Southwest Shipyard LP — NPDES permit TX0092282: limits, due date and EPA's record

Ship Building And Repairing, Channelview, Texas. NPDES permit TX0092282 expired Sep 30, 2026; its limits still apply. Last 12 months: over a limit 7 times (last June 2026), 2 required values missing, 5 of 60 reports late. Source: EPA ECHO, Oct 22, 2026.

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
March 2026	Acetophenone, daily average	.08001 lb/d	≤ .0741 lb/d	8%
March 2026	Acetophenone, daily average	.204 mg/L	≤ .0562 mg/L	263%
March 2026	Acetophenone, daily maximum	.204 mg/L	≤ .114 mg/L	79%
March 2026	BOD, carbonaceous [5 day, 20 C], daily maximum	26.7 mg/L	≤ 20 mg/L	34%
April 2026	Cyanide, free available, daily maximum	.0203 mg/L	≤ .0185 mg/L	10%
June 2026	Enterococci, daily average	100.5 CFU/100mL	≤ 35 CFU/100mL	187%
June 2026	Enterococci, daily maximum	201 CFU/100mL	≤ 104 CFU/100mL	93%

Limits in force (243)

Parameter	Statistic	Limit	Months	Outfall
Oxygen, dissolved [DO]	monthly minimum	≥ 4 mg/L	all year	001
Oxygen demand, chem. [high level] [COD]	daily average	report only (mg/L)	all year	001
Oxygen demand, chem. [high level] [COD]	daily maximum	report only (mg/L)	all year	001
Oxygen demand, chem. [high level] [COD]	daily average	≤ 190 lb/d	all year	001
Oxygen demand, chem. [high level] [COD]	daily maximum	≤ 280 lb/d	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	daily average	≤ 26 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 58 mg/L	all year	001
Solids, total suspended	daily average	≤ 29 lb/d	all year	001
Solids, total suspended	daily maximum	≤ 64.7 lb/d	all year	001
Oil & Grease	daily average	≤ 10 mg/L	all year	001
Oil & Grease	daily maximum	≤ 20 mg/L	all year	001
Oil & Grease	daily average	≤ 18 lb/d	all year	001
Oil & Grease	daily maximum	≤ 39.5 lb/d	all year	001
Nitrogen, ammonia total [as N]	daily average	≤ 3 mg/L	all year	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 6 mg/L	all year	001
Nitrogen, ammonia total [as N]	daily average	≤ 5 lb/d	all year	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10 lb/d	all year	001
Sulfide, total [as S]	daily maximum	report only (mg/L)	all year	001
Sulfide, total [as S]	daily maximum	report only (lb/d)	all year	001
Arsenic, total [as As]	daily average	≤ .1 mg/L	all year	001
Arsenic, total [as As]	daily maximum	≤ .3 mg/L	all year	001
Arsenic, total [as As]	daily average	≤ .167 lb/d	all year	001
Arsenic, total [as As]	daily maximum	≤ .501 lb/d	all year	001
Cadmium, total [as Cd]	daily average	≤ .01 mg/L	all year	001
Cadmium, total [as Cd]	daily maximum	≤ .0172 mg/L	all year	001
Cadmium, total [as Cd]	daily average	≤ .0134 lb/d	all year	001
Cadmium, total [as Cd]	daily maximum	≤ .017 lb/d	all year	001
Chromium, hexavalent [as Cr]	daily average	report only (mg/L)	all year	001
Chromium, hexavalent [as Cr]	daily maximum	report only (mg/L)	all year	001
Chromium, total [as Cr]	daily average	≤ .323 mg/L	all year	001
Chromium, total [as Cr]	daily maximum	≤ .42 mg/L	all year	001
Chromium, total [as Cr]	daily maximum	≤ .371 lb/d	all year	001
Cobalt, total [as Co]	daily average	≤ 18.8 mg/L	all year	001
Cobalt, total [as Co]	daily maximum	≤ 56.4 mg/L	all year	001
Cobalt, total [as Co]	daily average	≤ 24.8 lb/d	all year	001
Cobalt, total [as Co]	daily maximum	≤ 74.4 lb/d	all year	001
Copper, total [as Cu]	daily average	≤ .0433 mg/L	all year	001
Copper, total [as Cu]	daily maximum	≤ .091 mg/L	all year	001
Copper, total [as Cu]	daily average	≤ .0723 lb/d	all year	001
Copper, total [as Cu]	daily maximum	≤ .151 lb/d	all year	001
Lead, total [as Pb]	daily maximum	≤ .14 mg/L	all year	001
Lead, total [as Pb]	daily maximum	≤ .123 lb/d	all year	001
Nickel, total [as Ni]	daily average	≤ .146 mg/L	all year	001
Nickel, total [as Ni]	daily maximum	≤ .31 mg/L	all year	001
Nickel, total [as Ni]	daily average	≤ .244 lb/d	all year	001
