Backflow Testing and Certifications - Competitive Irrigation

Backflow Testing and Certifications

All Municipalities that require Backflow Prevention devices on commercial and residential water, fire, and irrigation systems have to be tested and certifed on a yearly basis. Our expert team at Competitive Plumbing & Irrigation have the required certification in Backflow Prevention and test all types and sizes of backflow devices. Suspect you may have a backflow problem? Call Competitive Plumbing & Irrigation, your Satellite Beach backflow specialists today at 321-243-0363 to schedule an appointment with our friendly, knowledgeable staff to identify the issue and make any necessary repairs/adjustments right away, so you can get back to your routine with the least disruption possible, and avoid any dangerous contaminants from potentially polluting your drinking water.

Benefits of Our Services

  • Annual Backflow Testing
  • Fill Out Municipality Backflow Test Sheet
  • Send Paperwork Into the Proper Municipality

Why Does Backlfow Occur?

Backflow occurs for one of two reasons, either due to back pressure or to back “siphonage”.

  1. Back pressure is the result of a higher pressure in the system than in its supply, i.e. the system pressure has been increased by some means. This usually occurs in unvented heating systems, where thermal expansion increases the pressure.
  2. Back siphonage is the result of supply pressure being lowered below that of the system. This occurs when a supply is interrupted or drained down.

Importance of Proper Prevention

Backflow prevention must be automatic, and so manual valves are not usually acceptable. The precise measures required to prevent backflow depend on the risk of contamination, i.e. the condition of the water in the connected system.

This is categorized into the following different risk levels:

  • Category 1: No risk. Potable water
  • Category 2: Aesthetic quality affected, e.g. water may have been heated
  • Category 3: Slight hazard from substances of low toxicity, e.g. cold water storage tanks
  • Category 4: Significant hazard, e.g. pesticides
  • Category 5: Serious health risk, e.g. human waste

Check Valves

Automatic check valves are required to prevent back pressure. Regulations for these check valves specify the design capabilities of the valve used, according to the hazard. Category 2 contamination may be prevented by a single check valve, but category 3 requires a double check valve (these are maunfactured as a convenient single unit, or even integrated into tap (faucet) fittings). Category 5 requires an air gap, not merely a valve. A recent introduction of the new Reduced Pressure Zone (RPZ) valve, a form of double check valve where the intervening zone is drained and normally kept empty.  If the downstream valve leaks and permits backflow, this will drain out through the vent rather than building up pressure against the upstream valve. These valves are complex, requiring certified installation and annual checks. They are used for category 4 systems, such as fire sprinklers where the system has an antifreeze additive.

 Air Gaps

Back siphonage may be prevented by use of an air gap. This may be a small gap, such as provided by a tundish (a combined overflow spout and catch funnel) or a large gap, such as a basin tap being above the maximum level of the water in the basin. Standards for these air gaps group them by the amount of separation that they provide and their acceptability for the various risk categories. The size of the acceptable gap also depends on the capacity of the incoming supply, such that a stuck-open flow cannot overfill the cistern and close the gap.

Air gaps may also protect against back pressure and are generally favoured for this. However most air gaps also limit the system pressure that may be transmitted across them. In most cases they replace main pressure with the pressure of that from a raised gravity cistern.


Washbasins are cold water cisterns where the float valve outlet must be above the overflow water level. The previous practice of taking a “silencing tube” from the float valve to under the water level is no longer acceptable. Such silencing may be acceptable if it is a soft collapsible tube, as this cannot syphon.Hand-held showers must have their hoses fastened such that the shower head cannot rest below the water level in a bath or basin.

Notice a problem with your Backflow system or time for regular testing? Call Competitive Plumbing & Irrigation, your Satellite Beach backflow specialists today at 321-243-0363 to schedule an appointment.