Appalachia Midstream Files Permit for Pennsylvania Gas Pipeline

Appalachia Midstream has filed permits to build a new 12-inch natural gas pipeline in Pennsylvania, marking another regulatory step for Marcellus gas infrastructure expansion.

(P&GJ) — Appalachia Midstream Services LLC has filed state and federal permit applications to construct a new natural gas pipeline in north-central Pennsylvania, according to a notice published in the Pennsylvania Bulletin.

The proposed project involves the installation of approximately 16,200 ft (3.07 miles) of 12-in. steel natural gas pipeline in McNett Township, Lycoming County, supporting Marcellus Shale development tied to existing Williams pipeline infrastructure. The application was received Dec. 15, 2025, and is under review by the Pennsylvania Department of Environmental Protection and the U.S. Army Corps of Engineers’ Baltimore District.

Plans call for two permanent and two temporary stream crossings, along with seven permanent and nine temporary wetland crossings. Pipeline installation would use open-cut trenching methods, while equipment crossings would rely on timber matting.

According to the filing, the project would result in 7 ft (7 sq ft) of permanent stream impacts and 165 ft (392 sq ft) of temporary stream impacts. Permanent wetland impacts total 9,475 sq ft (0.22 acres), while temporary wetland impacts would reach 34,089 sq ft (0.78 acres). Temporary floodway impacts are estimated at 14,495 sq ft (0.33 acres).

The pipeline would connect the existing Hemlock Pad A well pad to a proposed surface site permitted under Vista Pipeline’s erosion and sediment control plan, enabling additional gas gathering and takeaway capacity in the region.

Public comments may be submitted to the DEP within 30 days of the notice. The agency may schedule a fact-finding hearing or informal conference if warranted.