Backflow Testing


The Texas Commission on Environmental Quality (TCEQ), which is one of the regulatory agencies governing Markout WSC, requires that the public water supply be protected from outside contamination. To ensure this protection, Markout WSC requires a testable dual check valve assembly or a reduced pressure zone assembly on all landscape irrigation systems. Any new sprinkler system that is installed on a property where there is also a sewer system onsite (i.e.:  aerobic or septic system) must be installed with a reduced pressure zone device.  These devices are to be tested upon installation by a TCEQ Licensed Backflow Inspector and a copy of the test provided to the Markout WSC office.  It is the policy of Markout WSC to require annual testing of the regular back-flow assemblies and reduced pressure zone devices to help prevent contamination of the water supply.  Notices with backflow test due dates are mailed to the billing address on file.  THESE TESTS ARE NOT REQUIRED ON SEPTIC SPRINKLERS.


A list of certified backflow testers is available under the "Documents" section of this website. If you decide to use a tester other than those listed, please include a copy of their BPAT license along with your test results. Below is an approved TCEQ form, which the tester will complete and then forward to our office by your inspection due date.

REMINDER: The deadline for the tests to be performed and results sent to our office is listed in the notice that was mailed to you.  Failure to have the test done and results sent to our office will result in disconnection of service.  All applicable disconnect and reconnect fees will apply if service is disconnected.