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Backflow Prevention and Cross Connection Control Program

As part of Coastside County Water District’s commitment to delivering safe, reliable, high quality water to our customers, the District maintains an effective Backflow Prevention and Cross Connection Control Program. This program is designed to protect the District’s potable water supply from the possibility of contamination from backflow and to promote the control of existing cross connections.

This program is implemented in accordance with the requirements of the California Administrative Code Title 17, and was implemented by the District in 2001 and revised in 2004 and 2013 (see Ordinance No. 2013-01).

Installation of Approved Backflow Prevention Devices

If you are a Coastside County Water District customer who meets the requirements for the installation of a backflow prevention device on your water service, we want to make the process as easy as possible for you.  The following information should assist you with the process:

  • Where are the devices installed?
    The devices are installed on water service lines.  Typically the backflow device is installed at the property line directly after the water meter.
  • Who can install the devices?
    A licensed contractor, plumber, backflow professional, or the property owner can install the devices.
  • Backflow Prevention Device Installation/Testing Information
  • Compliance Requirements
    After the initial installation, inspection, and testing of the backflow prevention device, the customer must:
    • Maintain the privately owned backflow prevention device
    • Submit annual test results to CCWD.  You will receive a reminder, including a test report form and current list of certified backflow prevention device testers on an annual basis from Coastside County Water District.

Requirements for Backflow Prevention Assemblies

Existing service connections – Unless otherwise specified by the District, a backflow prevention assembly must be installed on all existing non-residential service connections and on residential service connections that have an auxiliary water supply, a cross connection, a storage tank or other risk of backflow contamination by March 31, 2014.

Single-family, duplex, and triplex water services that serve structures fewer than three stories tall with no health threats, auxiliary water supply, or additional water service connections are typically exempt from a backflow prevention assembly. Single-family service connections, master metered duplexes and master metered triplexes qualify for a single check, non-testable device to be installed as part of the District’s meter change out program, unless otherwise specified by the District.

New service connections – A backflow prevention assembly must be installed on all new Non-Single Family Residential Services and all new Single Family Residential water service connections that have an auxiliary water supply, a cross connection, or a risk of backflow contamination.  At the time an application for a new water service is made by a potential customer in accordance with procedures established by the District, the General Manager will review the application to determine the need for an approved backflow prevention assembly on the customer’s service.  If a backflow prevention assembly is not required, a single check will be installed on the downstream end of the water meter.

What is Backflow?

Backflow means the reverse flow of water or any other fluid or substance or any combination or any mixture thereof from the customer’s system into the District’s water distribution system.

What is Cross Connection?

Cross Connection means any connection, link, or channel between the District’s water distribution system and an auxiliary water supply, a pipe or piping system, plumbing fixtures, appliance, container, receptacle, vessel or other devices that may allow for contaminated or used water or fluid, or any other substance of whatsoever nature other than the water supplied by the District, to enter any part of the District’s water distribution system.

Backflow Prevention Assembly Device

The installation of a backflow prevention assembly device will protect the District’s water system from possible contamination.  The assembly must be of a type and manufacture approved by the District, which will prevent backflow into the District’s distribution system.  The District will approve all backflow prevention assemblies that meet the American Water Works Association (AWWA) standards at the time the backflow prevention assembly is installed.  Assemblies include:

  • Reduced Pressure Principle Backflow Prevention Device (RP) – means a device incorporating two or more check valves and an automatically operating differential relief valve located between the two checks, a tightly closing shut-off valve on each side of the check valve assembly, and with necessary test cocks for testing.
    Reduced Pressure Principle Backflow Prevention Device (RP)