MMC Materials Inc, Pearl Plant

NPDES permit MSG110369 · Minor NON-POTW · effective, expires 2031-07-31 · EPA's file as of 2026-09-28

Check this month's numbers before you file

Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

EPA's file shows no filings for this permit in this window. That is a statement about the file, not about the facility.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MS permits in EPA's filings — check your permit).

Outfall 001, form Q (PROCESS WASTEWATER): files every 3 months; EPA's filings do not show which

How strict are these limits?

Each concentration limit against the same limit in comparable permits. Where it appears more than once, its strictest value.

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 & Grease, daily maximum 15 mg/L — stricter than 26% of 45 other minor industrial and other permits in Mississippi; 60% have the same limit
pH, minimum at least 6 SU — stricter than 0% of 711 other minor industrial and other permits in Mississippi; 99% have the same limit
pH, maximum 9 SU — stricter than 0% of 704 other minor industrial and other permits in Mississippi; 100% have the same limit

Limits in force (5)

Outfall	Parameter	Statistic	Limit	Months
001	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 & Grease	daily maximum	<= 15 mg/L	all year
001	Flow, in conduit or thru treatment plant	QB	report only	all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states