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The Washinglon State Department of Health (DOH) cross connedion regulations require water <br /> purveyors, such as Everett, to maintain safe drinking water by taking precautions to ensure that fire <br /> protedion water in both commercial and residential sprinkler systems dces not backFlow into the public <br /> system. In the past, single check vatves were considered as an adequate backFlow device for commercial <br /> properties. However, DOH has determined that double check detedor assemblies (DCDA) are the <br /> minimum acceptable backflow protedion 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 affed fire services. This <br /> additional protedion is necessary to adhere lo DOH regulations and ensure safe drinking water. <br /> Sincerely, <br /> � ���r.� <br /> Tim Markham, WQCO <br /> Cross Connedion Specialist <br /> cc: Permit Services Manager Paul McKee, Assistant Fire Marshal Jim Venturo, Utilities Records Manager <br /> Verl Siy, Meg Haley <br /> CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) 257-8800 • Fax (425) 257-8882 <br />