BACK FLOW PREVENTION Home › Forums › Public Forums › General Plumbing › BACK FLOW PREVENTION This topic has 1 reply, 2 voices, and was last updated 21 years, 10 months ago by Retired plbg1. Viewing 1 reply thread Author Posts 28 Oct 2002 at 1:50 am #275910 MasterPlumbersKeymaster IN OHIO, LICKING COUNTY- TO BE EXACT., IS BACK FLOW PREVENTERS REQUIRED IN ALL PUBLIC BUILDINGS?IF THEY ARE, HOW OFTEN DO THEY HAVE TO BE CHECKED AND RECERTIFIED, AND BY WHOM, DOES THE PERSON HAVE TO BE A CERTIFIED BACK FLOW CHECKER? 28 Oct 2002 at 11:47 am #293114 Retired plbg1Participant Check with your local Plbg. dept. They have to be checked every yr. by a cerified Back flow tester. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In