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City of Harlan

Sewage treatment plant, major discharger, Harlan, Iowa. NPDES permit IA0021342, in force until Jun 30, 2029. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (39 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
March 2026Nitrogen, ammonia total [as N], daily maximum33.1≤ 15.7 mg/L111%
March 2026Solids, total suspended, 7-day average52.5≤ 45 mg/L17%
July 2026Nitrogen, ammonia total [as N], daily maximum31≤ 18.7 mg/L66%

Limits in force (83)

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≤ 445 lb/dall year
Solids, total suspended7-day average≤ 667 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≤ 15.4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 7.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 16.3 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 8.3 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 16.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 13.5 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 15.5 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 15.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 8.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 12.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 10.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 17.2 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 16.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 16.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 16.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 227.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 112.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 241 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 123.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 249.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 199.9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 103.8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 230.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 233.1 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 119.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 189.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 159.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 227.9 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 255.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 241 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 276.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 249.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 245.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 227.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 230.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 233.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 258.2 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 245.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 239.3 lb/dMay
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≤ 371 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 593 lb/dall year

How strict are these limits?

Cited limits by parameter: Iowa's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/IA0021342 · MCP: https://passage-data.com/mcp