Airgas USA, LLC

NPDES permit AR0046663 · Minor NON-POTW · effective, expires 2031-01-31 · EPA's file as of 2026-09-19

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

1values over a limit
0required values missing, on 0 form(s)
8of 36 forms filed late

Last period with anything received: 2026-08-31. Most often over: Oil & Grease (1).

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (26)

OutfallParameterStatisticLimitMonths
002Total production - massMO AVG report only all year
002Total production - massMO AVG report only all year
002Oxygen demand, chem. [low level] [COD]MO AVG <= 100 mg/L all year
002Oxygen demand, chem. [low level] [COD]MO AVG <= 100 mg/L all year
002Oxygen demand, chem. [low level] [COD]DAILY MX <= 150 mg/L all year
002Oxygen demand, chem. [low level] [COD]DAILY MX <= 150 mg/L all year
002Oxygen demand, chem. [low level] [COD]MO AVG <= 59.2 lb/d all year
002Oxygen demand, chem. [low level] [COD]MO AVG <= 59.2 lb/d all year
002Oxygen demand, chem. [low level] [COD]DAILY MX <= 88.8 lb/d all year
002Oxygen demand, chem. [low level] [COD]DAILY MX <= 88.8 lb/d all year
002pHMINIMUM >= 6 SU all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002pHMAXIMUM <= 9 SU all year
002Oil & GreaseMO AVG <= 10 mg/L all year
002Oil & GreaseMO AVG <= 10 mg/L all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Oil & GreaseMO AVG <= 1.9 lb/d all year
002Oil & GreaseMO AVG <= 2.7 lb/d all year
002Oil & GreaseDAILY MX <= 3.7 lb/d all year
002Oil & GreaseDAILY MX <= 5.4 lb/d all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Flow, in conduit or thru treatment plantDAILY MX 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