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Southern Natural Gas Co LLC, Louisville Compressor Station

Natural Gas Transmission, Louisville, Mississippi. NPDES permit MS0051021, in force until Jul 31, 2029. 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 (10 values)
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 (10)

Parameter	Statistic	Limit	Months
BOD, 5-day, 20 deg. C	quarterly average	report only (mg/L)	all year
BOD, 5-day, 20 deg. C	quarterly maximum	report only (mg/L)	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	quarterly average	≤ 30 mg/L	all year
Solids, total suspended	quarterly maximum	≤ 45 mg/L	all year
Oil & Grease	quarterly average	≤ 10 mg/L	all year
Oil & Grease	quarterly maximum	≤ 15 mg/L	all year
Flow, in conduit or thru treatment plant	quarterly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	quarterly maximum	report only (MGD)	all year

How strict are these limits?

Solids, total suspended, quarterly average 30 mg/L — stricter than 29% of 74 other minor industrial and other permits nationwide; 41% have the same limit
Solids, total suspended, quarterly maximum 45 mg/L — stricter than 20% of 20 other minor industrial and other permits nationwide; 50% have the same limit

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

Same industry: the 9 Natural Gas Transmission permits in Mississippi.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0051021 · MCP: https://passage-data.com/mcp