Dataset Groups Activity Stream List of 3rd Party Organizations for Closed Loop Well Contractors The list contains a list of approved 3rd Party Organizations that can provide certification to closed loop well contractors. Last Update October 2014. Data and Resources dataCSV Explore Preview Download 3rd party closed loop well Additional Info Field Value Last Updated August 14, 2017, 19:38 (UTC) Created August 14, 2017, 19:38 (UTC)