United States Gypsum Co.

NPDES permit OK0038806 · 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

1values over a limit
0required values missing, on 0 form(s)
0of 12 forms filed late

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

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (11)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Nitrogen, nitrate total [as N]MO AVG <= 10.63 mg/L all year
001Nitrogen, nitrate total [as N]DAILY MX <= 18.42 mg/L all year
001Nitrogen, nitrate total [as N]MO AVG <= 12.5 lb/d all year
001Nitrogen, nitrate total [as N]DAILY MX <= 21.7 lb/d all year
001Sulfate, total [as SO4]MO AVG <= 2946 mg/L all year
001Sulfate, total [as SO4]DAILY MX <= 2975 mg/L 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

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