Gunderson Plumbing — Your Neighborhood Plumber! We are a family owned & operated full-service commercial and residential plumbing company. We are fully licensed, bonded and insured. Established in 1972, by Ralph Gunderson and now operated by his daughters and lead plumber Jason Williams. Ralph Gunderson, an icon in the community has honestly and successfully provided plumbing and septic services to businesses and residential clients in the McHenry and Lake County regions for over 40 years.