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City of Shell Rock

Sewage treatment plant, Shell Rock, Iowa. NPDES permit IA0033359, in force until Jan 31, 2027. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (31 values)
Renewal application due
Aug 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026Chlorine, total residual, 30-day average.272228≤ .225 lb/d21%
April 2026Chlorine, total residual, daily maximum.486639≤ .225 lb/d116%
July 2026Chlorine, total residual, daily maximum.240192≤ .225 lb/d7%

Limits in force (75)

ParameterStatisticLimitMonths
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 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≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 188 lb/dall year
Solids, total suspended7-day average≤ 282 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 average≤ 66.5 lb/dall year
Nitrogen, total [as N]daily maximum≤ 108.9 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 39.4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 38.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 71.6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 40.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 40.9 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 43.8 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 36.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 40.2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 76.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 38.3 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 38.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 55.8 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 39.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 38.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 71.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 40.9 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 40.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 43.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 36.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 40.2 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 76.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 38.3 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 38.3 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 55.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 53.6 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 50.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 98.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 54.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 54.9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 58.6 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 48 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 55.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 120.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 50.9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 50.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 74.2 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 53.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 50.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 98.8 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 54.9 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 54.9 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 58.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 48 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 55.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 120.2 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 50.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 50.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 74.2 lb/dMar
Chlorine, total residual30-day average≤ .163 mg/Lall year
Chlorine, total residualdaily maximum≤ .163 mg/Lall year
Chlorine, total residual30-day average≤ .225 lb/dall year
Chlorine, total residualdaily maximum≤ .225 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
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≤ 58 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 94 lb/dall year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0033359 · MCP: https://passage-data.com/mcp