EXTEX OPERATING COMPANY-SHIP SHOAL BLOCK 43 — NPDES permit LA0126462: limits, due date and EPA's record

NPDES permit LA0126462 · Minor NON-POTW · effective, expires 2029-03-31 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (84)

Outfall	Parameter	Statistic	Limit	Months
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Oil & Grease	MO AVG	<= 29 mg/L	all year
002	Oil & Grease	DAILY MX	<= 42 mg/L	all year
002	Lead, total [as Pb]	MO AVG	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Thallium, total [as Tl]	MO AVG	report only	all year
002	Thallium, total [as Tl]	DAILY MX	report only	all year
002	Radium 226, total	MO AVG	report only	all year
002	Radium 226, total	DAILY MX	report only	all year
002	Radium 228, total	MO AVG	report only	all year
002	Radium 228, total	DAILY MX	report only	all year
002	Phenolics, total recoverable	MO AVG	report only	all year
002	Phenolics, total recoverable	DAILY MX	report only	all year
002	Benzene	MO AVG	report only	all year
002	Benzene	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Critical Dilution	MO AVG	report only	all year
002	Critical Dilution	DAILY MX	report only	all year
002	Benzene, calculated limit	MO AVG	report only	all year
002	Benzene, calculated limit	DAILY MX	report only	all year
002	Lead, calculated limit	MO AVG	report only	all year
002	Lead, calculated limit	DAILY MX	report only	all year
002	Phenol, calculated limit	MO AVG	report only	all year
002	Phenol, calculated limit	DAILY MX	report only	all year
002	Thallium, calculated limit	MO AVG	report only	all year
002	Thallium, calculated limit	DAILY MX	report only	all year
002	Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	7 DA MIN	report only	all year
002	Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)	MO AV MN	report only	all year
002	Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina	7 DA MIN	report only	all year
002	Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina	MO AV MN	report only	all year
002	NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7 DA MIN	report only	all year
002	NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	MO AV MN	report only	all year
002	NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina	7 DA MIN	report only	all year
002	NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina	MO AV MN	report only	all year
002	NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7 DA MIN	report only	all year
002	NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	MO AV MN	report only	all year
002	NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina	7 DA MIN	report only	all year
002	NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina	MO AV MN	report only	all year
002	Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	7 DA MIN	report only	all year
002	Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia)	MO AV MN	report only	all year
002	Coef Of Var Static Renewal 7Day Chronic Menidia beryllina	7 DA MIN	report only	all year
002	Coef Of Var Static Renewal 7Day Chronic Menidia beryllina	MO AV MN	report only	all year
003	Oil & Grease	MO AVG	<= 29 mg/L	all year
003	Oil & Grease	DAILY MX	<= 42 mg/L	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
004	BOD, 5-day, 20 deg. C	DAILY MX	<= 45 mg/L	all year
004	pH	INST MIN	>= 6 SU	all year
004	pH	INST MAX	<= 9 SU	all year
004	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
004	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
004	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
004	Chlorine, total residual	MINIMUM	>= 1 mg/L	all year
004	Chlorine, total residual	MAXIMUM	<= 2 mg/L	all year
004	Enterococci	MOAV GEO	<= 35 #/100mL	all year
004	Enterococci	DAILY MX	<= 135 #/100mL	all year
004	Solids, floating - visual determination	DAILY MX	<= 0 d	all year
005	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
005	Solids, floating - visual determination	DAILY MX	<= 0 d	all year
006	pH	INST MIN	>= 6 SU	all year
006	pH	INST MAX	<= 9 SU	all year
006	Solids, total suspended	DAILY MX	report only	all year
006	Solids, total suspended	DAILY MX	<= 90 mg/L	all year
006	Solids, total suspended	DAILY MX	<= 90 mg/L	all year
006	Solids, total suspended	DAILY MX	report only	all year
006	Oil & Grease	DAILY MX	<= 15 mg/L	all year
006	Carbon, tot organic [TOC]	DAILY MX	<= 50 mg/L	all year
006	Lead, total [as Pb]	DAILY MX	<= 50 ug/L	all year
006	Benzene	DAILY MX	<= 50 ug/L	all year
006	BTEX	DAILY MX	<= 250 ug/L	all year
006	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
006	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
007	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
007	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
008	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
008	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
008	Critical Dilution	MO AVG	report only	all year
008	Critical Dilution	DAILY MX	report only	all year
008	Coef Of Var Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)	48HR MIN	report only	all year
008	Coef Of Var Static Renewal 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)	MO AV MN	report only	all year
008	Coef Of Var Static Renewal 48Hr Acute Menidia beryllina	48HR MIN	report only	all year
008	Coef Of Var Static Renewal 48Hr Acute Menidia beryllina	MO AV MN	report only	all year