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This document serves as a checklist and application form for obtaining a permit to install or update backflow preventors in buildings serviced by the City of Bothell Water Department. It outlines
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How to fill out Backflow Prevention

01
Gather necessary materials: Backflow prevention device, permits if required, and tools.
02
Identify the location where the backflow preventer will be installed.
03
Shut off the water supply to the area where the device will be installed.
04
Follow the manufacturer's instructions to install the backflow prevention device properly.
05
Connect the device to the water supply line, ensuring all fittings are secure.
06
Test the device to ensure it is functioning correctly.
07
Restore water supply and check for any leaks or issues.
08
Schedule regular maintenance and testing as required by local regulations.

Who needs Backflow Prevention?

01
Property owners with irrigation systems.
02
Commercial buildings with potable water systems.
03
Industrial facilities handling hazardous materials.
04
Swimming pools and hot tubs.
05
Restaurants and food service establishments.
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Types of Backflow Devices These are the four most common types of backflow prevention methods/devices: Air Gap Separation (AG) An AG is a physical separation between the supply pipe (or faucet) and the flood level rim of its receptacle. Pressure Vacuum Breaker (PVB) Double Check (DC) Valve. Reduce Pressure (RP) Valve.
The main difference between the two devices is the level of protection they provide. While PVBs are sufficient for most residential and small commercial irrigation systems, RPZ provides a higher level of protection and is typically required for larger, more complex plumbing systems.
Backflow and Back Siphonage There are six basic types of devices that can be used to correct cross- connections: air gaps, barometric loops, vacuum breakers — both atmospheric and pressure-type, double-check with intermediate atmospheric vent, double-check valve assemblies, and reduced pres- sure principle devices.
This serves to protect you and your home, keeping your drinking, bathing, and cleaning water safe. Backflow prevention systems are devices installed onto a pipe that only allow water to flow in one direction.

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Backflow Prevention is a method used to prevent contaminated water from flowing back into the clean water supply, ensuring the safety and quality of drinking water.
Property owners, plumbing contractors, and businesses that have potential cross-connections in their water supply systems are typically required to file Backflow Prevention.
To fill out Backflow Prevention forms, one must provide details about the property, the type of drinking water system, the type of backflow prevention device installed, and compliance testing results.
The purpose of Backflow Prevention is to protect public health by keeping the drinking water supply free from contaminants that may enter through backflow.
Information that must be reported includes the location of the backflow prevention device, testing and maintenance records, and any incidents of backflow events.
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