The outrageous amount of violations have led local governments to draft new legislation on permits and construction regulations for oil pipeline projects.
"This project threatens some of our most basic American values; I think you'll find the people in Pennsylvania care a lot about public safety especially of their most vulnerable residents – children and seniors."
Sunoco has 30 days to submit more information to DEP for them to conduct a review on whether or not construction can proceed.
Environmentalists emphasized that while they welcomed the drilling delay, they saw it as no reason for those opposed to the pipeline to become complacent or slow their efforts.
The companies insist that they will continue construction on the pipeline without rerouting it around Lake Oahe, despite being denied the legal right to do so.
Sunoco spills crude more often than any of its competitors and has had more than 200 leaks since 2010.