A state licensed plumber in Ohio can instal a backflow device but you need the backflow certification in order to inspect the device
You are supposed to have a backflow license to install and test--most cities dont follow this yet, but try to put one in in elyria--he will threaten to keep you from working there-by the book, your supposed to have the license to put it in-- read the book--ALSO just did a job in geneva and i had to put it in--they would not let our install plumbers do it--wadsworth is this way too--he actually came out to watch me test and asked me a million questions-like he wasnt sure if i had someone else do the work
And yes i test about a day and a half per week---the wilkins rep is a good friend
it just seems like im failing more watts and replacing more watts devices ---i see pretty much half wilkins-half watts---very rarely do i see a conbraco or febco. Ames are always on the fire line though-- and the threaded cams are pretty easy to replace,but very expensive
In Wisconsin, a plumber can install the rp but it has to be tested by someone who has a cross connection control tester licsense.