What does an irrigation backflow preventer do?
Short answer: Backflow protection helps prevent water from the irrigation system from flowing backward into the potable water supply. It is a one-way device: water can flow out to your sprinklers, but it cannot flow back into the drinking water.
Backflow happens when the pressure in the water supply drops — during a water main break, a fire hydrant being used nearby, or a sudden high demand — and water that is sitting in your irrigation lines gets pulled backward toward the house and the street main. That water has been in contact with soil, fertilizer, and lawn treatments, and it does not belong in drinking water.
That is why an irrigation system is a cross-connection: a place where landscape water and the potable supply meet. The backflow preventer is the device that stands between them. The common types on residential irrigation systems in Texas are pressure vacuum breakers, double check valve assemblies, and reduced pressure principle assemblies, and the right type depends on the hazard level of the system.
A backflow preventer only protects the water supply if it is working. Its internal check valves and seals wear over time, which is why the device has to be tested — not just installed and forgotten. In Texas, backflow assemblies must be tested when they are installed, repaired, replaced, or relocated, and systems that are a health hazard must be tested at least once a year, with results sent to the local water provider. Many local water providers also require annual testing on their own.
What we check in New Caney
This is a common question in New Caney, and it is the kind of thing we test in the yard instead of guessing at from the driveway. We run the system, watch how the water is actually moving, and check the parts that cause this — before anything gets replaced. That is the same approach in the full Backflow Testing service page.
Related reading: Backflow Testing in Kingwood · All questions · Contact us
Learn more: TCEQ — Landscape Irrigator licensing (LI, IT, II) · 30 TAC Chapter 344, Landscape Irrigation — full rule text (§344.51: chemical injection requires an RPZ or air gap)
Frequently asked questions
Where is my backflow preventer?
On most homes in the Lake Houston area it is the above-ground assembly near the water meter or where the irrigation supply leaves the house — usually a brass or green-painted device with test cocks and shutoff valves on either side.
How often does a backflow preventer need to be tested?
It must be tested on installation, repair, replacement, or relocation, and at least once a year for health-hazard systems. Many local water providers require annual testing for irrigation systems regardless — check with your water provider, or call us and we will check for you.
Do you serve New Caney?
Yes. Orion’s Rain serves New Caney and the Lake Houston area — Kingwood, Atascocita, Porter, Humble, New Caney, Summerwood, Fall Creek, Huffman, and Eagle Springs. Call or text (281) 504-9998, 24 hours a day.
Related questions
- Why does a sprinkler system need backflow protection?
- Why should exposed backflow equipment be protected during a Houston freeze?
- Why should an irrigation system have its own shutoff valve?
Get it looked at
If this sounds like your yard in New Caney, call or text Orion’s Rain at (281) 504-9998 — 24 hours a day. We will test the system and tell you what is actually wrong, and what it will take to fix it the right way.
Orion’s Rain Smartscapes and Exteriors — (281) 504-9998 — LI0029444
Sources: Texas Commission on Environmental Quality, 30 TAC §344.50 and §290.44(h) (backflow testing on installation/repair/replacement/relocation; annual testing for health-hazard assemblies); San Antonio Water System, Cross-Connection Control and Backflow Prevention Program Guidelines (annual testing, licensed tester requirements).