[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-495961-105":59,"doc-detail-495961-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","backflow-prevention-in-food-establishments","Backflow Prevention in Food Establishments","","Backflow prevention guidance for food establishments explains why potable water systems must be protected from unwanted reverse flow that can contaminate clean water lines. It outlines the regulatory basis requiring compliance with state/local rules and the Uniform Plumbing Code, and introduces key terminology used for protection devices. The handout describes common device types, including air gaps, atmospheric vacuum breakers, dual checks with intermediate atmospheric vents, hose connection vacuum breakers, hot boxes, pressure vacuum breakers, and reduced pressure principle assemblies, plus relevant definitions such as cross-connections and certified testers.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/backflow-prevention-in-food-establishments/495961/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/backflow-prevention-in-food-establishments/495961.png","ImageObject",300,407,{"name":92,"@type":93},"Valentina","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-09","2026-10-02",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",12,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"Why is backflow important for food establishments?","Question",{"text":113,"@type":114},"State and local regulations require backflow protections so the community’s potable water supply is not contaminated by unwanted reverse flow.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"What is an air gap in backflow prevention?",{"text":118,"@type":114},"An air gap is the unobstructed vertical space between a drain line and the receiving vessel, or between a freshwater supply line and the connection point to food service equipment, preventing dirty water from entering potable lines.",{"name":120,"@type":111,"acceptedAnswer":121},"Which backflow prevention device is required for food facilities with significant health hazard conditions?",{"text":122,"@type":114},"A Reduced Pressure Principle Assembly (RPPA), also known as a Reduced Pressure Zone Assembly (RPZ), is testable and designed for continuous pressure or significant human health hazards, and must be installed for domestic water supply lines for food facilities.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},495961,1791446906,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":44,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},13056703020460,"https://ap-avatar.wpscdn.com/avatar/be000253dac470eee5d?_k=1778207105932848923","Backflow Prevention in Food Establishments  \nWhy is Backflow Important?  \nState and local regulations require that food establishments meet backflow requirements to protect the potable water supply for the community. This handout is intended to provide food establishment operators with the regulatory basis for backflow prevention requirements and information on the types of backflow devices commonly found in food facilities.  \nFigure 1: Diagram depicting several causes of backflow in a potable water supply.  \nWhat Backflow Terminology is Important to Know?  \nAir Gap is the unobstructed vertical air space between the end of a drain line and the topmost part of the receiving vessel (e. g. floor sink or mop sink) that goes to the sewer system, and/or the end of a freshwater supply line and the point at which it connects to food service equipment. An air gap prevents dirty water from entering the potable water system.  \nFigure 2: Example of an air gap.  \nAtmospheric Vacuum Breaker (AVB) is a non-testable backflow prevention device designed to be used in non-continuous pressure applications that automatically vents air to prevent back siphonage into the upstream piping. AVBs must be installed at least 6 inches above the highest point of downstream piping.  \nFigure 3: (Left) AVB valve open allowing water out of faucet. (Right) AVB valve closed blocking flow of water upstream of device.  \nBackflow, also known as Backpressure or Back-Siphonage, is the unwanted flow of contaminated water in the reverse direction that can cause contamination of clean water lines.  \nFigure 4: Examples of back siphonage and back pressure.  \nBackflow Prevention Device is a device that ensures that water can only flow in one direction. There are many types of backflow prevention devices and each one works best under specific circumstances. The official University of Southern California (USC) List of Approved Backflow Prevention Assemblies can be found by visiting the USC , Foundation for Cross-Connection Control and Hydraulic Research webpage at [https://fccchr. usc.edu/list.html](https://fccchr. usc.edu/list.html).  \nFigure 5: (Left) Normal flow of water in the intended direction through a backflow prevention device. (Right) Flow of water in the reverse direction blocked by closed valves in backflow prevention device, preventing contamination of upstream water.  \nCertified Backflow Prevention Assembly Tester is a person who is certified to test assemblies for the prevention of backflow by the California/Nevada section of the American Water Works Association, the American Backflow Prevention Association or an equivalent organization approved by the State of Nevada. A list of Approved Backflow Testers in the area can be found on the Truckee Meadows Water Authority webpage at [https://tmwa.com/approved-backflow-testers/](https://tmwa.com/approved-backflow-testers/) .  \nCross-Connections are physical connections between separate piping systems in which one system contains potable water and the other contains liquid of unknown origin or questionable safety.  \nFigure 6: (Left) End of faucet is installed below rim of sink causing a direct cross-connection with the sewer system. (Right) End of faucet is  \ninstalled above rim of sink; no cross connection is present with sewer system.  \nCross-Connection Control Specialist is a person who is certified by the California/Nevada section of the American Water Works Association, the American Backflow Prevention Association or an equivalent organization approved by the State of Nevada to assure that cross-connection control programs continue to protect drinking water.  \nDual Check with Intermediate Atmospheric Vent is a non-testable backflow device that has a vent, or atmospheric port, located between two independently acting check valves. The device is intended for use in non-health hazard crossconnection and continuous pressure applications like beverage machines.  \nFigure 7: Examples of ASSE 1022 Dual Check Valves with ","cbCaiuf9QdRakBYO","https://ap.wps.com/l/cbCaiuf9QdRakBYO","pdf",1090145,"English","# Why is Backflow Important?\n## What Backflow Terminology is Important to Know?\n## Who Requires Backflow Prevention in Food Establishments?","[{\"question\":\"Why is backflow important for food establishments?\",\"answer\":\"State and local regulations require backflow protections so the community’s potable water supply is not contaminated by unwanted reverse flow.\"},{\"question\":\"What is an air gap in backflow prevention?\",\"answer\":\"An air gap is the unobstructed vertical space between a drain line and the receiving vessel, or between a freshwater supply line and the connection point to food service equipment, preventing dirty water from entering potable lines.\"},{\"question\":\"Which backflow prevention device is required for food facilities with significant health hazard conditions?\",\"answer\":\"A Reduced Pressure Principle Assembly (RPPA), also known as a Reduced Pressure Zone Assembly (RPZ), is testable and designed for continuous pressure or significant human health hazards, and must be installed for domestic water supply lines for food facilities.\"}]","Backflow Prevention in Food Establishments | PDF",1790924774,23]