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City of Ridgeway

Sewage treatment plant, Ridgeway, Iowa. NPDES permit IA0058726, in force until Aug 31, 2029. Last 12 months: over a limit once (last April 2026), 47 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 16 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average16.0128≤ 13 lb/d23%

Limits in force (61)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year
pHdaily minimum≥ 6.4 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 15 lb/dall year
Solids, total suspended7-day average≤ 23 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 6.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 9.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 6.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 9.6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 7.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 7.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 6.4 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 9.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 9.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 9.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 7.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 7.7 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 9.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 7.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 3 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 2.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 3.4 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 1.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 2.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 1.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 2.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 1.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 3.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 3.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dJan
E. coligeometric mean≤ 630 #/100mLMar–Nov
E. coligeometric mean≤ 829 #/100mLJan, Feb, Dec
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≤ 13 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 20 lb/dall 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/IA0058726 · MCP: https://passage-data.com/mcp