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City of Ringsted

Sewage treatment plant, Ringsted, Iowa. NPDES permit IA0057436, in force until Aug 31, 2028. Last 12 months: over a limit 5 times (last May 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Renewal application due
Mar 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 11 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, geometric mean210.9256≤ 126 #/100mL67%
May 2026Nitrogen, ammonia total [as N], 30-day average24.65971≤ 11.8 lb/d109%
May 2026Nitrogen, ammonia total [as N], 30-day average3.85≤ 1.8 mg/L114%
May 2026Nitrogen, ammonia total [as N], daily maximum35.86867≤ 20.6 lb/d74%
May 2026Nitrogen, ammonia total [as N], daily maximum5.6≤ 3.2 mg/L75%

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 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≤ 3.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LDec
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 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 23.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 27.5 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 13.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 10.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 6.9 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 17.2 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 16.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 23.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 6.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 8.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 11.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 24.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 54 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 17 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 30.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 17 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 20.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 24.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 17 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 127.7 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 17 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 20.6 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 20.6 lb/dMay
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/IA0057436 · MCP: https://passage-data.com/mcp