STEEL DYNAMICS SOUTHWEST LLC

NPDES permit TX0139629 · Minor NON-POTW · administratively continued, expires 2026-05-26 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2026-05-26 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

10values over a limit
0required values missing, on 0 form(s)
0of 72 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (8), Nitrogen, ammonia total [as N] (2).

Reporting

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

Limits in force (101)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Oxygen, dissolved [DO]MO MIN >= 3 mg/L all year
001Nitrogen, ammonia total [as N]DAILY AV <= 3 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 45 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedDAILY MX <= 100 mg/L all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Carbon, tot organic [TOC]DAILY MX <= 75 mg/L all year
002Flow, in conduit or thru treatment plantDAILY AV report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedDAILY MX <= 100 mg/L all year
003Oil & GreaseDAILY MX <= 15 mg/L all year
003Carbon, tot organic [TOC]DAILY MX <= 75 mg/L all year
003Flow, in conduit or thru treatment plantDAILY AV report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspendedDAILY MX <= 100 mg/L all year
004Oil & GreaseDAILY MX <= 15 mg/L all year
004Carbon, tot organic [TOC]DAILY MX <= 75 mg/L all year
004Flow, in conduit or thru treatment plantDAILY AV report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
101Temperature, water deg. fahrenheitDAILY AV report only all year
101Temperature, water deg. fahrenheitDAILY MX report only all year
101pHMINIMUM >= 5 SU all year
101pHMAXIMUM <= 11 SU all year
101Solids, total suspendedDAILY AV <= 764 lb/d all year
101Solids, total suspendedDAILY MX <= 1885 lb/d all year
101Oil & GreaseDAILY AV <= 173 lb/d all year
101Oil & GreaseDAILY MX <= 617 lb/d all year
101Chromium, total [as Cr]DAILY AV <= 2.823 lb/d all year
101Chromium, total [as Cr]DAILY MX <= 7.042 lb/d all year
101Lead, total [as Pb]DAILY AV <= .386 lb/d all year
101Lead, total [as Pb]DAILY MX <= .815 lb/d all year
101Nickel, total [as Ni]DAILY AV <= 1.94 lb/d all year
101Nickel, total [as Ni]DAILY MX <= 5.77 lb/d all year
101Zinc, total [as Zn]DAILY AV <= 2.4 lb/d all year
101Zinc, total [as Zn]DAILY MX <= 7.04 lb/d all year
101TetrachloroethyleneDAILY MX <= .976 lb/d all year
101NaphthaleneDAILY MX <= .649 lb/d all year
101Flow, in conduit or thru treatment plantDAILY AV <= 1.2 MGD all year
101Flow, in conduit or thru treatment plantDAILY MX <= 3 MGD all year
101pH range excursions, > 60 minutesMO TOTAL <= 0 occur/mo all year
101pH range excursions, monthly total accumMO TOTAL <= 446 min all year
201pHMINIMUM >= 7.5 SU all year
201pHMAXIMUM <= 10 SU all year
201Solids, total suspendedDAILY AV <= 17.52 lb/d all year
201Solids, total suspendedDAILY MX <= 21.97 lb/d all year
201Oil & GreaseDAILY AV <= 14.62 lb/d all year
201Oil & GreaseDAILY MX <= 14.71 lb/d all year
201Cyanide, total [as CN]DAILY AV <= .119 lb/d all year
201Cyanide, total [as CN]DAILY MX <= .256 lb/d all year
201Chromium, total [as Cr]DAILY AV <= .228 lb/d all year
201Chromium, total [as Cr]DAILY MX <= .552 lb/d all year
201Copper, total [as Cu]DAILY AV <= .483 lb/d all year
201Copper, total [as Cu]DAILY MX <= 1.011 lb/d all year
201Iron, total [as Fe]DAILY AV <= .931 lb/d all year
201Iron, total [as Fe]DAILY MX <= 1.903 lb/d all year
201Zinc, total [as Zn]DAILY AV <= .617 lb/d all year
201Zinc, total [as Zn]DAILY MX <= 1.583 lb/d all year
201Flow, in conduit or thru treatment plantDAILY AV report only all year
201Flow, in conduit or thru treatment plantDAILY MX report only all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TXAWhole effluent toxicity - retest #1SINGSAMP report only all year
TXAWhole effluent toxicity - retest #2SINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute D. PulexSINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Pimephales promelasSINGSAMP 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