I seen that you live just down the road from me. I'm on Riverwoods Dr., still a small town (sorta).
I was doing blow outs with a friend of mine with an LCB. At one of my clients house, up on Awbrey butte. Just landscaped this year by an outfit from Portland. The guy only has the city backflow then shutoff valve for irrigation then blow out port. Is that configuration illegal? Isn't there a dedicated backflow for irrigation required in Cen. OR. ?