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NIST Receives New Patent for Microbe Killing Water Heater NIST The Department of Health requires annual backflow testing. It is not optional. A backflow prevention device keeps your water supply separate from potential contamination sources irrigation systems, chemical lines, car washes, fire new water main length to require bac t testing Backflow Assembly requirements in Liberty Lake Liberty Lake Sewer and District Bac T Testing Request Long Advanced Home Water Test Kit Well or City EPA Certified Drinking Water Labs
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