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UNION ELECTRIC COMPANY dba AMEREN MISSOURI

Electric Services, Keokuk, Iowa. NPDES permit IA0033600, in force until Jul 31, 2027. Last 12 months: over a limit 2 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 012 form A monthly (6 values), outfall 027 form A monthly (6 values), outfall 035 form A monthly (11 values)
Renewal application due
Feb 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingOutfallParameterReportedLimitOver by
November 2025027Oil & Grease, 30-day average15.8≤ 15 mg/L5%
July 2026035Solids, total suspended, 7-day average53≤ 45 mg/L18%

Limits in force (23)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6 SUall year012
pHdaily maximum≤ 9 SUall year012
Solids, total suspended30-day average≤ 30 mg/Lall year012
Solids, total suspended7-day average≤ 45 mg/Lall year012
Oil & Grease30-day average≤ 10 mg/Lall year012
Oil & Greasedaily maximum≤ 15 mg/Lall year012
pHdaily minimum≥ 6 SUall year027
pHdaily maximum≤ 9 SUall year027
Solids, total suspended30-day average≤ 30 mg/Lall year027
Solids, total suspended7-day average≤ 45 mg/Lall year027
Oil & Grease30-day average≤ 15 mg/Lall year027
Oil & Greasedaily maximum≤ 20 mg/Lall year027
pHdaily minimum≥ 6 SUall year035
pHdaily maximum≤ 9 SUall year035
Solids, total suspended30-day average≤ 30 mg/Lall year035
Solids, total suspended7-day average≤ 45 mg/Lall year035
Solids, total suspended30-day average≤ .25 lb/dall year035
Solids, total suspended7-day average≤ .38 lb/dall year035
E. coligeometric mean≤ 126 #/100mLMar–Nov035
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year035
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year035
BOD, carbonaceous [5 day, 20 C]30-day average≤ .21 lb/dall year035
BOD, carbonaceous [5 day, 20 C]7-day average≤ .33 lb/dall year035

How strict are these limits?

Cited limits by parameter: Iowa's rules and the federal ones.

Same industry: the 14 Electric Services permits in Iowa.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0033600 · MCP: https://passage-data.com/mcp