Nickel, total [as Ni]	daily maximum	≤ .513 lb/d	all year	001
Zinc, total [as Zn]	daily average	≤ .25 mg/L	all year	001
Zinc, total [as Zn]	daily maximum	≤ .497 mg/L	all year	001
Zinc, total [as Zn]	daily average	≤ .417 lb/d	all year	001
Zinc, total [as Zn]	daily maximum	≤ .655 lb/d	all year	001
Tin, total [as Sn]	daily average	≤ .165 mg/L	all year	001
Tin, total [as Sn]	daily maximum	≤ .335 mg/L	all year	001
Tin, total [as Sn]	daily average	≤ .218 lb/d	all year	001
Tin, total [as Sn]	daily maximum	≤ .442 lb/d	all year	001
Total phenols	daily maximum	≤ .35 mg/L	all year	001
Polynuclear Aromatic Hydrocarbons [PAHs]	daily average	≤ .01 mg/L	all year	001
Polynuclear Aromatic Hydrocarbons [PAHs]	daily maximum	≤ .01 mg/L	all year	001
Polynuclear Aromatic Hydrocarbons [PAHs]	daily average	≤ .016 lb/d	all year	001
Polynuclear Aromatic Hydrocarbons [PAHs]	daily maximum	≤ .016 lb/d	all year	001
Benzene, ethylbenzene, toluene, xylene combination	daily average	≤ .1 mg/L	all year	001
Benzene, ethylbenzene, toluene, xylene combination	daily maximum	≤ .1 mg/L	all year	001
Benzene, ethylbenzene, toluene, xylene combination	daily average	≤ .166 lb/d	all year	001
Benzene, ethylbenzene, toluene, xylene combination	daily maximum	≤ .166 lb/d	all year	001
Benzene	daily maximum	≤ .13 mg/L	all year	001
Butyl benzyl phthalate	daily average	≤ .089 mg/L	all year	001
Butyl benzyl phthalate	daily maximum	≤ .188 mg/L	all year	001
Butyl benzyl phthalate	daily average	≤ .117 lb/d	all year	001
Butyl benzyl phthalate	daily maximum	≤ .248 lb/d	all year	001
Fluoranthene	daily average	≤ .0268 mg/L	all year	001
Fluoranthene	daily maximum	≤ .0537 mg/L	all year	001
Fluoranthene	daily average	≤ .0353 lb/d	all year	001
Fluoranthene	daily maximum	≤ .0708 lb/d	all year	001
Phenanthrene	daily average	≤ .012 mg/L	all year	001
Phenanthrene	daily maximum	≤ .025 mg/L	all year	001
Phenanthrene	daily average	≤ .02 lb/d	all year	001
Phenanthrene	daily maximum	≤ .041 lb/d	all year	001
2,4,6-Trichlorophenol	daily average	≤ .106 mg/L	all year	001
2,4,6-Trichlorophenol	daily maximum	≤ .155 mg/L	all year	001
2,4,6-Trichlorophenol	daily average	≤ .14 lb/d	all year	001
2,4,6-Trichlorophenol	daily maximum	≤ .204 lb/d	all year	001
Naphthalene	daily maximum	≤ .06 mg/L	all year	001
Di[2-ethylhexyl] phthalate [DEHP]	daily average	≤ .101 mg/L	all year	001
Di[2-ethylhexyl] phthalate [DEHP]	daily maximum	≤ .215 mg/L	all year	001
Di[2-ethylhexyl] phthalate [DEHP]	daily average	≤ .133 lb/d	all year	001
Di[2-ethylhexyl] phthalate [DEHP]	daily maximum	≤ .283 lb/d	all year	001
Phenols	daily average	≤ 1.08 mg/L	all year	001
Phenols	daily maximum	≤ 3.65 mg/L	all year	001
Phenols	daily average	≤ 1.42 lb/d	all year	001
Phenols	daily maximum	≤ 4.81 lb/d	all year	001
Flow, in conduit or thru treatment plant	daily average	≤ .2 MGD	all year	001
Flow, in conduit or thru treatment plant	daily maximum	≤ .3 MGD	all year	001
Chlorine, total residual	monthly minimum	≥ 1 mg/L	all year	001
Chlorine, total residual	monthly maximum	≤ 4 mg/L	all year	001
Cyanide, free available	daily average	≤ .00878 mg/L	all year	001
Cyanide, free available	daily maximum	≤ .0185 mg/L	all year	001
Enterococci	daily average	≤ 35 CFU/100mL	all year	001
Enterococci	daily maximum	≤ 104 CFU/100mL	all year	001
Mercury, total [as Hg]	daily average	≤ .00085 mg/L	all year	001
Mercury, total [as Hg]	daily maximum	≤ .0013 mg/L	all year	001
Mercury, total [as Hg]	daily average	≤ .0014 lb/d	all year	001
Mercury, total [as Hg]	daily maximum	≤ .0016 lb/d	all year	001
Pyridine	daily average	≤ .182 mg/L	all year	001
Pyridine	daily maximum	≤ .37 mg/L	all year	001
Pyridine	daily average	≤ .24 lb/d	all year	001
Pyridine	daily maximum	≤ .488 lb/d	all year	001
p-Cresol	daily average	≤ .205 mg/L	all year	001
p-Cresol	daily maximum	≤ .698 mg/L	all year	001
