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City of Shellsburg

Sewage treatment plant, Shellsburg, Iowa. NPDES permit IA0033332 expired May 31, 2006; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (26 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

Limits in force (70)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 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≤ 120 lb/dall year
Solids, total suspended7-day average≤ 180 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, ammonia total [as N]30-day average≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 7.4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 6.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 9.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 11.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 8.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 7.7 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 11.1 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 14.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 9.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 11.2 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 9.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 34 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 24 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 10.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 29 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 46 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 52 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 40 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 17 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 30 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 24 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 36 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 30 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 36 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 36 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 30 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 30 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 52 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 62 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 43 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 30 lb/dApr
Flow, in conduit or thru treatment plant30-day average≤ .48 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ 1.15 MGDall 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≤ 100 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 160 lb/dall year
BOD, carbonaceous [5 day, 20 C]30-day averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]30-day averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0033332 · MCP: https://passage-data.com/mcp