Backflow Prevention

Backflow Prevention devices help to protect the City water system from pollution and contamination by providing a layer of protection at connection points to private water lines. The Prescott City Code Title II, Section 2-1-5 grants legal authority for the Cross Connection Control Program, with the adoption of the International Plumbing Code; City Code Title III, Chapter 6, Section 608, in compliance with Arizona Administrative Code R18-4-215.

The type of backflow prevention device required is dependent on the degree of hazard present. Each device must be installed according to manufacturer’s recommendations, Prescott City Code, State and Federal Regulations. A backflow device must be tested by a certified backflow tester following repairs or installation, and then annually thereafter. The City requires all testers to submit their certified test reports to the City’s Water Protection staff. All reports must remain on file for three years, pursuant to ADEQ regulations, for all backflow prevention devices within the public water system.

Certified Backflow Testers

A Breeze Fire Protection Inc928-634-8761Cornville
AERO Automatic Sprinkler Co.623-580-7800Phoenix
All West Fire Protection928-776-7861Prescott
B & W Fire Security Systems LLC928-772-8008Prescott Valley
Bear Backflow and Pressure Washing928-515-4516Prescott Valley
Benson Systems480-892-8688Gilbert
Big Sky Plumbing Inc.928-636-7370Chino Valley
Burgie’s Plumbing928-533-5652Prescott Valley
Dalmatian Fire & Safety602-620-3147Phoenix
Dave Morano928-713-1606Prescott
Life & Property Safety, LLC928-910-6213Prescott
R.E.D. Plumbing Inc.928-772-9296Prescott Valley
Titan Alarm602-680-4567Phoenix
Yavapai Plumbing & Heating928-776-7025Prescott Valley


  • Utilities
  • Ryan Osborn
  • Water Protection Specialist
  • Wastewater Collections

    1505 Sundog Ranch Rd

  • 928-777-1684


  • Yes, if these are properly installed, they will protect the potable water supply. The device shall be installed 6″ above the highest sprinkler head and shall have no control valves located downstream from the device.

  • Yes. The type of device depends on the type of fire line installed and the degree of hazard, e.g. antifreeze, pressurized, chemical, etc.

  • Backpressure backflow is created whenever the downstream pressure exceeds the supply pressure which is possible in installations such as heating systems, elevated tanks, and pressure-producing systems. An example would be a hot water space-heating boiler operating under 15-20lbs. pressure coincidental with a reduction of the city water supply below such pressure (or higher in most commercial boilers). As water tends to flow in the direction of least resistance, a backpressure backflow condition would be created and the contaminated boiler water would flow into the potable water supply.

  • Backsiphonage can be created when there is stoppage of the water supply due to nearby firefighting, repairs or breaks in city main, etc. The effect is similar to the sipping of a soda by inhaling through a straw, which induces a flow in the opposite direction.

  • This is a combined cooperative effort between plumbing and health officials, waterworks companies, property owners and certified testers to establish and administer guidelines for controlling cross-connections and implementing means to ensure their enforcement so that the public potable water supply will be protected both in the city main and within buildings. The elements of a program define the type of protection required and responsibility for the administration and enforcement. Other elements ensure continuing education programs.

  • A cross-connection is a direct arrangement of a piping line, which allows the potable water supply to be connected to a line which contains a contaminant. An example is the common garden hose attached to a sill cock with the end of the hose lying in a cesspool. Other examples are a garden hose attached to a service sink with the end of the hose submerged in a tub full of detergent, supply lines connected to bottom-fed tanks, supply lines connected to boilers.

  • The most commonly used Atmospheric Antisiphon Vacuum Breakers incorporate an atmospheric vent in combination with a check valve. Its operation depends on a supply of potable water to seal off the atmospheric vent, admitting the water to downstream equipment. If a negative pressure develops in the supply line, the loss of pressure permits the check valve to drop sealing the orifice while at the same time the vent opens admitting air to the system to break the vacuum.

  • Backpressure backflow is the reversal of normal flow in a system due to an increase in the downstream pressure above that of the supply pressure.

  • Backsiphonage is the reversal of normal flow in a system caused by a negative pressure (vacuum or partial vacuum) in the supply piping.

  • The Degree of Hazard” is a commonly used phrase utilized in cross-connection programs and is simply a determination on whether the substance in the non-potable system is toxic (health hazard) or nontoxic (non-health hazard).

  • A backflow device protects the potable water system from becoming contaminated by a flow reversal in the system.  The backwater valve protects the home or business from a blockage in the sanitary sewer system backing up into the structure.

  • Ironically, the ordinary garden hose is the most common offender as it can be easily connected to the potable water supply and used for a variety of potentially dangerous applications.

  • The device that will be required depends on the degree of hazard. Contact City of Prescott Water Protection for a consultation or an inspection to determine the device that is required.

  • City of Prescott Water Protection

    1505 Sundog Ranch Road

    Prescott, AZ, 86301


    Fax: 928-777-2482

  • The backflow device must be installed on the service side of the water meter.  Any variance from this requirement needs to be approved by City of Prescott Water Protection.

  • A Certified Backflow Tester, such as ABPA, PIPE or other  certified tester that has supplied all required documentation on test kit certification and company information to the City’s Water Protection staff.

  • The home or business property owner is ultimately responsible but it is an industry standard that the Certified Tester/Company sends them to the City.


Covid-19 Vaccine Clinic

Posted on January 11, 2022

Tuesday, January 25 1 pm – 3 pm Founders Suite on the 1st floor at Prescott Public Library Yavapai County Community Health Services (YCCHS) will be on site to provide COVID-19 Moderna 1st and 2nd dose vaccines and boosters. Please… Read more »

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