Western Health Advantage Western Health Advantage is the choice of many businesses—from Fairfield to Fremont and Penryn to Petaluma. That’s because for more than 20 years Western Health Advantage has been a reliable partner in our communities. WHA acts with integrity and interacts honestly with our partners, while building relationships of trust. We strengthen our neighborhoods and enrich the lives of community members by supporting local organizations. WHA is a quality choice for local business owners seeking affordable, responsive health coverage for their employees. For more information, visit westernhealth.com.