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City of Humboldt

Sewage treatment plant, major discharger, Humboldt, Iowa. NPDES permit IA0047791, in force until Oct 31, 2030. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (41 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
December 2025Nitrogen, ammonia total [as N], daily maximum38≤ 18 mg/L111%

Limits in force (85)

ParameterStatisticLimitMonths
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 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≤ 473 lb/dall year
Solids, total suspended7-day average≤ 709 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 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≤ 16.7 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 12 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 11.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 17 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 9.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 7.4 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 8.4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 6.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 7.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 17.7 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 18 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 18.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.6 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 17.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 17.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 197.4 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 57.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 142.8 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 134.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 226.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 54.7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 60.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 117 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 87.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 99.9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 75.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 89.7 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 266.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 304.2 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 274.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 252.7 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 253.9 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 281.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 283.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 257.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 269.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 263.6 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 251.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 269.9 lb/dOct
Nitrogen, nitrate total [as N]30-day average≤ 270 lb/dall year
Nitrogen, nitrate total [as N]daily maximum≤ 442 lb/dall year
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. coli30-day average≤ 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≤ 394 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 631 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/IA0047791 · MCP: https://passage-data.com/mcp