Since the soil in your landscape contains organic matter, microbes, fertilizers and other potentially harmful chemicals, the EPA mandates that all irrigation systems be equipped with an RPZ device. This device prevents the water in your sprinkler system from mixing with the water in your house, as well as with the city's main water line.
Illinois law
Geoff Silver —
A bit pricey IMO but the tech who always comes out does good work. The office however routinely sends me bills that are for
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Irrigation in Highland Park, IL