Boston Ship Repair — NPDES permit MA0040142: limits, due date and EPA's record

NPDES permit MA0040142 · Minor NON-POTW · expired, expires 2026-05-31 · EPA's file as of 2026-09-19

This permit expired on 2026-05-31 and is expired: 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

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (27)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. centigrade	DAILY MX	report only	all year
002	pH	MO AV MN	>= 6.5 SU	all year
002	pH	DAILY MX	<= 8.5 SU	all year
002	pH	DAILY MX	report only	all year
002	Salinity	DAILY MX	report only	all year
002	Solids, total suspended	MO AVG	report only	all year
002	Solids, total suspended	DAILY MX	report only	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	<= 376 ug/L	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	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	<= 8.06 MGD	all year
002	Enterococci	DAILY MX	report only	all year
002	Coliform, fecal general	DAILY MX	report only	all year
002	LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)	MO AV MN	report only	all year
002	LC50 Static 48Hr Acute Menidia	MO AV MN	report only	all year