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City of Jefferson

Sewage treatment plant, major discharger, Jefferson, Iowa. NPDES permit IA0021300, in force until Jul 31, 2031. Last 12 months: over a limit once (last January 2026), 1 of 11 reports late. 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
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimit
January 2026pH, daily minimum5.77≥ 6 SU

Limits in force (86)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 1.4 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≤ 613 lb/dall year
Solids, total suspended7-day average≤ 919 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≤ 12.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 10.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 6.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 13.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 14.7 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 7.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 8.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 14.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 170.8 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 142.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 87.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 181.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 56.8 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 59 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 66.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 280.3 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 62.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 251.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 102.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 114.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 281.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 285.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 292.7 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 305.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 282 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 278.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 308.5 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 280.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 265.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 295.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 300.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 300.3 lb/dOct
Nitrogen, Kjeldahl, total [as N]30-day average≤ 237 lb/dall year
Nitrogen, Kjeldahl, total [as N]daily maximum≤ 388 lb/dall 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
Copper, total [as Cu]30-day average≤ .031 mg/Lall year
Copper, total [as Cu]daily maximum≤ .031 mg/Lall year
Copper, total [as Cu]30-day average≤ .498 lb/dall year
Copper, total [as Cu]daily maximum≤ .574 lb/dall 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≤ 511 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 817 lb/dall year

How strict are these limits?

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

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