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City of Manning

Sewage treatment plant, Manning, Iowa. NPDES permit IA0023337, in force until Dec 31, 2028. Last 12 months: over a limit 6 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (26 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
9 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
December 2025BOD, carbonaceous [5 day, 20 C], 30-day average26.8≤ 25 mg/L7%
December 2025BOD, carbonaceous [5 day, 20 C], 7-day average81≤ 40 mg/L103%
December 2025Nitrogen, ammonia total [as N], 30-day average8.7≤ 6.3 mg/L38%
January 2026Nitrogen, ammonia total [as N], 30-day average10.15≤ 8.7 mg/L17%
July 2026Nitrogen, ammonia total [as N], 30-day average3.24≤ 2.5 mg/L30%
August 2026Nitrogen, ammonia total [as N], 30-day average6.825≤ 2.4 mg/L184%

Limits in force (70)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.3 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≤ 100 lb/dall year
Solids, total suspended7-day average≤ 150 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≤ 3.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 8.7 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 8.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 5.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 6.3 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 18.1 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 18.5 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 19.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 17.3 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 20.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 17.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 19.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 8.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 10 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 19.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 5.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 22.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 19.5 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 13.5 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 14.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 6.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 56.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 55.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 56 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 45.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 52.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 53.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 54.2 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 43.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 53.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 56.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 57.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 52.4 lb/dSep
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≤ 83 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 133 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/IA0023337 · MCP: https://passage-data.com/mcp