The Adorers of the Blood of Christ order has filed a complaint against the Federal Energy Regulatory Commission (FERC) in a bid to keep the pipeline off their land.
The Adorers, an order of 2,000 nuns across the world, have made protection of the environment central to their mission.
The plan for the pipeline “goes against everything we believe in – we believe in the sustenance of all creation”, Sister Linda Fischer, 74, told the Washington Post.
A section of the pipeline is planned to run underneath a strip of land owned by the Adorers in West Hempfield Township, Lancaster County, and leased to a local farmer.
If the court rules against the nuns, Lancaster Against Pipelines, a local activist group, has pledged to mount a round-the-clock vigil at the chapel.