How many times has the keystone pipeline leaked?

The Keystone Pipeline has experienced several leaks since it began operating in 2010, with at least 21 notable incidents reported by the end of 2021. These leaks have varied in size and impact, with some resulting in significant environmental concerns. The most substantial leak occurred in 2017, releasing approximately 210,000 gallons of oil in South Dakota. Ongoing monitoring and maintenance efforts continue to address the pipeline's integrity.