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City of Sully

Sewage treatment plant, Sully, Iowa. NPDES permit IA0041963, in force until Dec 31, 2030. Last 12 months: over a limit 2 times (last August 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (30 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 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
August 2026Solids, total suspended, 30-day average35.5≤ 30 mg/L18%
August 2026Solids, total suspended, 7-day average62≤ 45 mg/L38%

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≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 248 lb/dall year
Solids, total suspended7-day average≤ 372 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≤ 3.4 mg/LMar
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≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 7.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 5.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 10.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 28.1 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 28.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 12.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 19.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 32.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 10.8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 7.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 20.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 8.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 12.6 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 14.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 8.7 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 121.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 125.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 76 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 117.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 61.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 46.2 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 47.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 92 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 84.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 56.1 lb/dSep
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .1393 lb/dall year
Copper, total [as Cu]daily maximum≤ .2221 lb/dall year
E. coligeometric mean≤ 198 #/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≤ 207 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 330 lb/dall year

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/IA0041963 · MCP: https://passage-data.com/mcp