
ABOUT US
GMR Backflow is a local family owned backflow testing company serving San Antonio and the surrounding communities. We provide certified residential, commercial, and fire line backflow testing with accurate reporting and compliance submission to local water authorities.
Our inspections are performed by a licensed Backflow Prevention Assembly Tester and meet all TCEQ requirements. We focus on clear communication, reliable scheduling, and straightforward service so property owners can stay compliant without confusion.
As a local company, we understand the specific requirements of water authorities throughout the Greater San Antonio area and ensure every test is completed properly and documented correctly.
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SERVICES
What We Provide



A residential backflow test is an inspection of your home’s backflow preventer to ensure your drinking water is protected from contamination caused by reverse flow. The test is typically required annually and must be performed by a certified technician.
A commercial backflow test ensures a building’s potable water supply is protected from contamination caused by reverse flow. Most local water authorities require annual testing, depending on the property type and risk level. Inspections must be performed by a certified backflow tester.
A fire line backflow test inspects the backflow prevention device on a fire sprinkler system to ensure it is protecting the potable water supply from contamination. Local water authorities typically require annual testing, which must be performed by a certified backflow tester.
Schedule Backflow Testing in Your City
We proudly provide certified backflow testing in the following locations
Certified residential, commercial, and fire line backflow testing throughout San Antonio with compliant reporting and fast scheduling.
Professional residential and commercial backflow testing in Bulverde with prompt service and certified reporting.
Annual residential and commercial backflow testing in Universal City with certified inspections and electronic report submission.
Certified backflow inspection and testing services in Seguin for homes, businesses, and fire protection systems.
Commercial and fire line backflow testing in New Braunfels with certified inspections and verification of local compliance requirements.
Residential, commercial, and fire line backflow testing in Cibolo with reliable scheduling and compliant documentation.
If your city is not listed, contact us - we serve the greater San Antonio areas
What is a Backflow Test?
A backflow test is an inspection designed to ensure the backflow prevention assemblies are preventing backflow properly. Backflow occurs when water flows backward from a property into the public water supply, potentially contaminating it with harmful substances. To prevent this, backflow prevention devices, are installed in plumbing or irrigation systems.

Proud Member of the ABPA San Antonio
As a proud member of the American Backflow Prevention Association, GMR Backflow is committed to upholding the highest standards of backflow prevention and protecting the safety and health of our customers and the public. Our membership allows us to stay up-to-date with the latest industry developments, regulations, and best practices, and to connect with other professionals who share our passion for quality and excellence. We believe that our affiliation with ABPA reflects our dedication to professionalism, integrity, and continuous improvement, and we are honored to be part of such a reputable and respected organization.
Licensed through TCEQ
We are proud to be licensed by the Texas Commission on Environmental Quality (TCEQ), demonstrating our commitment to meeting the highest standards of quality and compliance in the backflow prevention industry. Our TCEQ license allows us to provide our customers with the confidence and peace of mind that they are receiving reliable and professional services from a qualified and reputable provider.
Meet Your Backflow Technician
Our growing team is a dynamic group of dedicated professionals who are passionate about providing the best backflow prevention services to our customers. With a diverse range of backgrounds and expertise, our team is committed to continuous learning and improvement.






