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City of Le Mars

Sewage treatment plant, major discharger, Le Mars, Iowa. NPDES permit IA0036536, in force until Jul 31, 2029. Last 12 months: over a limit 2 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (18 values)
Last report on file
September 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
March 2026Nitrogen, ammonia total [as N], daily maximum16.3≤ 15 mg/L9%
May 2026Nitrogen, ammonia total [as N], 30-day average3.761612≤ 3.5 mg/L7%

Limits in force (62)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.3 mg/Lall year
pHdaily minimum≥ 6.5 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≤ 898 lb/dall year
Solids, total suspended7-day average≤ 1347 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 6.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 8 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 6.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 14.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 191.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 86.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 140.8 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 223.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 59.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 88.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 74.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 98.7 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 194.3 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 57 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 54.1 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 132.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 447.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 476.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 484.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 434 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 500.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 477 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 439.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 462.1 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 462.9 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 534.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 493.5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 446.2 lb/dNov
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≤ 748 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1198 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/IA0036536 · MCP: https://passage-data.com/mcp