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Clean Water Act discharge permit · NPDES TX0139629

SINTON MILL FACILITY, Sinton, TX: NPDES TX0139629 discharge permit, effluent exceedances, inspections, penalties

SINTON MILL FACILITY, held by STEEL DYNAMICS SOUTHWEST LLC, holds NPDES permit TX0139629, which discharges to Aransas River Tidal. EPA’s file records it issued May 26, 2021 and expiring May 26, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedSINTON MILL FACILITY
Permittee as filedSTEEL DYNAMICS SOUTHWEST LLC
NPDES IDTX0139629
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial pretreatment
IssuedMay 26, 2021
Expiration dateMay 26, 2026
AddressSinton, TX 78387
Receiving waterAransas River Tidal
Other EPA IDs (FRS)RCRA handler TXR000085550

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Solids, total suspended13112112April 30, 20268,560% over the limit
pH148375January 31, 2025
Oil & Grease113535March 31, 202527,298% over the limit
Iron, total [as Fe]43232March 31, 20252,574% over the limit
Zinc, total [as Zn]82929December 31, 2024746% over the limit
Oxygen, dissolved [DO]12314March 31, 202567% over the limit
Nitrogen, ammonia total [as N]266December 31, 2025643% over the limit
Chromium, total [as Cr]855April 30, 2022153% over the limit
pH range excursions, monthly total accum255August 31, 2024175% over the limit
pH range excursions, > 60 minutes222January 31, 20222,147,483,650% over the limit
Flow, in conduit or thru treatment plant16270
Chlorine, total residual190
Temperature, water deg. fahrenheit500
Cyanide, total [as CN]400
Copper, total [as Cu]400
Lead, total [as Pb]400
Nickel, total [as Ni]400
Carbon, tot organic [TOC]300
Whole effluent toxicity - retest #1300
Whole effluent toxicity - retest #2300
BOD, 5-day, 20 deg. C200
Tetrachloroethylene200
Naphthalene200
E. coli200
BOD, carbonaceous [5 day, 20 C]200
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia200
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas200
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia200
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas200
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia200
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas200
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia200
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas200
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia200
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas200
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia200
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas200
LC50 Pass/Fail Static 24Hr Acute D. Pulex100
LC50 Pass/Fail Static 24Hr Acute Pimephales promelas100

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

DateWhat EPA recordedAgency
November 1, 2023Permit Violations - Violation Specified in CommentST6

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID TX0139629 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

The page covers NPDES permit TX0139629 for the SINTON MILL FACILITY in Sinton, TX, held by STEEL DYNAMICS SOUTHWEST LLC, which discharges to Aransas River Tidal and is administratively continued. The figures listed are 39 discharger class, 10 pollutants under a numeric limit, and 10 pollutants with an effluent exceedance.