GERDAU MACSTEEL INC

NPDES permit MS0000931 · Major NON-POTW · effective, expires 2030-07-31 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

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

Reporting

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

Limits in force (45)

OutfallParameterStatisticLimitMonths
003Oxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
003BOD, 5-day, 20 deg. CMO AVG report only all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003BOD, 5-day, 20 deg. CMO AVG report only all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003TolueneMO AVG report only all year
003TolueneDAILY MX report only all year
003TolueneMO AVG report only all year
003TolueneDAILY MX report only all year
003ChlorobenzeneMO AVG report only all year
003ChlorobenzeneDAILY MX report only all year
003ChlorobenzeneMO AVG report only all year
003ChlorobenzeneDAILY MX report only all year
0031,1-DichloroethyleneMO AVG report only all year
0031,1-DichloroethyleneDAILY MX report only all year
0031,1-DichloroethyleneMO AVG report only all year
0031,1-DichloroethyleneDAILY MX report only all year
003trans-1,2-DichloroethyleneMO AVG report only all year
003trans-1,2-DichloroethyleneDAILY MX report only all year
003trans-1,2-DichloroethyleneMO AVG report only all year
003trans-1,2-DichloroethyleneDAILY MX report only all year
003Vinyl chlorideMO AVG report only all year
003Vinyl chlorideDAILY MX report only all year
003Vinyl chlorideMO AVG report only all year
003Vinyl chlorideDAILY MX report only all year
003TrichloroethyleneMO AVG report only all year
003TrichloroethyleneDAILY MX report only all year
003TrichloroethyleneMO AVG report only all year
003TrichloroethyleneDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG <= .018 MGD all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Ammonia [as N] + unionized ammoniaMO AVG report only all year
003Ammonia [as N] + unionized ammoniaDAILY MX report only all year
003Ammonia [as N] + unionized ammoniaMO AVG report only all year
003Ammonia [as N] + unionized ammoniaDAILY MX report only all year
003Suspended solids, total annualMO AVG report only all year
003Suspended solids, total annualDAILY MX report only all year
003Suspended solids, total annualMO AVG report only all year
003Suspended solids, total annualDAILY MX report only all year
003TetrachloroethyleneMO AVG <= .254 mg/L all year
003TetrachloroethyleneDAILY MX <= .381 mg/L all year
003TetrachloroethyleneMO AVG <= .04 lb/d all year
003TetrachloroethyleneDAILY MX <= .06 lb/d 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