Williston Basin Interstate Pipeline Company (Williston Basin) operates more than 3,700 miles of transmission, gathering and storage lines and owns or leases and operates 30 compressor stations in the states of Montana, North Dakota, South Dakota and Wyoming.

Three underground storage fields in Montana and Wyoming provide storage services to local distribution companies, producers, natural gas marketers and others, and serve to enhance system deliverability. Williston Basin’s system is strategically located near five natural gas-producing basins, making natural gas supplies available to Williston Basin’s transportation and storage customers. The system has 11 interconnecting points with other pipeline facilities, allowing for the receipt and/or delivery of natural gas to and from other regions of the country and from Canada. Williston Basin, which is regulated by the Federal Energy Regulatory Commission (FERC), maintains two headquarters locations, one for administrative functions in Bismarck, N.D., and an operations headquarters in Glendive, Mont. In addition, Williston Basin maintains field offices in Baker, Mont., and in Worland, Wyo.

Williston Basin traces its roots to the 1920s, when several short-haul natural gas pipelines were constructed to connect towns in North Dakota, South Dakota and Montana with several of Montana's natural gas fields. This gas transmission system was known as the Gas Development Co. and its parent company was Montana-Dakota Utilities Co., a predecessor company of MDU Resources Group, Inc.

A major corporate realignment created Williston Basin Interstate Pipeline Company as the interstate natural gas transmission subsidiary of MDU Resources Group, Inc. , in 1985.  MDU Resources has headquarters in Bismarck, N.D. and is traded on the New York Stock Exchange (NYSE: MDU).