SOUTHWEST SHIPYARD LP

NPDES permit TX0092282 · Minor NON-POTW · effective, expires 2026-09-30 · 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

7values over a limit
0required values missing, on 0 form(s)
5of 61 forms filed late

Last period with anything received: 2026-07-31. Most often over: Acetophenone (3), Enterococci (2), Cyanide, free available (1).

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 (243)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MO MIN >= 4 mg/L all year
001Oxygen demand, chem. [high level] [COD]DAILY AV report only all year
001Oxygen demand, chem. [high level] [COD]DAILY MX report only all year
001Oxygen demand, chem. [high level] [COD]DAILY AV <= 190 lb/d all year
001Oxygen demand, chem. [high level] [COD]DAILY MX <= 280 lb/d all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY AV <= 26 mg/L all year
001Solids, total suspendedDAILY MX <= 58 mg/L all year
001Solids, total suspendedDAILY AV <= 29 lb/d all year
001Solids, total suspendedDAILY MX <= 64.7 lb/d all year
001Oil & GreaseDAILY AV <= 10 mg/L all year
001Oil & GreaseDAILY MX <= 20 mg/L all year
001Oil & GreaseDAILY AV <= 18 lb/d all year
001Oil & GreaseDAILY MX <= 39.5 lb/d all year
001Nitrogen, ammonia total [as N]DAILY AV <= 3 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 6 mg/L all year
001Nitrogen, ammonia total [as N]DAILY AV <= 5 lb/d all year
001Nitrogen, ammonia total [as N]DAILY MX <= 10 lb/d all year
001Sulfide, total [as S]DAILY MX report only all year
001Sulfide, total [as S]DAILY MX report only all year
001Arsenic, total [as As]DAILY AV <= .1 mg/L all year
001Arsenic, total [as As]DAILY MX <= .3 mg/L all year
001Arsenic, total [as As]DAILY AV <= .167 lb/d all year
001Arsenic, total [as As]DAILY MX <= .501 lb/d all year
001Cadmium, total [as Cd]DAILY AV <= .01 mg/L all year
001Cadmium, total [as Cd]DAILY MX <= .0172 mg/L all year
001Cadmium, total [as Cd]DAILY AV <= .0134 lb/d all year
001Cadmium, total [as Cd]DAILY MX <= .017 lb/d all year
001Chromium, hexavalent [as Cr]DAILY AV report only all year
001Chromium, hexavalent [as Cr]DAILY MX report only all year
001Chromium, total [as Cr]DAILY AV <= .323 mg/L all year
001Chromium, total [as Cr]DAILY MX <= .42 mg/L all year
001Chromium, total [as Cr]DAILY MX <= .371 lb/d all year
001Cobalt, total [as Co]DAILY AV <= 18.8 mg/L all year
001Cobalt, total [as Co]DAILY MX <= 56.4 mg/L all year
001Cobalt, total [as Co]DAILY AV <= 24.8 lb/d all year
001Cobalt, total [as Co]DAILY MX <= 74.4 lb/d all year
001Copper, total [as Cu]DAILY AV <= .0433 mg/L all year
001Copper, total [as Cu]DAILY MX <= .091 mg/L all year
001Copper, total [as Cu]DAILY AV <= .0723 lb/d all year
001Copper, total [as Cu]DAILY MX <= .151 lb/d all year
001Lead, total [as Pb]DAILY MX <= .14 mg/L all year
001Lead, total [as Pb]DAILY MX <= .123 lb/d all year
001Nickel, total [as Ni]DAILY AV <= .146 mg/L all year
001Nickel, total [as Ni]DAILY MX <= .31 mg/L all year
001Nickel, total [as Ni]DAILY AV <= .244 lb/d all year
001Nickel, total [as Ni]DAILY MX <= .513 lb/d all year
001Zinc, total [as Zn]DAILY AV <= .25 mg/L all year
001Zinc, total [as Zn]DAILY MX <= .497 mg/L all year
001Zinc, total [as Zn]DAILY AV <= .417 lb/d all year
001Zinc, total [as Zn]DAILY MX <= .655 lb/d all year
001Tin, total [as Sn]DAILY AV <= .165 mg/L all year
001Tin, total [as Sn]DAILY MX <= .335 mg/L all year
001Tin, total [as Sn]DAILY AV <= .218 lb/d all year
001Tin, total [as Sn]DAILY MX <= .442 lb/d all year
001Total phenolsDAILY MX <= .35 mg/L all year
001Polynuclear Aromatic Hydrocarbons [PAHs]DAILY AV <= .01 mg/L all year
001Polynuclear Aromatic Hydrocarbons [PAHs]DAILY MX <= .01 mg/L all year
001Polynuclear Aromatic Hydrocarbons [PAHs]DAILY AV <= .016 lb/d all year
001Polynuclear Aromatic Hydrocarbons [PAHs]DAILY MX <= .016 lb/d all year
001Benzene, ethylbenzene, toluene, xylene combinationDAILY AV <= .1 mg/L all year
001Benzene, ethylbenzene, toluene, xylene combinationDAILY MX <= .1 mg/L all year
001Benzene, ethylbenzene, toluene, xylene combinationDAILY AV <= .166 lb/d all year
