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Ameren Missouri

Electric Services, Lake Ozark, Missouri. NPDES permit MO0004821, in force until Jun 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form Q quarterly (8 values)
Renewal application due: Jan 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 4 reports late

Limits in force (8)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily maximum	≤ 100 mg/L	all year
Solids, total suspended	monthly average	≤ 30 mg/L	all year
Oil and grease [soxhlet extr.] tot.	daily maximum	≤ 15 mg/L	all year
Oil and grease [soxhlet extr.] tot.	monthly average	≤ 10 mg/L	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year

How strict are these limits?

Solids, total suspended, monthly average 30 mg/L — stricter than 27% of 846 other minor industrial and other permits in Missouri; 32% have the same limit

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

Same industry: the 29 Electric Services permits in Missouri.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0004821 · MCP: https://passage-data.com/mcp