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City of Hull

Sewage treatment plant, Hull, Iowa. NPDES permit IA0020991, in force until May 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (34 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 12 reports late

Limits in force (78)

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≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 175 lb/dall year
Solids, total suspended7-day average≤ 263 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≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 14.8 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 21.7 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 6.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 21.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 25.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 15.8 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 9.9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 9.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 6.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 10.7 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 22.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 40.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 49.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 22.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 27.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 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
Copper, total [as Cu]30-day average≤ .01755 mg/Lall year
Copper, total [as Cu]daily maximum≤ .02701 mg/Lall year
Copper, total [as Cu]30-day average≤ .1007 lb/dall year
Copper, total [as Cu]daily maximum≤ .1574 lb/dall year
E. coligeometric mean≤ 561 #/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≤ 146 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 234 lb/dall year

New limits from May 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], 30-day average403 mg/Lnew——
Chloride [as Cl], 30-day average2317 lb/dnew——
Chloride [as Cl], daily maximum631 mg/Lnew——
Chloride [as Cl], daily maximum3679 lb/dnew——

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/IA0020991 · MCP: https://passage-data.com/mcp