001Benzene, ethylbenzene, toluene, xylene combinationDAILY MX <= .166 lb/d all year
001BenzeneDAILY MX <= .13 mg/L all year
001Butyl benzyl phthalateDAILY AV <= .089 mg/L all year
001Butyl benzyl phthalateDAILY MX <= .188 mg/L all year
001Butyl benzyl phthalateDAILY AV <= .117 lb/d all year
001Butyl benzyl phthalateDAILY MX <= .248 lb/d all year
001FluorantheneDAILY AV <= .0268 mg/L all year
001FluorantheneDAILY MX <= .0537 mg/L all year
001FluorantheneDAILY AV <= .0353 lb/d all year
001FluorantheneDAILY MX <= .0708 lb/d all year
001PhenanthreneDAILY AV <= .012 mg/L all year
001PhenanthreneDAILY MX <= .025 mg/L all year
001PhenanthreneDAILY AV <= .02 lb/d all year
001PhenanthreneDAILY MX <= .041 lb/d all year
0012,4,6-TrichlorophenolDAILY AV <= .106 mg/L all year
0012,4,6-TrichlorophenolDAILY MX <= .155 mg/L all year
0012,4,6-TrichlorophenolDAILY AV <= .14 lb/d all year
0012,4,6-TrichlorophenolDAILY MX <= .204 lb/d all year
001NaphthaleneDAILY MX <= .06 mg/L all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY AV <= .101 mg/L all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= .215 mg/L all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY AV <= .133 lb/d all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= .283 lb/d all year
001PhenolsDAILY AV <= 1.08 mg/L all year
001PhenolsDAILY MX <= 3.65 mg/L all year
001PhenolsDAILY AV <= 1.42 lb/d all year
001PhenolsDAILY MX <= 4.81 lb/d all year
001Flow, in conduit or thru treatment plantDAILY AV <= .2 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX <= .3 MGD all year
001Chlorine, total residualMO MIN >= 1 mg/L all year
001Chlorine, total residualMO MAX <= 4 mg/L all year
001Cyanide, free availableDAILY AV <= .00878 mg/L all year
001Cyanide, free availableDAILY MX <= .0185 mg/L all year
001EnterococciDAILY AV <= 35 CFU/100mL all year
001EnterococciDAILY MX <= 104 CFU/100mL all year
001Mercury, total [as Hg]DAILY AV <= .00085 mg/L all year
001Mercury, total [as Hg]DAILY MX <= .0013 mg/L all year
001Mercury, total [as Hg]DAILY AV <= .0014 lb/d all year
001Mercury, total [as Hg]DAILY MX <= .0016 lb/d all year
001PyridineDAILY AV <= .182 mg/L all year
001PyridineDAILY MX <= .37 mg/L all year
001PyridineDAILY AV <= .24 lb/d all year
001PyridineDAILY MX <= .488 lb/d all year
001p-CresolDAILY AV <= .205 mg/L all year
001p-CresolDAILY MX <= .698 mg/L all year
001p-CresolDAILY AV <= .27 lb/d all year
001p-CresolDAILY MX <= .92 lb/d all year
001n-DecaneDAILY AV <= .437 mg/L all year
001n-DecaneDAILY MX <= .948 mg/L all year
001n-DecaneDAILY AV <= .576 lb/d all year
001n-DecaneDAILY MX <= 1.25 lb/d all year
001CarbazoleDAILY AV <= .276 mg/L all year
001CarbazoleDAILY MX <= .598 mg/L all year
001CarbazoleDAILY AV <= .364 lb/d all year
001CarbazoleDAILY MX <= .788 lb/d all year
001n-OctadecaneDAILY AV <= .302 mg/L all year
001n-OctadecaneDAILY MX <= .589 mg/L all year
001n-OctadecaneDAILY AV <= .398 lb/d all year
001n-OctadecaneDAILY MX <= .777 lb/d all year
0012-ButanoneDAILY AV <= 1.85 mg/L all year
0012-ButanoneDAILY MX <= 4.81 mg/L all year
0012-ButanoneDAILY AV <= 2.44 lb/d all year
0012-ButanoneDAILY MX <= 6.34 lb/d all year
001o-Cresol [2-Methylphenol]DAILY AV <= .561 mg/L all year
001o-Cresol [2-Methylphenol]DAILY MX <= 1.92 mg/L all year
001o-Cresol [2-Methylphenol]DAILY AV <= .74 lb/d all year
001o-Cresol [2-Methylphenol]DAILY MX <= 2.53 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 10 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 20 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 16.6 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 33.3 lb/d all year
001AcetoneDAILY AV <= 7.97 mg/L all year
001AcetoneDAILY MX <= 30.2 mg/L all year
001AcetoneDAILY AV <= 10.5 lb/d all year
001AcetoneDAILY MX <= 39.8 lb/d all year
001AcetophenoneDAILY AV <= .0562 mg/L all year
001AcetophenoneDAILY MX <= .114 mg/L all year
001AcetophenoneDAILY AV <= .0741 lb/d all year
001AcetophenoneDAILY MX <= .15 lb/d all year
001Hydrocarbons, petroleumDAILY AV <= 15 mg/L all year
