Wangler Drilling was started in 1988, when Bob Wangler, after moving to BC, purchased a local drilling business in Salmon Arm called MCHarg Drilling. Darrell followed his dad out to BC and began working for the family business at age 19. After working for Wangler Drilling for 20 years, Darrell incorporated his own drilling business in 2007, called Integrity Drilling. Both companies collaborated on several large projects. Darrell later purchased the equipment from Wangler Drilling in 2016, after his father retired. Darrell continues to operate as Integrity Drilling with a total of 30 years of drilling experience.