This is why some are worried about the Keystone XL Pipeline. Have you ever heard of the Kalamazoo River tar sands oil spill from 2010 which has cost $1 billion and still is not cleaned up? Dozens of families permanently lost their homes near the formerly lovely river.
The odds though are pretty low, especially with the amount of pipeline and the few incidents we’ve had. You can never be 100% safe and, in the case of Keystone, the more independent will probably be a safer bet than the miniscule risk like you mentioned.