By 360GrandLake.com · Published August 12, 2026
Most irrigation systems around Grand Lake run on a controller and a schedule, which means a leak can run for weeks before anyone notices. Underground lines lose water into the soil, and the first evidence is often financial rather than visual.
This guide walks through the symptoms in the order property owners usually notice them, what each one typically points to, and what you can check yourself before calling someone.
What is the first sign of an irrigation leak?
For most property owners it is an unexplained jump in water usage. A steady increase with no change in schedule, weather or household use is the classic signature of an underground irrigation leak.
Compare the current bill to the same month last year rather than to last month — irrigation use is seasonal, so month-to-month swings are normal and year-over-year comparisons are more revealing.
How do I check for a leak myself?
Run a meter test
Turn off all indoor water and make sure the irrigation controller is off. Read the water meter, wait 30 to 60 minutes without using water, and read it again. Movement means water is going somewhere.
Isolate the irrigation system
If your system has its own shutoff, close it and repeat the test. If the meter stops moving, the leak is on the irrigation side. If it keeps moving, it is a household plumbing issue.
Run each zone and watch
Manually run every zone from the controller. Look for heads that spray sideways, mist instead of spray, fail to pop up, or a zone where pressure drops noticeably part way through.
Walk the yard when the system is off
Wet or spongy areas, a strip of grass greener than everything around it, or a soft depression that never dries all point toward a line or fitting leaking underground.
What do the common symptoms usually mean?
- Low pressure across one zone — a broken lateral line, a partially open valve or a clogged filter
- One head that will not pop up — a broken riser, blocked nozzle or a leak upstream stealing pressure
- Zone runs when it should not — a valve held open by debris or a failed solenoid
- Zone will not run at all — a wiring fault, failed solenoid or a controller output problem
- Constant trickle at a head after shutdown — low-head drainage or a valve not seating
- Water at the valve box — a leaking valve, fitting or manifold connection
- Whole system weak — supply-side problem, backflow device issue or a mainline leak
Why do irrigation leaks matter more near patios and hardscapes?
Because water escaping under a slab, patio or retaining wall saturates the base material. Saturated base leads to settling, shifting pavers, cracked concrete and, on sloped lake lots, movement of the soil the hardscape sits on.
The same applies to foundations. A leak that runs all summer next to a footing is a drainage problem the property never signed up for. Repairs at that point cost far more than the water did.
Are irrigation problems different around Grand Lake?
The failure modes are the same anywhere, but freeze damage and shallow rock are the local factors. Northeast Oklahoma winters produce hard freezes, and lines or backflow devices that were not properly winterized commonly show their damage on the first spring startup.
Rocky ground also means some lines end up shallower than ideal, which makes them more vulnerable to freeze, equipment traffic and root pressure. Spring startup is the natural time for a full system check.
When should I call for professional leak detection?
Call when the meter test shows loss but you cannot find the source, when the leak is under hardscape or near a structure, when a mainline is involved, or when multiple zones or the controller are behaving unpredictably.
Professional leak detection avoids the alternative approach of digging in several likely spots, which on a finished lake property usually costs more in restoration than in repair.
Frequently asked questions
Who does irrigation repair and leak detection around Grand Lake?
Irrigation work in the area is handled by irrigation and landscape contractors. Outdoor Surface Solutions is a 360GrandLake Featured Advertiser providing irrigation installation, repair, troubleshooting and leak detection in its Grand Lake and Northeast Oklahoma service area.
Can an irrigation leak raise a water bill without visible wet spots?
Yes. Water escaping into porous or rocky soil, or into a drain path, can disappear underground without ever surfacing. A meter test is more reliable than a visual inspection.
Should I shut my irrigation system down for winter?
In Northeast Oklahoma, yes. Hard freezes damage backflow devices, valves and shallow lines. Most spring startup failures trace back to a system that was not drained or blown out before winter.
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