DIAMOND SHAMROCK REFINING COMPANY, LP

NPDES permit TX0088331 · Major NON-POTW · administratively continued, expires 2025-11-20 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2025-11-20 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

0values over a limit
0required values missing, on 0 form(s)
3of 28 forms filed late

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

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (67)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO MIN >= 4 mg/L all year
001Oxygen demand, chem. [high level] [COD]DAILY AV <= 4605 lb/d all year
001Oxygen demand, chem. [high level] [COD]DAILY MX <= 8967 lb/d all year
001pHMINIMUM >= 5 SU all year
001pHMAXIMUM <= 11 SU all year
001Solids, total suspendedDAILY AV <= 684 lb/d all year
001Solids, total suspendedDAILY MX <= 1137 lb/d all year
001Oil & GreaseDAILY AV <= 255 lb/d all year
001Oil & GreaseDAILY MX <= 456 lb/d all year
001Nitrogen, ammonia total [as N]DAILY AV <= 16 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 32 mg/L all year
001Nitrogen, ammonia total [as N]DAILY AV <= 200 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 400 lb/d all year
001Sulfide, total [as S]DAILY AV <= 3.8 lb/d all year
001Sulfide, total [as S]DAILY MX <= 8.4 lb/d all year
001Chloride [as Cl]DAILY AV <= 20041 lb/d all year
001Chloride [as Cl]DAILY MX <= 42397 lb/d all year
001Chromium, hexavalent [as Cr]DAILY AV <= .169 lb/d all year
001Chromium, hexavalent [as Cr]DAILY MX <= .35 lb/d all year
001Chromium, total [as Cr]DAILY AV <= 9.9 lb/d all year
001Chromium, total [as Cr]DAILY MX <= 23.7 lb/d all year
001Selenium, total [as Se]DAILY AV report only all year
001Selenium, total [as Se]DAILY MX report only all year
001PhenolsDAILY AV <= 4.1 lb/d all year
001PhenolsDAILY MX <= 8.5 lb/d all year
001Flow, in conduit or thru treatment plantDAILY AV <= 1.5 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX <= 3 MGD all year
001Solids, total dissolvedDAILY AV <= 3562 mg/L all year
001Solids, total dissolvedDAILY MX <= 5600 mg/L all year
001Solids, total dissolvedDAILY AV <= 23400 lb/d all year
001Solids, total dissolvedDAILY MX <= 56074 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 47 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 94 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 588 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 1177 lb/d all year
001pH range excursions, > 60 minutesMO TOTAL <= 0 occur/mo all year
001pH range excursions, monthly total accumMO TOTAL <= 446 min all year
002Oxygen demand, chem. [high level] [COD]DAILY MX <= 150 mg/L all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Oil & GreaseDAILY MX <= 15 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
TX1Whole effluent toxicity48HR MIN >= 27 % all year
TX1Whole effluent toxicityMO AV MN >= 27 % all year
TX1Whole effluent toxicity48HR MIN >= 27 % all year
TX1Whole effluent toxicityMO AV MN >= 27 % all year
TX1Whole effluent toxicity - retest #148HR MIN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #248HR MIN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
TX1Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexMO AV MN report only all year
TX1LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX1LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasMO AV MN report only all year
TX1NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48HR MIN report only all year
TX1NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexMO AV MN report only all year
TX1NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48HR MIN report only all year
TX1NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasMO AV MN report only all year
TX1LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex48HR MIN report only all year
TX1LOAEC Lethal Static Renewal 48HR Acute Daphnia pulexMO AV MN report only all year
TX1LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX1LOAEC Lethal Survival Static Renewal 48Hr Acute 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