Oil and gas companies have yet to fully restore land around half of the 47,505 inactive wells in Colorado, and 72 percent of those un-restored sites have been in the process for more than five years, The Denver Post has found.
The state requires oil and gas companies to restore all sites completely — to reduce erosion, loosen compacted soil, prevent dust storms and control invasions of noxious weeds.
But Colorado does not set a timetable for getting the job done. Nor do state regulators track how long companies take to complete required work.