Wolk won a seat on the Davis City Council in 1990, and served two terms as Mayor from 1992 to 1994 and 1996 to 1998. She then served as Yolo CountySupervisor from 1998 to 2002, chairing the Board in 2000. Wolk was elected to the California State Assembly in 2002, and won re-election in 2004 and 2006. Wolk was Chair of the Assembly Water, Parks and Wildlife Committee and she served on Assembly Committees on Budget, Local Government, and Natural Resources, as well as the Budget Subcommittee on Transportation and Information Technology. In addition, Wolk served on numerous Select Committees including Biotechnology; California Children’s School Readiness and Health; Domestic Violence; Growth and Infrastructure; Ports; Water, Infrastructure and the Economy; Rural Economic Development; and Wine. In her five years in the Assembly, Wolk succeeded in authoring 56 new laws. In 2007, Governor Arnold Schwarzenegger signed many Wolk-authored bills including legislation to improve flood protection in flood-prone areas of California’s Central Valley; improve safety on a treacherous stretch of State Highway 12; require more planning for state parks and recreation opportunities for the Central Valley; and provide the Department of Fish and Game with the authority to control highly invasive species that threaten California's water delivery and natural ecosystems. Wolk has been honored by many organizations for her public service, including the Planning and Conservation League, which named Wolk its 2007 Legislator of the Year for her leadership in water policy and legislation, and for championing a landmark package of flood protection bills to strengthen flood protection in California’s Central Valley and Sacramento-San Joaquin Delta region. In 2007, both the Highway 12 Association and Solano Transportation Authority honored Wolk for her tireless work to develop a Highway 12 safety package with the California Department of Transportation and California Highway Patrol, and for authoring legislation to establish a safety enhancement double fine zone on a dangerous stretch of State Highway Route 12. Wolk termed out of the Assembly in 2008, and ran for the California State Senate in the 5th district, the seat held by Michael Machado. Wolk defeated her Republican opponent, fellow assembly-member Greg Aghazarian of Stockton. In 2015, Wolk co-sponsored, with Bill Monning, the SB-128 California End of Life Option Act which allows residents of California who meet strict criteria to exercise their right to die through medical aid in dying. Wolk, who is Jewish, is a member of the California Legislative Jewish Caucus.