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Pipeline Siting in Washington

The UTC does not oversee siting for pipeline facilities. 

Intrastate Facilities

Siting for intrastate gas facilities is conducted by the Energy Facility Site Evaluation Council (EFSEC). EFSEC siting criteria:

  • Crude or refined petroleum or liquid petroleum product pipelines larger than 6 inches in diameter and greater than 15 miles in length.
  • Natural Gas, synthetic fuel, gas, or liquidfied petroleum gas pipelines larger than 14 inches in diameter and greater than 15 miles.

Interstate Facilities

​Interstate gas pipeline facilities in Washington are sited by the Federal Energy Regulatory Commission (FERC).

Small Facilities

There is no state or federal siting authority for the following transmission pipelines:

  • Gas transmissions pipelines six inches or less in diameter and less than 15 miles in length.
  • Liquid lines less than 14 inches in diameter and less than 15 miles in length.