We’ve made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Public Notice: Proposed Permit for Hilcorp Alaska Liberty Drilling and Production Island

Publish Date: 08/18/2017


EPA is proposing to issue a National Pollutant Discharge Elimination System (NPDES) permit to Hilcorp Alaska, LLC authorizing wastewater discharges associated with oil and gas development and production activities on the Liberty Drilling and Production Island.

To ensure protection of water quality and human health, the permit places limits and conditions on the discharge of pollutants from the facility to Stefansson Sound in the Beaufort Sea at a location approximately 4.78 nautical miles (8.85 kilometers) offshore in federal waters of the outer continental shelf.

EPA’s issuance of the NPDES permit constitutes a major federal action subject to compliance with the National Environmental Policy Act.  The EPA is cooperating with the Bureau of Ocean Energy Management (BOEM) to develop the Environmental Impact Statement (EIS) and intends to adopt the document to satisfy our NEPA compliance obligations.  BOEM published the Notice of Availability of the Draft EIS in the Federal Register on August 18, 2017.  EPA is aligning our public comment period with the Draft EIS. Visit BOEM's Hilcorp/Liberty Project webpage.

EPA is requesting public comments on the draft NPDES permit, technical fact sheet, and the Ocean Discharge Criteria Evaluation (ODCE) that analyzes impacts from the discharges. The public comment period closes on November 16, 2017. 

Tentative Determination

EPA Region 10 is proposing to issue a NPDES permit to Hilcorp Alaska, LLC, which would authorize wastewater discharges from the Liberty Drilling and Production Island.

State Certification

The facility is located within federal waters of the Beaufort Sea. As the permit does not authorize discharges to Alaska State waters, it is not subject to Clean Water Act Section 401 certification.

Administrative Record

Electronic copies of the draft permit, fact sheet, and Ocean Discharge Criteria Evaluation (ODCE) are available below under "Related Documents."

Copies and other information may be requested by writing to the EPA at the address below, or by contacting Audrey Washington (washington.audrey@epa.gov), 206-553‑0523.

U.S. EPA Region 10
NPDES Permits Unit
1200 Sixth Avenue, Suite 900
Seattle, Washington, 98101

Disability Reasonable Accomodation

If you need a reasonable accommodation for a disability, please call Audrey Washington at 206-553‑0523 (voice). TTY/TDD users please dial Washington Relay Service at 1-800-833-6388. Please provide one week advance notice for special requests not related to ongoing programs and services.

Applicant or Respondent

Hilcorp Alaska, LLC
3800 Centerpoint Drive, Suite 400
Anchorage, AK 99503

Permit #: AK0053085