Cross Connection Control  and Backflow Prevention

Cross Connection Control

A cross connection is a link between a potable (drinking) water system and a non-potable water system. Contamination can occur when a water supply line to a customer is connected to equipment containing a substance not fit for drinking,creating back-flow (reversal of normal flow of a liquid solid or gas). Installation and maintenance of appropriate backflow prevention assemblies or devices prevents contamination of supply lines from cross connections.

Notice: CCC One-Time Payment – Online PAYMENTUS:  The City of Durham Cross Connection Control workgroup is pleased to offer you an easier way to pay your associated backflow and cross connection payments online using our CCC One-Time Payment – Online PAYMENTUS option.  Please go to to make a CCC online payment.  When making a payment please select the appropriate payment type and enter either your backflow permit number, building permit number for plan review, or the students name for class enrollment. Once payment has been approved you will receive a confirmation email and a copy will be sent to Your payment will be applied appropriately. 

All test and maintenance reports are to be submitted to the City of Durham electronically by email to

City Programs

CCC programs are required by the state and federal government to protect water systems from potential contamination or pollution. Staff in the CCC program implements the city’s ordinance which requires all industrial, commercial, and irrigation customers to obtain a backflow permit and install backflow prevention assemblies. These assemblies must be installed on the customer's property before any branching of the private system.
Backflow Prevention Device
Backflow Prevention Device 2
Large Backflow Preventer