Adding a fertilizer or chemical injector to an irrigation system changes what the system is, from a water-protection standpoint. It stops being a line full of yard water and becomes a line full of concentrate.
This is a health hazard connection, and it is treated as one everywhere. An injector also introduces the possibility of backpressure, because the injection equipment itself can push. Health hazard plus backpressure is the combination that calls for the highest level of protection available, which in practice means a reduced pressure assembly.
If you are considering adding injection to an existing system, the backflow assembly almost certainly has to change with it. That is worth pricing before the injector, not after — and it is a conversation worth having with us first, because the assembly is frequently the larger of the two numbers.
Which assembly your provider will accept depends on their cross-connection control program and the code in force where you are. The seven device types we see on the Western Slope.
Schedule a backflow test or call 970-835-9661