- Caccia Plumbing is the best plumber in Hillsborough. They can been seen throughout San Mateo County. My water heater and kitchen faucet have both been replaced by Caccia Plumbing. They are honest, detail oriented and very professional. Caccia Plumbing also gives back to the Burlingame and Hillsborough communities through participating in local events. They are a true gem to all of San Mateo County! I love having these guys in my neighborhood!