Hilcorp — NPDES permit AK0053767: limits, due date and EPA's record

NPDES permit AK0053767 · Minor NON-POTW · administratively continued, expires 2023-06-30 · 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.

This permit expired on 2023-06-30 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

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among AK permits in EPA's filings — check your permit).

Limits in force (19)

Outfall	Parameter	Statistic	Limit	Months
001	Temp. diff. between samp. & upstrm deg. C	MO AVG	report only	all year
001	Temp. diff. between samp. & upstrm deg. C	DAILY MX	<= 39 deg C	all year
001	BOD, 5-day, 20 deg. C	MO AVG	<= 30 mg/L	all year
001	BOD, 5-day, 20 deg. C	DAILY MX	<= 60 mg/L	all year
001	pH	INST MIN	>= 6.5 SU	all year
001	pH	INST MAX	<= 8.5 SU	all year
001	Solids, total suspended	MO AVG	<= 30 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 60 mg/L	all year
001	Copper, total recoverable	MO AVG	<= 24 ug/L	all year
001	Copper, total recoverable	DAILY MX	<= 48 ug/L	all year
001	Floating solids, waste or visible foam-visual	VALUE	report only	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	<= 20800 gal/d	all year
002	pH	INST MIN	>= 6.5 SU	all year
002	pH	INST MAX	<= 8.5 SU	all year
002	Salinity	MO AVG	<= 289 ppk	all year
002	Salinity	DAILY MX	<= 580 ppk	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	<= 111500 gal/d	all year