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
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
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
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.