Frequently Asked Questions
What is a backflow prevention program?
It is a progressive program required by the State of Florida since 1977, to detect and prevent possible sources of non-drinking water from entering the public utility drinking water system. Beginning in 2003, the Florida Department of Environmental Protection has required all providers of public drinking water to implement these programs.
What is a backflow?
Backflow is the backward flow of water through a pipe. The normal direction of water flow is from the utility water main into homes or businesses. The backflow of water from home plumbing systems into the community drinking water supply happens when water is pulled backward due to a pressure loss in the utility main pipe or pushed back by a pressure source like a well pump.
Back siphonage creates a vacuum as water drains toward the community water system. Water or fluid can be siphoned or pulled into the utility main water line. Example: a garden hose with one end immersed in a pail of soapy water or a hose immersed in a swimming pool.
Why are backflow preventers needed?
Backflow preventers are designed and installed to prevent the flow of water backwards through a pipe. Two commonly required backflow preventers are the Double Check Valve Assembly (DC) and the Reduced Pressure Zone Assembly (RP). Both of these protect the public utility drinking water system from backflow created by back siphonage and back-pressure.
The RP backflow preventer is used to protect against potential health hazards such as sewage, medical fluids, and chemicals.
The DC backflow preventer is used to protect the utility system from non-health hazards such as odor, color and taste. These include well water, swimming pool water or nontoxic industrial fluids such as dye or food products.
Who needs a backflow preventer?
Backflow preventers will be required if there exists an actual or potential hazard for a cross-connection. Some of these hazards include:
- Commercial and residential irrigation systems
- Fire sprinkler systems
- Medical facilities
- Processing plants
- Well, lake and reclaimed water sources
Why do backflow preventers need to be tested every year?
The backflow preventer is a mechanical device that needs maintenance just like a car. The annual test indicates if the parts are working properly to protect your water supply.
Why does this backflow preventer need to be installed in the front of my house?
To protect the community water system as much as possible and meet state requirements, the backflow preventer needs to be installed as close to the water meter as possible.
My backflow preventer sometimes leaks water from a relief valve. Can I remove or plug the valve to prevent water loss?
The relief valve is designed to discharge water from the region between the two check valves in order to keep the water pressure in that region at least two pounds per square inch (psi) less than the supply pressure — the pressure upstream of the number one check valve. Plugging or removing the relief valve, however, could cause damage to the check valves or to your plumbing.
Can I cover or hide the backflow preventer?
Yes, you may cover and protect the backflow prevention assembly from weather, vandals and lawn equipment. However, access to the backflow prevention assembly for the annual testing must be provided. Manatee County requires a minimum clearance of three feet from landscaping plants to the edge of the concrete slab, if any, and clear opening for access from the street. (Download Manatee County Specifications for Backflow Installation)