Operating Rules - Chapter 11 - Cross Connections


11.01   Protection of Potable Water Quality.  Denver Water is responsible for protecting the potable public water supply from contamination or pollution that could enter the Water System through a connection from another water system or by means of backflow from a licensee’s system.

11.02   Commingling Prohibited.  Except as specifically permitted by written agreement, potable water from the Water System shall not be commingled with water from any other source.  Water from other sources shall be distributed only through an entirely independent system.  Interconnection of another source of water with Denver Water’s distribution system or a licensee’s water facilities is prohibited.

11.02.1  Dual Supply Premises.  Premises supplied with water from a non-Denver Water source will not be issued a potable service license unless the owner of such premises enters into an agreement, binding upon the owner and any successors, not to make or permit any cross?connection between any non-Denver Water source and the licensee’s service connection and water system supplied from Denver Water’s potable water distribution system.

11.02.2  Exceptions for Approved Systems.  Denver Water’s distribution system may be interconnected with an approved public potable water supply system under a written agreement between Denver Water and the owner of the approved system.

a.         Physical Connection.  The physical connection with an approved system shall be a swing connection, a removable spool, or other arrangement approved by Denver Water’s Water Quality section and must conform to the Engineering Standards.

b.         Approval Process.  To be permitted to commingle potable water, a public potable water supply system must be investigated and approved by Denver Water’s Water Quality section.  Approved systems will be monitored regularly.  The Water Quality section may withdraw approval to commingle for good cause.

c.         Backflow Prevention Device Required.  Any device connecting an approved system with Denver Water’s potable system shall have a backflow prevention device installed and maintained in compliance with the Engineering Standards.

11.03   Backflow Prevention.  Backflow from any connection into Denver Water’s potable system or the facilities of a licensee is prohibited.

11.03.1  Backflow Prevention Devices Required.  No water service connection to serve a licenses premises will be installed or maintained by Denver Water unless the potable water supply is protected from backflow as required by the Engineering Standards.  An approved backflow prevention device shall be installed on each service line within a licensee’s water system, and must be tested annually and maintained on a regular basis.  During construction, a temporary backflow prevention device may be required under Rule 3.03(c).

11.03.2  Enforcement.

a.         Inspection.  The licensee’s system will be subject to inspection by Denver Water at all reasonable times to determine whether cross-connections or other structural or sanitary hazards exist.

b.         Suspension of Service.  Water service to any premise may be discontinued if a required backflow prevention device is not installed, tested and maintained, or if a backflow prevention device has been removed or bypassed.  An unprotected cross-connection on a licensed premises may also result in suspension of service.  Service will not be restored until such conditions or defects are corrected.

c.         Procedures for Suspension of Service.  When one of the conditions described above becomes known, Denver Water will follow the procedures outlined in Rule 2.10 for suspension of water service.  The absence of a proper backflow prevention device, or the existence of an unprotected cross connection, may constitute an immediate threat of harm to the public health, safety or welfare, in which case the procedures in Rule 2.10.4 for suspension of service for emergencies may apply.