As required by state code, the City of Mesa has a
cross-connection control program, also known as a backflow
prevention program. Backflow is the undesirable reversal of flow which
could allow water that has gone through a customer's water meter
back into the distribution system. References to residential
and commercial situations are provided in this section. For
more information about backflow, you can contact Water Quality
Services: Robert Judd at 480-644-2885 (robert.judd@Mesaaz.gov) or
Dottie Pettycrew at 480-644-4155 (dottie.pettycrew@Mesaaz.gov).
Around Your Home
Be aware of cross-connections or backflow hazards and where
they might occur. A cross-connection occurs when there is a
connection between potable (safe to drink) water and non-potable water
supplies. Properly installed and maintained backflow prevention
assemblies are critical to maintaining safe drinking water
Examples of cross-connections include:
- Garden hoses attached to the water supply that are
placed in buckets of standing water or chemicals, or in
swimming pools, pet watering bowls, or garden sprayers.
- Faucets not high enough to avoid contact with standing
water or chemicals.
- Improper height of the overflow tube in the toilet tank,
which could allow the fill valve to become submerged.
- Landscape watering systems that inter-connect City water
with an irrigation water supply.
- Unprotected landscape watering systems that can allow
water and chemicals to be drawn back into the home if a drop
in water pressure occurs.
Avoid creating the potential for a cross-connection or
backflow. Education is the greatest tool in helping to prevent
Backflow prevention assemblies should be tested for proper
operation on an annual basis. If the assembly needs repair,
have a qualified professional repair it immediately. An
assembly that is not functioning properly can be just as
hazardous as not having one at all.
A qualified plumber or backflow prevention assembly tester
can determine if the assembly is functioning properly. Make
sure their certifications and licenses are valid and current and that the individuals are recognized as
"qualified and accepted" by your local water purveyor.
When installing a backflow prevention assembly or other piece
of equipment that requires a direct connection to the potable
water supply, obtain a permit from the City to insure you meet
the minimum backflow requirements. Not all backflow prevention
assemblies meet minimum requirements.
Commercial Backflow Requirements
Obtain a permit through the Department of Development & Sustainability
(480-644-4273) prior to installing backflow protection in a commercial or
industrial setting. The Water Quality Services office maintains
list of premises requiring backflow prevention assemblies.
Potentials for cross-connection in public places:
- Fountains, including drinking fountains (if the water
nozzle or supply is below the flood rim
of the fountain.)
- Hoses attached to the potable water supply faucets and
extended into sinks, buckets, drains, chemical mixing
- Hoses should not be submerged in swimming pools or hot
- Faucets should be high enough to never come in contact
with standing water, chemicals, etc.