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City of Cincinnati

Sewage treatment plant, Cincinnati, Iowa. NPDES permit IA0070734, in force until Mar 31, 2030. Last 12 months: over a limit 18 times (last August 2026), 31 required values missing, 4 of 11 reports late. 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
52 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 18 values over a limit
Period endingParameterReportedLimitOver by
October 2025pH, daily maximum9.79≤ 9 SU—
November 2025pH, daily maximum9.86≤ 9 SU—
January 2026Nitrogen, ammonia total [as N], 30-day average11.26317≤ 1.7 lb/d563%
January 2026Nitrogen, ammonia total [as N], 30-day average3.65≤ 3.4 mg/L7%
January 2026Nitrogen, ammonia total [as N], daily maximum14.6≤ 12.1 mg/L21%
January 2026Nitrogen, ammonia total [as N], daily maximum45.05268≤ 6.2 lb/d627%
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average26.8548≤ 20 lb/d34%
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average15.39564≤ 13 lb/d18%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average32.109≤ 20 lb/d61%
May 2026BOD, carbonaceous [5 day, 20 C], 30-day average13.94865≤ 13 lb/d7%
May 2026BOD, carbonaceous [5 day, 20 C], 7-day average30.441≤ 20 lb/d52%
July 2026BOD, carbonaceous [5 day, 20 C], 7-day average58.38≤ 20 lb/d192%
July 2026BOD, carbonaceous [5 day, 20 C], 7-day average70≤ 40 mg/L75%
July 2026Solids, total suspended, 30-day average16.0128≤ 15 lb/d7%
August 2026BOD, carbonaceous [5 day, 20 C], 30-day average37.05045≤ 13 lb/d185%
August 2026BOD, carbonaceous [5 day, 20 C], 7-day average41≤ 40 mg/L3%
August 2026BOD, carbonaceous [5 day, 20 C], 7-day average80.064≤ 20 lb/d300%
August 2026Solids, total suspended, 30-day average16.0128≤ 15 lb/d7%

Limits in force (70)

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 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≤ 15 lb/dall year
Solids, total suspended7-day average≤ 23 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≤ 1.3 mg/LJun
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]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
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]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 14.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ .7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ .8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ .9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ .8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ .5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 4.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 5.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 lb/dJul
E. coligeometric mean≤ 176 #/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≤ 13 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 20 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/IA0070734 · MCP: https://passage-data.com/mcp