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The Washinglon Slate Deparlment 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 in[o the public <br />system. In the past, single check valves were considered as an adequate back(low device for commercial <br />properties. However, DOH has determined that doubie check deteccor assemblies (DCDA) are the <br />minimum acceptable backflow protection device for co�imercial 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 commerciai fire services when new conslruction is planned that will affect fire services. This <br />additional protection is necessary to adhere to DGH regulztions and ensure safe drinking water. <br />Sincerely, <br />� ����-ti-c�-,.� <br />Tim Markham, WQCO <br />Cross Connection Specialist <br />cc: Permit Services Manager Paul McKee, Assistanf Fire Marshal Jim \�enturo, Utilities Records Mane,ger <br />Veri Sly, Meg Haiey <br />CITY OF f_VERETT • 3200 Cedar Street • Everett, WA 98207 •(425) 257-8800 • Fax (425) 257-8882 <br />