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City of Forest City

Sewage treatment plant, major discharger, Forest City, Iowa. NPDES permit IA0021563, in force until Oct 31, 2030. 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 (42 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (86)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 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≥ 6.3 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≤ 413 lb/dall year
Solids, total suspended7-day average≤ 619 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≤ 223.8 lb/dall year
Nitrogen, total [as N]daily maximum≤ 366.4 lb/dall year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 5.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 12.7 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 5.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 11.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 7.2 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 8.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 14.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 14.8 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.6 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 18 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 16.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16.4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 51.4 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 31.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 129.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 38 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 56 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 34.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 33.1 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 67.4 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 112.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 50.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 76.8 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 81.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 222 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 102 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 205 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 122 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 193 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 113 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 96 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 209 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 217 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 221 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 207 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 226 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
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
E. coligeometric mean≤ 126 #/100mLMar–Nov
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year
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≤ 344 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 550 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/IA0021563 · MCP: https://passage-data.com/mcp