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The Washington State Department of Health (DOH) cross cor+nection regulations require water <br />purveyors, such as Evere:�, :o maintain safe drinking water by taking precautions to ensure that fire <br />protection water in both commercial and residential sprinkler systems dces not backFlow into the public <br />system. In the past, single check valves were considered as an adFquate backFlow device for commercial <br />properties. However, DOH has determined that double chec.k detector assemblies (DCDA) are the <br />minimum acceptable backFlow protection device for comme�cial fire protection systems. Some <br />commerciai buildings in Everett still have single check-valves inslalled, which now must be upgraded to a <br />DCDA for commercial fire services when new construction is planned that r�ill affect fire services. This <br />additional prote�tion is necessary to adhere to COH regulations and ensure safe drinking water. <br />Sincerely, <br />� ���� <br />Tim Markham, WQCO <br />Cross Connection Specialist <br />cc: Permit Services Manager Paul McKee, Assistant Fire Marshal Jim Venturo, Utilities Record� Man�ger <br />Verl Sly, Meg lialey <br />CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 •(425) 257-8800 • Fax (425) 257-8882 <br />