Preventing cross connections between auxiliary and drinking water systems is important to protect the health and safety of all entire public water system users. City, state, and federal regulations apply to auxiliary water sources used with drinking water service because they may not meet drinking water standards.

Auxiliary water is any water, except drinking water, or a mixture of water and anything else from any source that is pressurized for use, treatment, or disposal on or available to a site served by Austin Water. This includes, but is not limited to:

There is greater concern over possible cross connections now that auxiliary water systems increasingly involve pressurized plumbing systems that can contaminate large volumes of water. Cross connection prevention has three main goals:

  1. Ensure that the auxiliary water system is not connected to the drinking water system from the start.
  2. Make sure that the public water system is adequately protected by approved and regularly-maintained backflow prevention assembly(ies) at water service meter(s) to any site using an auxiliary water system.
  3. Periodically verify that auxiliary and potable water systems remain segregated, and all required safeguards are working properly.

Certificate of Occupancy

A Certificate of Occupancy is required to install and use reclaimed or other auxiliary water sources (see Plan Review Process for more information).

Annual Inspections

After service is reviewed, inspected and approved, a Customer Service Inspection (CSI) is required annually. These inspections must be conducted using qualified Customer Service Inspectors registered with the City of Austin (see Eligibility Requirements for Customer Service Inspectors and List of Registered Inspectors).

CSI procedures are based on the adopted version of Chapter 16 of the 2009 Uniform Plumbing Code. Should an inspection uncover a cross connection, all City of Austin water services provided for this site shall be immediately terminated. Water service will not be reinstated until all necessary repairs are complete. Regardless of the CSI test results, a complete inspection form [see form, Figure: 30 TAC § 290.47 (d)] indicating the facility’s status must submitted to the Special Services Division by the annual due date to remain in compliance.