Airgas USA LLC

NPDES permit OH0123498 · Minor NON-POTW · effective, expires 2030-02-28 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 55 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among OH permits in EPA's filings — check your permit).

Limits in force (32)

OutfallParameterStatisticLimitMonths
002Nitrite + Nitrate total [as N]MO AVG report only all year
002Nitrite + Nitrate total [as N]DAILY MX report only all year
002Aluminum, total recoverableMO AVG report only all year
002Aluminum, total recoverableDAILY MX 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
003pHDAILY MN >= 6.5 SU all year
003pHDAILY MX <= 9 SU all year
003Oil and grease, hexane extr methodDAILY MX <= 7.5 mg/L Mar, Jun, Sep, Dec
003Oil and grease, hexane extr methodDAILY MX <= 1.9 kg/d Mar, Jun, Sep, Dec
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Chlorine, total residualDAILY MX <= .019 mg/L all year
004pHDAILY MN >= 6.5 SU all year
004pHDAILY MX <= 9 SU all year
004Oil and grease, hexane extr methodDAILY MX <= 5.8 mg/L Mar, Jun, Sep, Dec
004Oil and grease, hexane extr methodDAILY MX <= .35 kg/d Mar, Jun, Sep, Dec
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Chlorine, total residualDAILY MX <= .019 mg/L all year
005Nitrite + Nitrate total [as N]MO AVG report only all year
005Nitrite + Nitrate total [as N]DAILY MX report only all year
005Aluminum, total recoverableMO AVG report only all year
005Aluminum, total recoverableDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
006Nitrite + Nitrate total [as N]MO AVG report only all year
006Nitrite + Nitrate total [as N]DAILY MX report only all year
006Aluminum, total recoverableMO AVG report only all year
006Aluminum, total recoverableDAILY MX report only all year
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, 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