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City of Epworth

Sewage treatment plant, Epworth, Iowa. NPDES permit IA0036463, in force until Jun 30, 2031. Last 12 months: over a limit 4 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (34 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

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

Period endingParameterReportedLimitOver by
January 2026Chloride [as Cl], 30-day average581.25≤ 500 mg/L16%
January 2026pH, daily maximum9.15≤ 9 SU—
February 2026Chloride [as Cl], 30-day average607.5≤ 500 mg/L22%
March 2026Chloride [as Cl], 30-day average564.25≤ 500 mg/L13%

Limits in force (78)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.9 mg/Lall year
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≥ 6.5 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≤ 145 lb/dall year
Solids, total suspended7-day average≤ 218 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≤ 1.4 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.8 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.4 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 14.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 17.7 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 16.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 5.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 18.3 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 9.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 12.5 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 5.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 21.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 8.4 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 8.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 6.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 18.3 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 13.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 80.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 71.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 78.8 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 73.7 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 71.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 85.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 68.9 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 76.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 76.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 70.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 73.7 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 77.4 lb/dDec
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Chloride [as Cl]30-day average≤ 500 mg/Lall year
Chloride [as Cl]daily maximum≤ 754 mg/Lall year
Chloride [as Cl]30-day average≤ 2315 lb/dall year
Chloride [as Cl]daily maximum≤ 3628 lb/dall year
E. coligeometric mean≤ 630 #/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≤ 121 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 193 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/IA0036463 · MCP: https://passage-data.com/mcp