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City of Marble Rock

Sewage treatment plant, Marble Rock, Iowa. NPDES permit IA0057207, in force until Jan 31, 2031. 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 (11 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 8.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 28 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 8.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 7.9 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 10.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 8.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 20.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 20.6 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 18.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 28 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 7.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 10.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 20.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 20.6 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 18.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 44.2 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 140 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 80.1 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 44.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 39.7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 51 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 42.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 34.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 103.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 103 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 50.1 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 94.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 44.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 140 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 80.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 44.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 39.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 51 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 42.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 34.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 103.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 103 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 50.1 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 94.8 lb/dApr
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

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/IA0057207 · MCP: https://passage-data.com/mcp