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MMC Materials Inc, Meridian Portable Plant

Ready-Mixed Concrete, Meridian, Mississippi. NPDES permit MSG110363 expired Nov 30, 2025; its limits still apply. 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 (5 values)
Last report on file: September 2026

Limits in force (5)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Oil and grease	daily maximum	≤ 15 mg/L	all year
Flow, in conduit or thru treatment plant	maximum	report only (gal/d)	all year

How strict are these limits?

Solids, total suspended, daily maximum 45 mg/L — stricter than 60% of 582 other minor industrial and other permits in Mississippi; 38% have the same limit
Oil and grease, daily maximum 15 mg/L — stricter than 34% of 209 other minor industrial and other permits nationwide; 54% have the same limit

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

Same industry: the 10 Stone, Clay, Glass and Concrete Products 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/MSG110363 · MCP: https://passage-data.com/mcp