p-Cresol	daily average	≤ .27 lb/d	all year	001
p-Cresol	daily maximum	≤ .92 lb/d	all year	001
n-Decane	daily average	≤ .437 mg/L	all year	001
n-Decane	daily maximum	≤ .948 mg/L	all year	001
n-Decane	daily average	≤ .576 lb/d	all year	001
n-Decane	daily maximum	≤ 1.25 lb/d	all year	001
Carbazole	daily average	≤ .276 mg/L	all year	001
Carbazole	daily maximum	≤ .598 mg/L	all year	001
Carbazole	daily average	≤ .364 lb/d	all year	001
Carbazole	daily maximum	≤ .788 lb/d	all year	001
n-Octadecane	daily average	≤ .302 mg/L	all year	001
n-Octadecane	daily maximum	≤ .589 mg/L	all year	001
n-Octadecane	daily average	≤ .398 lb/d	all year	001
n-Octadecane	daily maximum	≤ .777 lb/d	all year	001
2-Butanone	daily average	≤ 1.85 mg/L	all year	001
2-Butanone	daily maximum	≤ 4.81 mg/L	all year	001
2-Butanone	daily average	≤ 2.44 lb/d	all year	001
2-Butanone	daily maximum	≤ 6.34 lb/d	all year	001
o-Cresol [2-Methylphenol]	daily average	≤ .561 mg/L	all year	001
o-Cresol [2-Methylphenol]	daily maximum	≤ 1.92 mg/L	all year	001
o-Cresol [2-Methylphenol]	daily average	≤ .74 lb/d	all year	001
o-Cresol [2-Methylphenol]	daily maximum	≤ 2.53 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	daily average	≤ 10 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 20 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily average	≤ 16.6 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 33.3 lb/d	all year	001
Acetone	daily average	≤ 7.97 mg/L	all year	001
Acetone	daily maximum	≤ 30.2 mg/L	all year	001
Acetone	daily average	≤ 10.5 lb/d	all year	001
Acetone	daily maximum	≤ 39.8 lb/d	all year	001
Acetophenone	daily average	≤ .0562 mg/L	all year	001
Acetophenone	daily maximum	≤ .114 mg/L	all year	001
Acetophenone	daily average	≤ .0741 lb/d	all year	001
Acetophenone	daily maximum	≤ .15 lb/d	all year	001
Hydrocarbons, petroleum	daily average	≤ 15 mg/L	all year	001
Hydrocarbons, petroleum	daily maximum	≤ 15 mg/L	all year	001
Hydrocarbons, petroleum	daily average	≤ 25 lb/d	all year	001
Hydrocarbons, petroleum	daily maximum	≤ 25 lb/d	all year	001
pH	minimum	≥ 6 SU	all year	003
pH	maximum	≤ 9 SU	all year	003
Solids, total suspended	daily average	≤ 50 mg/L	all year	003
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	003
Solids, total suspended	daily average	report only (mg/L)	all year	003
Solids, total suspended	daily maximum	report only (mg/L)	all year	003
Solids, total suspended	daily average	report only (mg/L)	all year	003
Solids, total suspended	daily maximum	report only (mg/L)	all year	003
Oil & Grease	daily maximum	≤ 15 mg/L	all year	003
Arsenic, total [as As]	daily average	≤ .1 mg/L	all year	003
Arsenic, total [as As]	daily maximum	≤ .3 mg/L	all year	003
Copper, total [as Cu]	daily average	report only (mg/L)	all year	003
Copper, total [as Cu]	daily maximum	report only (mg/L)	all year	003
Nickel, total [as Ni]	daily average	≤ .12 mg/L	all year	003
Nickel, total [as Ni]	daily maximum	≤ .25 mg/L	all year	003
Silver, total [as Ag]	daily average	≤ .007 mg/L	all year	003
Silver, total [as Ag]	daily maximum	≤ .016 mg/L	all year	003
Zinc, total [as Zn]	daily maximum	report only (mg/L)	all year	003
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	003
pH	minimum	≥ 6 SU	all year	004
pH	maximum	≤ 9 SU	all year	004
Solids, total suspended	daily average	≤ 50 mg/L	all year	004
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	004
Solids, total suspended	daily average	report only (mg/L)	all year	004
Solids, total suspended	daily maximum	report only (mg/L)	all year	004
Solids, total suspended	daily average	report only (mg/L)	all year	004
Solids, total suspended	daily maximum	report only (mg/L)	all year	004
Oil & Grease	daily maximum	≤ 15 mg/L	all year	004
Arsenic, total [as As]	daily average	≤ .1 mg/L	all year	004
Arsenic, total [as As]	daily maximum	≤ .3 mg/L	all year	004
