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City of Earlville

Sewage treatment plant, Earlville, Iowa. NPDES permit IA0042773, in force until Sep 30, 2031. Last 12 months: over a limit 15 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], 30-day average33.32≤ 25 mg/L33%
December 2025Chloride [as Cl], 30-day average507≤ 448 mg/L13%
January 2026BOD, carbonaceous [5 day, 20 C], 30-day average25.25≤ 25 mg/L1%
January 2026BOD, carbonaceous [5 day, 20 C], 7-day average32.36587≤ 28 lb/d16%
January 2026Nitrogen, ammonia total [as N], 30-day average7.0525≤ 5.7 mg/L24%
January 2026Nitrogen, ammonia total [as N], daily maximum25.5≤ 15.5 mg/L65%
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average21.37625≤ 18 lb/d19%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average60.52838≤ 28 lb/d116%
June 2026BOD, carbonaceous [5 day, 20 C], 30-day average24.06486≤ 18 lb/d34%
June 2026BOD, carbonaceous [5 day, 20 C], 7-day average31.76539≤ 28 lb/d13%
June 2026Solids, total suspended, 30-day average29.50692≤ 21 lb/d41%
June 2026Solids, total suspended, 30-day average58≤ 30 mg/L93%
June 2026Solids, total suspended, 7-day average58≤ 45 mg/L29%
July 2026BOD, carbonaceous [5 day, 20 C], 30-day average21.26966≤ 18 lb/d18%
July 2026BOD, carbonaceous [5 day, 20 C], 7-day average38.51578≤ 28 lb/d38%

Limits in force (64)

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≤ 21 lb/dall year
Solids, total suspended7-day average≤ 32 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 6.5 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 5.7 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 5.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 14.5 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 1.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1.1 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 1.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 4.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 1.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 2.7 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 4 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 4 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 11.5 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 10.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 10.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 10.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 10.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 11 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 lb/dSep
Chloride [as Cl]30-day average≤ 448 mg/Lall year
Chloride [as Cl]daily maximum≤ 639 mg/Lall year
Chloride [as Cl]30-day average≤ 317 lb/dall year
Chloride [as Cl]daily maximum≤ 453 lb/dall year
E. coligeometric mean≤ 142 #/100mLMar–Nov
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≤ 18 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 28 lb/dall year

New limits from Sep 1, 2031

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Copper, total [as Cu], 30-day average0.0205 mg/Lnew——
Copper, total [as Cu], 30-day average0.02748 lb/dnew——
Copper, total [as Cu], daily maximum0.01423 mg/Lnew——
Copper, total [as Cu], daily maximum0.01943 lb/dnew——

How strict are these limits?

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

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