To separate an irrigation leak from a house leak, observe the water meter with all intentional use stopped, then compare carefully controlled shutoff conditions. The meter pattern, irrigation schedule, isolation valves, soggy areas, and indoor fixture checks help identify which system still uses water.
Start with a quiet-use meter test
Stop faucets, showers, laundry, dishwashing, ice making when practical, pool filling, and irrigation. Photograph or record the meter indicator and totalizer, then allow enough time to see whether movement is continuous, intermittent, or absent.
Use the house shutoff to divide the possibilities
If the meter stops when the house shutoff closes, water use is likely on the downstream house side of that valve. If it continues, the service line, irrigation takeoff, exterior branch, or another connection between the meter and shutoff remains possible. Valve location and plumbing layout matter.
Do not assume the controller is the only irrigation valve
An irrigation system may have an isolation valve, backflow assembly, master valve, zone valves, and controller. A controller set to off does not mechanically prove every valve is closed. A leaking valve can pass water without a visible spray cycle.
Look for timed and ground-level clues
Note whether meter movement matches scheduled irrigation. Walk the yard for soft soil, persistent green areas, sunken spots, valve-box water, broken heads, or runoff. The City of Frisco notes that small irrigation leaks can add up quickly and offers an official sprinkler checkup program for its residents.
Check indoor intermittent users
Toilets can refill briefly, water softeners can regenerate, reverse-osmosis systems can discharge, refrigerator ice makers can fill, and pool autofill valves can cycle. Isolate one system at a time instead of replacing parts based on the meter rhythm alone.
Document the test sequence
A useful record includes the meter reading, elapsed time, fixture status, controller status, valve positions, and what changed after each isolation step. In Frisco, Plano, Allen, McKinney, and nearby DFW communities, utility layouts and homeowner-side responsibility can differ.
Related leak-detection resources
- Running toilet or underground leak meter test
- What it means when the house shutoff stops the meter
- Water-heater leaks and high bills
- City of Frisco guidance on irrigation water waste
Frequently asked questions
Can an irrigation leak move the meter when sprinklers are off?
Yes. A passing master valve, zone valve, broken buried line, or other irrigation component can allow water use outside an active spray cycle.
Does turning the controller off isolate the irrigation system?
No. It stops programmed electrical commands but does not prove that every mechanical valve holds.
Why does the meter move and stop every few seconds?
A small valve or appliance may cycle, or the meter may register a low intermittent flow. Correlate the pattern with individual shutoffs and equipment.
Can a toilet mimic an underground leak?
Yes. A toilet can refill silently and intermittently. Dye testing and temporary fixture isolation can help identify it.
What if the meter keeps moving with the house shutoff closed?
Check the plumbing layout. Water may be flowing through a service-line leak, irrigation connection, exterior branch, or another line upstream of that shutoff.
Can wet soil identify the exact broken pipe?
It narrows the area but water can travel through soil and trenches. Location methods and controlled testing add confidence.
Should I close the city meter valve myself?
Use the homeowner-accessible shutoffs intended for operation and follow utility guidance. Do not damage or operate utility-controlled equipment without authorization.
What should I bring to a leak-location appointment?
Bring recent bills, meter photos, irrigation schedules, valve locations, repair history, and notes about when the meter moved.
Schedule Lone Star Leak Locators
For slab, pool, gas, or hidden-water leak detection in the Dallas–Fort Worth area, call or text 972-333-5448.