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The nursing home must:
(1) Prohibit all cross connections between potable and nonpotable water;
(2) Use backflow prevention devices on plumbing fixtures, equipment, facilities, buildings, premises or areas which are actual or potential cross-connections to prevent the backflow of water or other liquids, gases, mixtures or substances into a water distribution system or other fixtures, equipment, facilities, buildings or areas; and
(3) Follow guidelines, practices, procedures, interpretations and enforcement as outlined in the manual titled "Accepted Procedure and Practice in Cross-Connection Control; Pacific NW Edition; American Waterworks Association," or any successor manual, referenced in chapter 246-290 WAC for public water supply.