤ .017 lb/dall yearSUM
Copper, total [as Cu]30-day average≤ 2.07 mg/Lall yearSUM
Copper, total [as Cu]daily maximum≤ 3.38 mg/Lall yearSUM
Copper, total [as Cu]30-day average≤ .26 lb/dall yearSUM
Copper, total [as Cu]daily maximum≤ .42 lb/dall yearSUM
Lead, total [as Pb]30-day average≤ .43 mg/Lall yearSUM
Lead, total [as Pb]daily maximum≤ .69 mg/Lall yearSUM
Lead, total [as Pb]30-day average≤ .05 lb/dall yearSUM
Lead, total [as Pb]daily maximum≤ .09 lb/dall yearSUM
Nickel, total [as Ni]30-day average≤ 2.38 mg/Lall yearSUM
Nickel, total [as Ni]daily maximum≤ 3.98 mg/Lall yearSUM
Nickel, total [as Ni]30-day average≤ .3 lb/dall yearSUM
Nickel, total [as Ni]daily maximum≤ .5 lb/dall yearSUM
Silver, total [as Ag]30-day average≤ .24 mg/Lall yearSUM
Silver, total [as Ag]daily maximum≤ .43 mg/Lall yearSUM
Silver, total [as Ag]30-day average≤ .03 lb/dall yearSUM
Silver, total [as Ag]daily maximum≤ .05 lb/dall yearSUM
Zinc, total [as Zn]30-day average≤ 1.48 mg/Lall yearSUM
Zinc, total [as Zn]daily maximum≤ 2.61 mg/Lall yearSUM
Zinc, total [as Zn]30-day average≤ .024 lb/dall yearSUM
Zinc, total [as Zn]30-day average≤ .19 lb/dall yearSUM
Zinc, total [as Zn]daily maximum≤ .057 lb/dall yearSUM
Zinc, total [as Zn]daily maximum≤ .33 lb/dall yearSUM
Aluminum, total [as Al]30-day average≤ .129 lb/dall yearSUM
Aluminum, total [as Al]daily maximum≤ .252 lb/dall yearSUM
Organics, total toxic [TTO]daily maximum≤ 2.13 mg/Lall yearSUM
Organics, total toxic [TTO]daily maximum≤ .27 lb/dall yearSUM

How strict are these limits?

Cited limits by parameter: Iowa's rules and the federal ones.

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