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City of Allerton

Sewage treatment plant, Allerton, Iowa. NPDES permit IA0054046 expired Aug 31, 2026; its limits still apply. Last 12 months: over a limit 9 times (last July 2026), 6 required values missing, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (30 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025pH, daily maximum9.1≤ 9 SU—
February 2026Nitrogen, ammonia total [as N], 30-day average6.54875≤ 4 mg/L64%
February 2026Nitrogen, ammonia total [as N], daily maximum8.79≤ 8.4 mg/L5%
March 2026Nitrogen, ammonia total [as N], 30-day average6.94375≤ 3.4 mg/L104%
March 2026Nitrogen, ammonia total [as N], daily maximum9.07≤ 3.9 mg/L133%
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average26.66666≤ 25 mg/L7%
May 2026Nitrogen, ammonia total [as N], 30-day average2.63≤ 1.7 mg/L55%
May 2026Nitrogen, ammonia total [as N], daily maximum19.5≤ 3.2 mg/L509%
July 2026E. coli, geometric mean2802.17≤ 630 #/100mL345%

Limits in force (74)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 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≥ 6.5 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≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 140 lb/dall year
Solids, total suspended7-day average≤ 210 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, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 2.3 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 6.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 4.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 2.7 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 4.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 8.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 32.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 lb/dMar
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
E. coligeometric mean≤ 630 #/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≤ 44 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 70 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/IA0054046 · MCP: https://passage-data.com/mcp