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City of Sheldon

Sewage treatment plant, major discharger, Sheldon, Iowa. NPDES permit IA0032662, in force until Apr 30, 2031. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (52 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (96)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
pH30-day averagereport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 757 lb/dall year
Solids, total suspended7-day average≤ 1135 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspended30-day averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 13.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 40.7 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 64.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 27.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 103.3 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 60.7 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 89.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 34.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 39.9 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 26.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 89 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 45.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 396.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 402.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 391 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 358.4 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 370.7 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 383.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 364.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 396.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 320.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 305.3 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 370.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 383.4 lb/dMay
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Chloride [as Cl]30-day average≤ 471 mg/Lall year
Chloride [as Cl]daily maximum≤ 708 mg/Lall year
Chloride [as Cl]30-day average≤ 11826 lb/dall year
Chloride [as Cl]daily maximum≤ 17853 lb/dall year
Sulfate, total [as SO4]30-day average≤ 2002 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 2002 mg/Lall year
Sulfate, total [as SO4]30-day average≤ 50483 lb/dall year
Sulfate, total [as SO4]daily maximum≤ 50483 lb/dall year
Copper, total [as Cu]30-day average≤ .0352 mg/Lall year
Copper, total [as Cu]daily maximum≤ .05822 mg/Lall year
Copper, total [as Cu]30-day average≤ .8722 lb/dall year
Copper, total [as Cu]daily maximum≤ 1.4679 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 631 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1009 lb/dall year

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/IA0032662 · MCP: https://passage-data.com/mcp