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MMC Materials Inc, MSU Row

Ready-Mixed Concrete, Canton, Mississippi. NPDES permit MSG110358 expired Nov 30, 2025; its limits still apply. Last 12 months: no values over a limit, 2 of 8 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: outfall 001 form Q quarterly (5 values), outfall 002 form Q quarterly (5 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 10 required values missing, 4 of 6 reports late

Limits in force (10)

Parameter	Statistic	Limit	Months	Outfall
pH	minimum	≥ 6 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	daily maximum	≤ 45 mg/L	all year	001
Oil and grease	daily maximum	≤ 15 mg/L	all year	001
Flow, in conduit or thru treatment plant	quarterly maximum	report only (gal/d)	all year	001
pH	minimum	≥ 6 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	daily maximum	≤ 45 mg/L	all year	002
Oil and grease	daily maximum	≤ 15 mg/L	all year	002
Flow, in conduit or thru treatment plant	quarterly maximum	report only (gal/d)	all year	002

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/MSG110358 · MCP: https://passage-data.com/mcp