The state regulations and/or the Uniform Plumbing Code require testing all assemblies annually. But regulations aside, keeping all of your assemblies in good condition not only reduces your legal liability exposure, it also lowers your actual maintenance costs as well. It’s smart to catch problems while they’re minor, rather than wait until an emergency arises, such as when a device starts to dump hundreds of gallons of water per minute out it’s relief valve into an office or room. Annually testing your devices is the only way to guarantee that all internal components of your device are working.