The Town of Prosper has established a robust cross-connection control and backflow prevention program to protect the Towns public water supply. Backflow is defined as the undesirable reversal of flow of water or mixtures of water and other liquids, gases or other substances into the distribution pipes of the potable supply of water from any source or sources. A cross-connection is the point at which a contaminated substance comes into contact with the drinking water system. In Checking for such cross-connections, the customer service inspector will also determine if there is a need for a “backflow prevention assembly”. The Purpose of a Customer Service Inspection is to identify the presence of potential sources of contamination or illegal lead plumbing materials. 

There are two types of backflow:

• Backpressure- When water pressure from a private service is higher than the pressure in the City's water system, it creates backpressure. Backpressure can be caused by a pump, elevated tank, boiler or other condition. 
• Back Siphonage - A from of backflow due to a reduction in system pressure, which causes a sub atmospheric pressure to exist in the water system.

Tester Registration

Testers are required to register annually with the Town of Prosper via email at backflow@prospertx.gov

Please submit the following: 

Domestic Line Testers

• Copy of State ID
• Copy of BPAT License
• Test gauges (updated calibration report)
• Certificate of Liability Insurance
• Confined Space Certificate

Fire Line Testers

• Same as domestic line testers
• RME and SCR
• Employment Statement Letter

*If you are licensed to perform Customer Service Inspections, please also include your CSI License and/or your plumbing license with WSPS endorsement. 

Tester Portal

Irrigation Backflow Requirement Updates

New Rule TAC 344.51 (D)

(d) If an irrigation system is designed or installed on a property that is served by an on-site sewage facility, as defined in Chapter 285 of this title (relating to On-Site Sewage Facilities), then:

(1) all irrigation piping and valves shall meet the separation distances from the On-Site Sewage Facilities system as required for a private water line in §285.91(10) of this title (relating to Tables), concerning the minimum required separation distances for on-site sewage facilities;

(2) the irrigation system is designated a health hazard and any connections using a private or public potable water source shall be connected to the water source through a reduced pressure principle backflow prevention assembly as defined in §344.50 of this title (relating to Backflow Prevention Methods); and

(3) any water from the irrigation system that is applied to the surface of the area utilized by the On-Site Sewage Facility system shall be controlled on a separate irrigation zone or zones so as to allow complete control of any irrigation to that area so that there will not be excess water that would prevent the On-Site Sewage Facilities system from operating effectively.

Rule TAC 344.52 (A)

(a) If an irrigation system is connected to a potable water supply and requires major maintenance, alteration, repair, or service, the system shall be connected to the potable water supply through an approved, properly installed backflow prevention method as defined in this title before any major maintenance, alteration, repair, or service is performed.

See additional backflow update information (PDF).

Approved backflow prevention assemblies must be installed to comply with the Town of Prosper Ordinance, State and Federal laws. Backflow prevention assemblies require testing by a registered backflow tester immediately upon installation and anytime work is performed on or upstream of the backflow assembly. Certain backflow assemblies must be tested annually by a licensed backflow tester.