I definitely hate the idea of more regulation, BUT, when the public's health is at risk then it's ok. Irrigation water is some pretty nasty stuff, I couldn't imagine not having a Backflow. Also in a lot if the country water is becoming more of an issue. Both effective and safe systems are installed by irrigators with experience. Irrigation is not rocket science, so I believe 4 yrs is a little much. I believe a year of repair with your stamp on 20 installs while working under another irrigator would suffice.
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