"Recent acts of sabotage against U.S. pipelines have raised concern about the security of the nation's energy pipeline system and the federal program to protect them. On March 20, 2017, the developer of the Dakota Access Pipeline alleged in a court filing that it had experienced 'recent coordinated physical attacks along the pipeline.' [...] In the 114th Congress, three pipeline security issues came under particular scrutiny: TSA's [Transportation Security Admnistration] use of voluntary standards, the agency's pipeline threat assessments, and the resources devoted to TSA's pipeline division. Although TSA believes a voluntary approach to U.S. pipeline security is most effective, in 2010, the National Energy Board of Canada mandated security regulations for jurisdictional Canadian petroleum and natural gas pipelines. Canada's decision to regulate security raises questions as to the relative merits of a voluntary versus regulatory approach. Some policymakers also have questioned whether the TSA devotes enough funding to pipeline security relative to other surface transportation modes."
CRS Insight, IN10603
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html