MATHESON TRI-GAS, INC

NPDES permit NE0113921 · Minor NON-POTW · effective, expires 2028-12-31 · 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

2values over a limit
0required values missing, on 0 form(s)
0of 15 forms filed late

Last period with anything received: 2026-06-30. Most often over: Chlorine, total residual (2).

Reporting

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

Limits in force (16)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX <= 90 deg F all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Chloride [as Cl]MO AVG report only all year
001Chloride [as Cl]DAILY MX report only all year
001Zinc, dissolved [as Zn]MO AVG report only all year
001Zinc, dissolved [as Zn]DAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= .023 mg/L Mar, Apr, May
001Chlorine, total residualMO AVG <= .021 mg/L Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualMO AVG <= .024 mg/L Jan, Feb, Nov, Dec
001Chlorine, total residualDAILY MX <= .046 mg/L Mar, Apr, May
001Chlorine, total residualDAILY MX <= .042 mg/L Jun, Jul, Aug, Sep, Oct
001Chlorine, total residualDAILY MX <= .049 mg/L Jan, Feb, Nov, Dec

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