Stepan Company

NPDES permit NC0001112 · Major NON-POTW · effective, expires 2030-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
42required values missing, on 6 form(s)
0of 22 forms filed late

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

Reporting

Reports are due about 30 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (17)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MX <= 28 ug/L all year
002Temperature, water deg. centigradeDAILY MX report only all year
002BOD, 5-day, 20 deg. C30DA AVG <= 29.8 lb/d all year
002BOD, 5-day, 20 deg. CDAILY MX <= 75 lb/d all year
002pHDAILY MN >= 6 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspended30DA AVG <= 47.2 lb/d all year
002Solids, total suspendedDAILY MX <= 146.5 lb/d all year
002Nitrogen, total [as N]DAILY MX report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Flow, in conduit or thru treatment plant30DA AVG <= .5 MGD 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