Utilities Underground Location Center
Keeping Buried Utilities Safe in Washington and Montana since 1978

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About UULC

An Overview of the Utilities Underground Location Center


UULC Mission 
We provide accurate cost-effective one-call service. Through communication, education, and leadership prevent damage to underground utilities and ultimately enhance public safety. 

UULC History
Utilities Underground Location Center (UULC) was started on July 31, 1978, by five Seattle area utilities: Pacific Northwest Bell (US West), Puget sound Power & Light (Puget Sound Energy), Washington Natural Gas (Puget Sound Energy), Seattle City Light, and King County Department of Public Works.

Initial service area of the UULC was King County, Washington. As of 31 July 2007, the UULC provides call before you dig service to 1107 facility owners in Washington & Montana.

UULC Milestones
In July 2007, the UULC processed its 5.7 millionth "Call Before You Dig" call. In FY 06-07, UULC processed 361,724 requests to members to locate buried utilities in Washington & Montana.

UULC Call Center
The call center is operated by One-Call Concepts.

  • One-Call Concepts contact information.