A zone that keeps running after the controller says off is wasting water in real time. In Texas heat that can be thousands of gallons before anyone notices the far parkway is a swamp. This is a valve problem until proven otherwise — not a “program” problem.
This guide is written for Texas systems — coastal prairie clay in Cypress, freeze risk in Allen, watering rules from Cypress Creek MUDs. It is not a national blog with the city name swapped in. If the hardware is already failing, skip to valve repairs or call 888-427-5022.
What a sprinkler zone that will not shut off actually looks like on a Texas lawn
Water still throwing after the station LED is dark. A valve that is hot to the touch. A meter that will not settle. One zone’s heads weeping while other zones behave.
In Cypress the same symptom often traces to master-valve leaks and lake-lot overspray. In Allen we see more freeze and heave. In Georgetown (City of Georgetown) the program may be legal but the heads are wrong. Do not assume the YouTube fix matches Cypress Creek MUDs pressure.
Diagnose before you buy parts
Order of operations matters. Controller and rain sensor first, then the valve box, then heads with water on, then a shovel. Skipping steps is how people replace nozzles when the solenoid is open, or trench for a “root problem” when station 4 is dead at the clock.
- Turn the controller off entirely. If water continues, the valve is hydraulic, not a stuck program.
- Shut the irrigation isolation valve if you have one. That stops the waste while you work.
- Open the box. Look for a bleed screw cracked open, a solenoid not fully seated, or grit in the diaphragm.
- Bleed and inspect the diaphragm. A tear the size of a grain of sand is enough.
- Replace the solenoid if it will not seat or if the plunger is stuck with mineral scale — common on well and hard water.
Keep a notepad of zone numbers. The FAQ covers the phone questions we ask so the truck shows up with the right fittings.
Parts that actually last in this climate
Manufacturer diaphragms for the valve you actually have (Hunter, Rain Bird, Irritrol) beat a “universal” kit that almost fits. Keep a spare solenoid on trucks for the brands we see in each metro. Do not reuse a warped bonnet.
We use matched-precipitation nozzles when we change a head, and we flush grit after a pipe cut so the next screen does not pack. Brand-specific notes live in the blog as well — start with Low Sprinkler Water Pressure, Sprinkler Heads Misting, Underground Sprinkler Leak Detection in Texas Clay.
What it costs in Texas (ranges, not bait)
A solenoid or diaphragm on an accessible valve is a mid-range repair. A valve under a patio or a manifold of four tired valves is a different conversation. We prioritize the one actively wasting water.
A written quote before work is the rule. See Valve Repairs for what a typical visit includes, and the full service list if more than one system is involved.
DIY vs calling a licensed irrigator
You can close a bleed screw and make sure the solenoid is hand-tight. Rebuilding a valve in a flooded box without shutting irrigation water off is how people flood a garage. If the meter is spinning, shut the isolation valve and call.
Texas licenses landscape irrigators for a reason: backflow, buried electric, and municipal rules. If you are in Cypress, Allen, or Georgetown, start on the city page — Cypress, Allen, Georgetown — then book.
Mistakes that turn a one-hour job into a weekend
- Unplugging the controller and thinking the water will stop. Hydraulic valves need the solenoid to seat, not a dead clock.
- Cranking the solenoid with pliers and cracking the bonnet.
- Ignoring three other valves in the same soup of a box.
How this ties to other repairs
A stuck-on zone is an emergency if you cannot find the isolation valve. Pair this with emergency shutoff and leak detection when the wet area is not even on the zone that is running.
Coverage problems after a “fix” usually mean the program was never updated. Pair mechanical work with controller programming and, on clay, cycle-and-soak — not a longer single runtime.
What a good visit looks like on our trucks
We do not start with a parts cannon. Controller and sensor, then the box, then water-on, then dirt if the lateral is the problem. That order is how you avoid replacing a clock for a cut wire, or trenching a puddle that is eight feet from the break. If you want the short phone version, the FAQ is enough. If you want the long version, you are already in it.
Texas jobs change by metro even when the part number does not. Cypress clay hides water. Allen actually freezes brass. Georgetown bills you through a different utility window. A national blog that only swaps the city name is how Google ends up indexing one page. We write the local constraint in the article because it changes the repair.
Bring zone numbers, whether the problem is new or slow, whether anyone dug recently, and whether the meter moves when everything should be off. Those four answers route the call — leak truck vs simple head work vs controller power path. Book on contact or call 888-427-5022.
Frequently asked
Will the rain sensor stop it?
No. The valve is open hydraulically.
It stops if I tap the valve.
Scale or a sticky plunger. Replace the solenoid; tapping is not a repair.
Need it fixed, not diagnosed over email? Call 888-427-5022 or use the contact page. Same-day windows are for active leaks and stuck-on valves. Everything else we schedule on emergency vs standard priority.
Texas context we will not skip
Gulf clay, Blackland prairie, and Edwards rock do not share a repair script. A wet spot in Houston is not a freeze crack in Dallas, and a SAWS stage day is not a MUD watering window in Katy. We write those constraints because they change the parts on the truck and the program we leave on the clock.
If this article is about a part, still run isolation before you buy a case of that part. If it is about a city, still open the valve box before you trench the first damp patch. If it is about a clock, still measure the solenoid. That order is the whole business.
Call 888-427-5022. Use the contact page if you need a gate code on the ticket. Hub pages: services, service areas, blog.