Backflow Prevention Device Testing
Experience has shown that there is not a mechanical device that can be
depended upon unless it is checked, tested and maintained on a regular
basis. Backflow Prevention devices are required to be installed in
specific locations to protect the safety of the drinking water. These
devices must be tested on a regular basis.
Are there any regulations regarding
backflow prevention device testing?
Yes, the State of Michigan Department of Public Health, Administrative
Rules for Michigan's Safe Drinking Water Act, Act 399, P.A. 1976 Michigan
Plumbing Code 2000, and local Cross Connection Control (CCC) plan
How often do I have my backflow prevention
All testable devices must be tested initially upon installation and
should be tested at yearly intervals thereafter. The Township inspector
may require more frequent testing based upon degree of hazard, corrosive
atmosphere or concerns with water quality.
How much will it cost to have my backflow
prevention device tested?
The cost for testing will vary depending on the size of device, the
location of the device, if the device is to be tested during normal working
hours and which testing firm will be doing the testing.
Who can test or install backflow
A certified backflow prevention device tester. This is a
professional who has successfully completed and who has proven their ability
in testing and satisfies the requirements of the Michigan Mechanical and
Plumbing Contractors Association testers course.
Where can I obtain a list of certified
Contact the Department of Public Works at 248-625-8222 for a listing of
Are all backflow prevention devices
No, the testable backflow prevention devices are:
- Double Check Valve Assembly
- Double Detector Check Valve Assembly
- Pressure Vacuum Breaker
- Reduced Pressure Backflow Preventor Assembly
- Reduced Pressure Detector Assembly
- Spill Resistant Vacuum Breaker
Will my water service be interrupted
during the test?
Yes, the water supply to the backflow preventor must be turned off during
testing. Depending upon the type of device the time for testing
typically takes 10 - 30 minutes. Additional time may be needed for
repairs, if required.
Are permits required?
Check with the building department regarding
regulations for permit requirements.
The device tester will complete a form with the necessary information
required by the water utility. This form should be copied and retained
for your records. The original should be submitted to the Department
of Public Works.
What is a backflow prevention device?
Any device that has been approved to prevent backflow into the public
drinking water supply. An approved backflow prevention device will
prevent backflow-backsiphonage and backpressure. The appropriate
device will be determined during your inspection by the CCC inspector.
How long do I have to get my backflow
prevention device tested?
The time allowed for completion of necessary corrections is determined by
your local water authority. Typically, they will mandate a timeframe.
It's true! You can pollute your own drinking water without even realizing it.
Elimination of cross connections will help protect the water we drink.
The Safe Drinking Water Act of 1974 established national standards for
drinking water. The State and Local Governments are responsible for
the enforcement of these standards, and the supervision of the public water
supply. It is the responsibility of Local Government to deliver safe
drinking water to your tap.
What is a Cross Connection?
A cross connection is a direct or potential arrangement of drinking water
piping that is or can be connected to a questionable source. An
example is the common garden hose submerged in a swimming pool. Other
examples are supply lines connected to boilers, process equipment, or
What is back-siphonage?
Back-siphonage is the reversal of normal flow in a system caused by
negative pressure (vacuum or partial vacuum) in the supply piping.
What factors can cause back-siphonage?
Back-siphonage can be created when there is stoppage of the water supply
due to repairs or breaks in the city main or increased demand at a location
such as fire fighting.
What is backpressure backflow?
Backpressure backflow is the reversal of normal flow in the system due to
downstream pressure being greater than the supply pressure.
What is the purpose of a cross connection
Under State law, each municipality is responsible to ensure that
commercial and industrial facilities within its jurisdiction are in
compliance of State requirements preventing the use of faulty cross
connections or backflow devices contained within the water system. As
a result of these mandates, the Charter Township of Independence will inspect all commercial and industrial facilities
within the city.
Questions related to a cross connection program?
Please contact the Department of Public Works at 248-625-8222.
Independence Township Signature