Blue Mountain Humane Society | 320 followers on LinkedIn. The mission of the Blue Mountain Humane Society is to prevent cruelty and promote kindness to companion animals in our community. Blue Mountain Humane Society was founded in 1967 by a group of local residents committed to creating positive outcomes for animals in the Walla Walla Valley. Over the years, the Society has grown and evolved to include a humane, state-of-the-art no-kill shelter facility designed to serve companion animals.