001Hydrocarbons, petroleumDAILY MX <= 15 mg/L all year
001Hydrocarbons, petroleumDAILY AV <= 25 lb/d all year
001Hydrocarbons, petroleumDAILY MX <= 25 lb/d all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedDAILY AV <= 50 mg/L all year
003Solids, total suspendedDAILY MX <= 100 mg/L all year
003Solids, total suspendedDAILY AV report only all year
003Solids, total suspendedDAILY MX report only all year
003Solids, total suspendedDAILY AV report only all year
003Solids, total suspendedDAILY MX report only all year
003Oil & GreaseDAILY MX <= 15 mg/L all year
003Arsenic, total [as As]DAILY AV <= .1 mg/L all year
003Arsenic, total [as As]DAILY MX <= .3 mg/L all year
003Copper, total [as Cu]DAILY AV report only all year
003Copper, total [as Cu]DAILY MX report only all year
003Nickel, total [as Ni]DAILY AV <= .12 mg/L all year
003Nickel, total [as Ni]DAILY MX <= .25 mg/L all year
003Silver, total [as Ag]DAILY AV <= .007 mg/L all year
003Silver, total [as Ag]DAILY MX <= .016 mg/L all year
003Zinc, total [as Zn]DAILY MX report only 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 AV <= 50 mg/L all year
004Solids, total suspendedDAILY MX <= 100 mg/L all year
004Solids, total suspendedDAILY AV report only all year
004Solids, total suspendedDAILY MX report only all year
004Solids, total suspendedDAILY AV report only all year
004Solids, total suspendedDAILY MX report only all year
004Oil & GreaseDAILY MX <= 15 mg/L all year
004Arsenic, total [as As]DAILY AV <= .1 mg/L all year
004Arsenic, total [as As]DAILY MX <= .3 mg/L all year
004Copper, total [as Cu]DAILY AV report only all year
004Copper, total [as Cu]DAILY MX report only all year
004Nickel, total [as Ni]DAILY AV <= .12 mg/L all year
004Nickel, total [as Ni]DAILY MX <= .25 mg/L all year
004Silver, total [as Ag]DAILY AV <= .007 mg/L all year
004Silver, total [as Ag]DAILY MX <= .016 mg/L all year
004Zinc, total [as Zn]DAILY AV <= .25 mg/L all year
004Zinc, total [as Zn]DAILY MX <= .53 mg/L all year
004Selenium, total [as Se]DAILY AV report only all year
004Selenium, total [as Se]DAILY MX report only 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
004Cyanide, free availableDAILY AV <= .0088 mg/L all year
004Cyanide, free availableDAILY MX <= .0185 mg/L all year
005pHMINIMUM >= 6 SU all year
005pHMAXIMUM <= 9 SU all year
005Solids, total suspendedDAILY AV <= 50 mg/L all year
005Solids, total suspendedDAILY MX <= 100 mg/L all year
005Solids, total suspendedDAILY AV report only all year
005Solids, total suspendedDAILY MX report only all year
005Solids, total suspendedDAILY AV report only all year
005Solids, total suspendedDAILY MX report only all year
005Oil & GreaseDAILY MX <= 15 mg/L all year
005Copper, total [as Cu]DAILY AV report only all year
005Copper, total [as Cu]DAILY MX report only all year
005Zinc, total [as Zn]DAILY MX report only all year
005Flow, in conduit or thru treatment plantDAILY AV report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
006Oxygen demand, chem. [high level] [COD]DAILY MX <= 150 mg/L all year
006pHMINIMUM >= 6 SU all year
006pHMAXIMUM <= 9 SU all year
006Solids, total suspendedDAILY MX <= 100 mg/L all year
006Oil & GreaseDAILY MX <= 15 mg/L all year
006Flow, in conduit or thru treatment plantDAILY AV report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
TX1Whole Effluent Toxicity [WET] - M. beryllina7 DA MIN >= 8 % all year
TX1Whole Effluent Toxicity [WET] - M. beryllinaMO AV MN >= 8 % all year
TX1Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN >= 8 % all year
TX1Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)MO AV MN >= 8 % all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)MO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)MO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)MO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidiaMO AV MN report only all year
TXALC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)SINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Menidia menidiaSINGSAMP report only all year

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