TENARIS BAY CITY INC — NPDES permit TX0129747: limits, due date and EPA's record

NPDES permit TX0129747 · Minor NON-POTW · effective, expires 2030-06-26 · EPA's file as of 2026-09-19

Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

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 (13)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. fahrenheit	DAILY MX	<= 95 deg F	all year
002	Oxygen demand, chem. [high level] [COD]	DAILY AV	<= 20 lb/d	all year
002	Oxygen demand, chem. [high level] [COD]	DAILY MX	<= 25 lb/d	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Oil & Grease	DAILY AV	<= 1.5 lb/d	all year
002	Oil & Grease	DAILY MX	<= 2 lb/d	all year
002	Copper, total [as Cu]	DAILY AV	<= .044 mg/L	all year
002	Copper, total [as Cu]	DAILY MX	<= .093 mg/L	all year
002	Copper, total [as Cu]	DAILY AV	<= .009 lb/d	all year
002	Copper, total [as Cu]	DAILY MX	<= .02 lb/d	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	<= .025056 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= .03132 MGD	all year