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Home Services About Us More Mission Sierra Quest Human Services Foundations mission is to change lives through developing meaningful relationships that build our participants individual strengths while involving them in therapeutically based culturally relevant traumainformed age and developmentally appropriate supportive programs and prosocial community activities. Sierra Quest is accredited by The Joint Commission. If you have any quality or safety concerns and would like to report them directly to The Joint Commission please do so through the website httpswww. jointcommission.