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The Washington State Department of Health (DOH) cross connection regula[ions require water <br /> purveyors, such as Everett, to maintain safe drinking water by taking precautions to ensure that fire <br /> pro[ection water in both commercial and residential spiinkler sysfems does not backflow into the public <br /> system. In the past, single check valves were considered as an adequate back(low device (or commercial <br /> properties. However, DOH has determined that double check detector assemblies (DCDA) are the <br /> minimum acceptaBle backflow protection dev�ce for commercial fire protection systems. Some <br /> commeraal buildings in Everett still have single cneck-valves installed, which now must be upgraded to a <br /> DCDA for commerciai fire services when new construction is planned that will affed fire services. lhis <br /> addi:ional protedion is nccessary to adhere to DOH regulatiuns and ensure safe drinking water. <br /> Sincerely, <br /> � hh�.�-.r-�'-� <br /> Tim Markham, WQCO <br /> Cross Connection Specialist <br /> cc: Permit Services Manager Paul McKee, Assisfant Fire Marshal Jim Venturo, Utilities Records hlanager <br /> Verl Sly, Pteg Haley <br /> � <br /> CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) 257-8800 • Fax (425) 257-8682 <br />