Is the leak always under the wet spot?

No. Water can travel along a pipe trench, across a hard soil layer or under rock mulch and surface several feet from the break. Mark the wet area, note when it appears, and have the line traced before digging, since other utilities may share the ground.

Does a high water bill prove an irrigation leak?

Not by itself. A hotter month, a longer program, a new planting schedule and a leak can all raise use. Compare the billing period with controller changes, then do a meter check with every station off. A moving meter with everything off is stronger evidence than the bill.

Irrigation Leak Detection

Trace soggy ground, weak zones and unexplained water use back to the pipe, fitting or valve that is losing water.

Request an estimate(623) 292-2515

Leaks hide well in Surprise yards

Rock mulch, block walls and hard desert soil all help an irrigation leak stay out of sight. Water from a cracked lateral can run along the trench, spread over a caliche layer and surface several feet away, or vanish under decomposed granite and show only as one shrub that looks greener than the rest. University of Arizona Cooperative Extension notes that caliche restricts water movement and can leave water perched above it, which is exactly how a leak travels sideways.

Surprise gives some owners a head start. City of Surprise water customers can watch their use and set leak alerts in the city's WaterSmart portal, and the city has been replacing about 16,000 mechanical meters, including irrigation meters, with automated ones. Customers of EPCOR or one of the other providers inside the city use that provider's tools instead.

From timing to the break

The search runs on timing. Ground that goes soft only while one station runs points at that station's pipe or a head fitting. Water that keeps appearing with every station off points upstream to a valve that will not seal or the pressurized mainline. EPA WaterSense treats pooling between cycles as a sign of an underground leak. The meter is read with all stations off, suspect stations are compared for head pressure, and soil is probed before anyone digs.

Surprise's water conservation ordinance asks the person responsible for a property to begin repairing a known leak no later than 72 hours after learning of it and prohibits letting water escape once it should have been noticed. If water reaches a foundation, electrical box or walkway, shut the irrigation supply if it is safe and keep clear of wet equipment. Related pages: PVC pipe and mainline repair and valve and solenoid repair.

Source: City of Surprise, Drought Resiliency and Preparedness, Checked Oct 1, 2026