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The Washington State Department of Health (DOH) cross connection regulations require water <br />purveyors, such as Everett, to maintain safe drinking water by taking precautions to ensure that fire <br />protection water in both commercial and residential sprinkler systems does not backflow into the public <br />system. In the past, single check valves were considered as an adequate backflow device for commercial <br />properties. However, DOH has determined that double check detector assemblies (DCDA) arc the <br />minimum acceptable backflow protection device for commercial fire protection systems. Some <br />commercial buildings in Everett still have single check -valves installed, which now must be upgraded to a <br />DCDA for commercial fire services when new construction is planned that will affect fire services. This <br />additional protection is necessary to adhere to DOH regulations and ensure safe drinking water. <br />Sincerely, <br />Tim Markham, WQCO <br />Cross Connection Specialist <br />cc: Permit Services Manager Paul McKee, Assistant Fire Marshal Jim Venturo, Utilities Records Manager <br />Verl Sly, Meg Haley <br />CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) 257-8800 • Fax (425) 257-8882 <br />