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• • <br /> 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) are 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 /> C,/")))) <br /> CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) 257-8800 • Fax(425)257-8882 <br />