Backflow Testing with a Backflow Preventer

Certified Backflow Prevention Device

The State of Tennessee requires every lawn sprinkler system installed in the state to be protected by a certified backflow preventer, backflow vale or backwater valve. These devices are required to protect the quality and safety of the drinking water supply.

What is Backflow and Why Should It Be Prevented?

Backflow is defined as the undesirable reversal of flow in a potable water distribution system as a result of a pressure differential or siphon condition that exists between two piping systems. Backflow is a problem where there is a desire to keep fluids from one piping system from re-entering another piping system as in the case of a cross-connection.

What is a Cross Connection?

A cross connection is a connection (such as a lawn irrigation system) or potential connection (such as a garden hose) between any part of a potable water system and any other environment containing other substances (such as a lawn or a container of herbicide) in a manner that under any circumstances, would allow such substances to enter the potable water system. (Other examples of common cross-connections include water supplies to heating boilers and hoses feeding utility sinks.) In other words, water that goes out a faucet, sprinkler head, or emitter should never be drawn back into the potable water system by siphon, pressure loss, or any other means.

What is a Backflow Device?

The backflow prevention device is used to keep water that passes through it, and into the irrigation system, from coming back into the water supply. Since chemicals, animal droppings, and other yard debris can contaminate water in an irrigation system, it is considered non-potable. Very strict standards have been set by the TNRCC, (the equivalent of the Environmental Protection Agency) and proper backflow prevention is required on all irrigation systems.

What Type of Backflow Protection is Required?

There are various levels of protection required for differing situations. In most parts of Tennessee, a lawn irrigation system is considered a moderate cross connection hazard to the water supply. Adding chemicals, such as fertilizers or herbicides, within the sprinkler lines is considered a high hazard cross connection.

Backflow Testing

Smart Water Irrigation & Lighting technicians are certified in the state of Tennessee to install, test and/or repair any make and model of backflow prevention device. Each calendar year your device must be tested and must pass, in accordance with your water department codes. Some water departments sub this work out themselves, while others count on residents to make sure their devices are tested and results are submitted in a timely fashion.

If you have questions about the requirements for a backflow preventer in your area, or if would like to set up an appointment to have your backflow device installed, tested and/or repaired, please contact us or call 901-382-8352 today for a consultation.

» Backflow Preventers
Reduced Pressure Principle Backflow Preventer
The Zurn Wilkins 975XL Reduced Pressure Principle Backflow Preventer provides high hazard protection for non-potable water applications. The wye pattern, bronze body provides separate access to each check valve and the relief valve for servicing.
PricePlease call for pricing
Riverbed Rock Backflow Enclosure, 48Lx20Wx30H
The Riverbed Rock Backflow Enclosure is composed of RealRock, a tough rock-like surface that easily blends in with other natural textures in your landscaping. Meets ASSE Standard 1060 Classification for Class I Freeze protection (R-8); Class II Freeze retardant; and Class III Non-Freeze protectio...
PricePlease call for pricing
Insulated Pouch 48L x 24H R-13 Green
Our Green Insulated Puch from Dekorra (48"L x 24"H) provides an R-13 value when placed over pipes to protect them from cold temperatures.  Compatible with Models 103, 104 and 114, the 603-GN provides two years UV protection when used without an enclosure.
PricePlease call for pricing
RPZ Backflow Cover
Our green RPZ Backflow Cover offers a 20-Mil Orthothalic Polyester Gelcoat with Ultraviolet Inhibitors; a 1/2" Chopped Polyresin Bonded Fiberglass; and 1" - 1-1/2" Polyurethane Spray Foam with an R-Factor Of 8. 27" x 10"W x 10"H
PricePlease call for pricing

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