Copper, total [as Cu]	daily average	report only (mg/L)	all year	004
Copper, total [as Cu]	daily maximum	report only (mg/L)	all year	004
Nickel, total [as Ni]	daily average	≤ .12 mg/L	all year	004
Nickel, total [as Ni]	daily maximum	≤ .25 mg/L	all year	004
Silver, total [as Ag]	daily average	≤ .007 mg/L	all year	004
Silver, total [as Ag]	daily maximum	≤ .016 mg/L	all year	004
Zinc, total [as Zn]	daily average	≤ .25 mg/L	all year	004
Zinc, total [as Zn]	daily maximum	≤ .53 mg/L	all year	004
Selenium, total [as Se]	daily average	report only (mg/L)	all year	004
Selenium, total [as Se]	daily maximum	report only (mg/L)	all year	004
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	004
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	004
Cyanide, free available	daily average	≤ .0088 mg/L	all year	004
Cyanide, free available	daily maximum	≤ .0185 mg/L	all year	004
pH	minimum	≥ 6 SU	all year	005
pH	maximum	≤ 9 SU	all year	005
Solids, total suspended	daily average	≤ 50 mg/L	all year	005
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	005
Solids, total suspended	daily average	report only (mg/L)	all year	005
Solids, total suspended	daily maximum	report only (mg/L)	all year	005
Solids, total suspended	daily average	report only (mg/L)	all year	005
Solids, total suspended	daily maximum	report only (mg/L)	all year	005
Oil & Grease	daily maximum	≤ 15 mg/L	all year	005
Copper, total [as Cu]	daily average	report only (mg/L)	all year	005
Copper, total [as Cu]	daily maximum	report only (mg/L)	all year	005
Zinc, total [as Zn]	daily maximum	report only (mg/L)	all year	005
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	005
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	005
Oxygen demand, chem. [high level] [COD]	daily maximum	≤ 150 mg/L	all year	006
pH	minimum	≥ 6 SU	all year	006
pH	maximum	≤ 9 SU	all year	006
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	006
Oil & Grease	daily maximum	≤ 15 mg/L	all year	006
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	006
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	006
Whole Effluent Toxicity [WET] - M. beryllina	7-day minimum	≥ 8 %	all year	TX1
Whole Effluent Toxicity [WET] - M. beryllina	monthly average minimum	≥ 8 %	all year	TX1
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	≥ 8 %	all year	TX1
Whole Effluent Toxicity [WET] - Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	≥ 8 %	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia	7-day minimum	report only (%)	all year	TX1
NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia	monthly average minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia	7-day minimum	report only (%)	all year	TX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia	monthly average minimum	report only (%)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia	7-day minimum	report only (pass=0;fail=1)	all year	TX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia	monthly average minimum	report only (pass=0;fail=1)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia	7-day minimum	report only (%)	all year	TX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Menidia menidia	monthly average minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	7-day minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	monthly average minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia	7-day minimum	report only (%)	all year	TX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Menidia menidia	monthly average minimum	report only (%)	all year	TX1
LC50 Pass/Fail Static 24Hr Acute Americamysis bahia (formerly Mysidopsis bahia)	single sample	report only (pass=0;fail=1)	all year	TXA
LC50 Pass/Fail Static 24Hr Acute Menidia menidia	single sample	report only (pass=0;fail=1)	all year	TXA

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0092282 · MCP: https://passage-data.com/mcp