LOUISIANA GRINDING STONE LLC

NPDES permit LA0127118 · Minor NON-POTW · effective, expires 2027-02-28 · EPA's file as of 2026-09-26

Keep this permit as a site — opens New site at EPA's facility point (30.314028, -89.779611); you set the radius.

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.

These are the last limits EPA's file holds for this permit, from an earlier version of it (version 0 in EPA's file): its current version carries none yet. Read your permit: a renewal can change them.

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 (read off this permit's own late-day counts in EPA's filings).

Outfall 001, form Q (the intermittent discharge of stone cutting process wastewater): files for periods ending in Mar, Dec

How strict are these limits?

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

Oxygen demand, chem. [high level] [COD], monthly average 200 mg/L — stricter than 12% of 75 other minor industrial and other permits in Louisiana; 88% have the same limit
Oxygen demand, chem. [high level] [COD], daily maximum 300 mg/L — stricter than 3% of 153 other minor industrial and other permits in Louisiana; 39% have the same limit
Oil & Grease, daily maximum 15 mg/L — stricter than 3% of 400 other minor industrial and other permits in Louisiana; 96% have the same limit
Solids, total suspended, monthly average 90 mg/L — stricter than 0% of 484 other minor industrial and other permits in Louisiana; 4% have the same limit
Solids, total suspended, daily maximum 135 mg/L — stricter than 0% of 548 other minor industrial and other permits in Louisiana; 4% have the same limit
pH, instantaneous maximum 9 SU — stricter than 0% of 676 other minor industrial and other permits in Louisiana; 92% have the same limit
pH, instantaneous minimum at least 6 SU — stricter than 0% of 676 other minor industrial and other permits in Louisiana; 98% have the same limit

Limits in force (9)

Outfall	Parameter	Statistic	Limit	Months
001	Oxygen demand, chem. [high level] [COD]	monthly average	<= 200 mg/L	all year
001	Oxygen demand, chem. [high level] [COD]	daily maximum	<= 300 mg/L	all year
001	pH	instantaneous minimum	>= 6 SU	all year
001	pH	instantaneous maximum	<= 9 SU	all year
001	Solids, total suspended	monthly average	<= 90 mg/L	all year
001	Solids, total suspended	daily maximum	<= 135 mg/L	all year
001	Oil & Grease	daily maximum	<= 15 mg/L	all year
001	Flow, in conduit or thru treatment plant	monthly average	report only	all year
001	Flow, in conduit or thru treatment plant	daily maximum	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