NEPTUNE DEEPWATER PORT

NPDES permit MA0040258 · Minor NON-POTW · administratively continued, expires 2013-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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.

This permit expired on 2013-07-31 and is administratively continued: 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

0values over a limit

0required values missing, on 0 form(s)

10of 55 forms filed late

Last period with anything received: 2026-07-31.

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).

Outfall 003, form A (PIPE FLUSHING AND HYDROSTATIC TEST WATER): every 1 month(s), 7 values
Outfall 04A, form 1 (NON-CONTACT COOLING WATER): every 1 month(s), 2 values
Outfall 04B, form 1 (NON-CONTACT COOLING WATER): every 1 month(s), 2 values
Outfall 4AC, form 1 (COOLING WATER FROM HIGH AND LOW SEA CHESTS): every 1 month(s), 1 values
Outfall 4BC, form 1 (COOLING WATER FROM HIGH AND LOW SEA CHESTS): every 1 month(s), 1 values

Limits in force (13)

Outfall	Parameter	Statistic	Limit	Months
003	Flow rate	MAXIMUM	<= 2101 gal/min	all year
003	Oxygen, dissolved [DO]	MINIMUM	>= 6 mg/L	all year
003	pH	MINIMUM	>= 6.5 SU	all year
003	pH	MAXIMUM	<= 8.5 SU	all year
003	Solids, total suspended	MAXIMUM	<= 100 mg/L	all year
003	Sodium Bisulfite	MAXIMUM	<= 11 mg/L	all year
003	Chemical Oxygen Demand [COD]	MAXIMUM	<= 15 mg/L	all year
04A	Temp. diff. between intake and discharge	DAILY MX	<= 8 deg C	all year
04A	Flow	DAILY MX	<= 8.2 MGD	all year
04B	Temp. diff. between intake and discharge	DAILY MX	<= 8 deg C	all year
04B	Flow	DAILY MX	<= 8.2 MGD	all year
4AC	Flow rate	DAILY MX	<= 2.25 gal/min	all year
4BC	Flow rate	DAILY MX	<= 2.25 gal/min	all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states