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Double Check Cross-connection device


The Town of Denton has begun their inspection, implementation and enforcement of their Cross-connection Control Ordinance. In the immediate future, you may receive a letter requesting a meeting to inspect your property for possible cross-connection hazards. Your assistance and consideration is appreciated. If you have any questions about the Town of Denton Policy, Ordinance or inspections, please contact Town Hall at 859-4231, Mr. Troy Branch 859-4460 or Mr. Michael High at 859-5885.

Some of the hazards we will be looking at include:

  • Irrigation Systems
  • Fire Sprinkler systems
  • Medical facilities
  • Processing plants
  • Well, lake, ponds and reclaimed water sources

Two commonly required backflow prevention devices are the Double Check Valve Assemblies (DC) and the Reduced Pressure Zone Assembly (RPZ). Both of these protect your public utility drinking water system from backflow created by backpressure and backsiphonage.

The double check or DC 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.

The Reduced Pressure Zone assembly or RPZ is used for potential hazards such as sewage, medical fluids, and chemicals.

The selection of a backflow prevention device is based upon several factors. However, backflow prevention devices are required if there exists an actual or potential hazard for cross-connection


Backflow/Cross-Connection Prevention Frequently Asked Questions

What is a Cross Connection?

A cross connection is any link between potable (drinking) water and any other substance not intended for human consumption.

What is Backflow?

A backflow is the reversal of the normal flow of any substance back into the potable water system which could cause contamination.

What can cause a backflow condition?

A backflow condition condition can happen in many ways. Some common causes include loss of pressure in the water supply from water use at a nearby fire, a broken water main, or backpressure from an elevated plumbing fixture, fire sprinkler or lawn sprinkler.

What is Backpressure?

Backflow resulting from pressure greater than the public water supply pressure.

What is Backsiphonage?

Backflow resulting from negative pressures in the distribution pipes of a public water supply.

Who is directly affected by this?

The customers affected will be all new and existing Industrial facilities as well as some new and existing Commercial facilities (depending on their hazard level). Residential connections will not be affected at this time unless a known hazard exist i.e. hot tub, plumbed pool, pond, or a well that is still cooected to residence.

Why do we have to implement this program?

This program will protect the Town's water system from contamination and also will protect you from liability resulting from an incident. In addition, the North Carolina Department of Environment and Natural Resources requiresevery water provider to implement a program and enforce it to ensure safe drinking water to each and every water customer.

What is a Backflow Preventer?

A backflow preventer is a mechanism or a means to prevent backflows from occuring by creating a physical barrier or eliminating cross connections.

Does a Backflow Preventer require regular maintenance?

Yes. Backflow preventers have internal seals, springs, and moving parts that are subject to wear or fatigue. A visual check of an airgap is sufficient but mechanical backflow preventers require annual testing. The customer is responsible for any testing repairs or maintenance.

Who is certified to do the testing and repairs on the Backflow Preventer?

The testing must be done by a certified tester, the certification can be obtained through the American Water Works association (AWWA) or the American Backflow Preventer Association (ABPA). The repairs and installation can be done by a Licensed Plumber.

: Cross-Connection Control Ordinance

: Approved Tester List


Town of Denton