All backflow preventers are required by Illinois law to be tested once per year. The same annual requirement applies in Indiana. This isn’t just a recommendation, it’s a legal obligation for both residential and commercial property owners who have backflow prevention devices installed. It’s also worth noting that some municipalities have specific submission deadlines, meaning your test results must be received by your water authority before a set date each year. Missing that window can result in late notices, fines, or even water service interruption. Contact us today to schedule!