Hilcorp Alaska, LLC

NPDES permit AK0055913 · Minor NON-POTW · administratively continued, expires 2026-07-27 · 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 2026-07-27 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)

0of 55 forms filed late

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

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).

Outfall 004, form AM (004AM-Graywater from MODU when working at Tyonek Platform (Monthly)): every 1 month(s), 4 values
Outfall 006, form AM (006A Blowout Preventer Fluid discharge from MODU when at Tyonek Platform (Monthly)): every 1 month(s), 3 values
Outfall 009, form AM (009A Non-Contact Cooling Water from MODU at Tyonek Platform (Monthly)): every 1 month(s), 3 values
Outfall 010, form AM (010AM Uncontaminated Ballast Water from MODU when at Tyonek Platform (Monthly)): every 1 month(s), 3 values
Outfall 012, form AM (012AM Excess Cement Slurry discharge form MODU when at Tyonek Platform): every 1 month(s), 3 values

Limits in force (16)

Outfall	Parameter	Statistic	Limit	Months
004	Floating solids, waste or visible foam-visual	VALUE	<= 0 abst=0;prst=1	all year
004	Chlorine, total residual	MAXIMUM	<= 1 mg/L	all year
004	Volume	MO TOTAL	report only	all year
004	Oil and grease visual	VALUE	<= 0 abst=0;prst=1	all year
006	Flow	MO AVG	report only	all year
006	Flow	DAILY MX	report only	all year
006	Oil and grease visual	MAXIMUM	<= 0 abst=0;prst=1	all year
009	Flow	MO AVG	report only	all year
009	Flow	DAILY MX	report only	all year
009	Oil and grease visual	MAXIMUM	<= 0 abst=0;prst=1	all year
010	Flow	MO AVG	report only	all year
010	Flow	DAILY MX	report only	all year
010	Oil and grease visual	MAXIMUM	<= 0 abst=0;prst=1	all year
012	Flow	MO AVG	report only	all year
012	Flow	DAILY MX	report only	all year
012	Oil and grease visual	MAXIMUM	<= 0 abst=0;prst=1	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