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The Washington State Department of Health (DOH) cross connection regulatlons require water <br /> purveyors, such as Everett, to maintain safe drinking water by taking precautfons to ensure that fire <br /> protedion water in both commercial and residential sprinkler systems dces not backflow into the publfc <br /> system. In the past, single check valves were considered as an adequate backflow device for commercial <br /> properlies. However, DOH has determined that d�wble check detector assemblies (DCDA) are the <br /> minimum acceptable backFlow protection device (or commercial fire protectlon systems. Some <br /> commercial buildings in Everett still have single check-valves installed, which now must be upgraded to a <br /> DCDA (or commercial fire services when new construction is planned that will affect Flre services. This <br /> adAitlonal protedion is necessary to adhere to DOH regulations and ensure safe drinking wa[er. <br /> Sincerely, <br /> � ����.k_ <br /> Tim Markham, WQCO <br /> Cross Connection Specialist <br /> cc: Permit Services Manager Paul McKee, Assfstant Fire Marshal ]im Venturo, Utilitles Records Manager <br /> Verl Sly, Meg Haley <br /> CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) 257-8800 • 'ax(425) 257-8882 <br />