Backflow Prevention & Testing

Backflow Prevention & Testing Requirements

To protect our community’s drinking water, the Texas Commission on Environmental Quality (TCEQ) requires all public water systems and customers to help prevent contamination through backflow prevention assemblies (BPAs).

What is Backflow?

Backflow happens when water flows backward into the public water supply, potentially carrying contaminants like fertilizers, chemicals, or bacteria.
Backflow prevention assemblies (like double-check valves or reduced pressure zone assemblies) stop this from happening.

Who Needs a Backflow Device?

Any home or business that poses a potential contamination risk, such as irrigation systems, fire sprinkler systems, or commercial operations, must have an approved backflow prevention assembly.

Testing Requirements

• All backflow prevention assemblies must be tested when first installed.
• Assemblies that protect against health hazards must be tested every year after installation.
• Testing must be done by a TCEQ-licensed Backflow Prevention Assembly Tester (BPAT).
• Test results must be reported to the local water provider using TCEQ Form 20700 (Backflow Prevention Assembly Test & Maintenance Report).
• All test results must be submitted by a TCEQ-licensed Backflow Prevention Assembly Tester to BSI Online. 

Submit a Backflow Report

Backflow Test Form
Home - BSI Online

For technical issues or questions regarding uploading reports, please contact BSIonline@backflow.com.

For questions regarding compliance or to confirm test submittal, please contact the Public Works office at 210-658-5364 ext. 609.