Best Backflow Preventer Maintenance in Bakersfield CA

I like Carroll Plumbing and Maintenance. Typically use them for routine rooting maintenance. Easy to schedule appointments, prompt and courteous - and they always solve the problem. Much better than any other plumbing outfit we have used. One or two times they have either tracked in some dirt or left a little muck in the bathroom. Not a big deal, but for 5 stars, I'd like things to be left pristine. Recommended.