What is the main reason for the annual test? It is to protect your water from contamination. It is an EPA assures that RPZ prevention systems are connected to any public water system, and that is why they must be tested once per year. Maybe your RPZ has been connected to a sprinkler system that’s been unplugged this winter.
Whatever the situation, if you have such a system on your Elgin area property, please make sure that it is professionally checked by Tom’s Plumbing of Elgin. It is part of being a responsible homeowner in this area. Call Tom’s Plumbing at (847) 697-6444. See them on the web at tomsplumbingservice.com.