Irrigation System Repair & Installation on O'ahu
A leaking irrigation system drives up water bills and kills the plants it's supposed to feed. Our licensed plumbers repair and install residential and commercial irrigation systems on O'ahu — and handle the backflow testing required by the Honolulu Board of Water Supply.
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What We Do
Irrigation Services We Provide
From a broken sprinkler head to a complete system install — we handle every aspect of irrigation plumbing.
Irrigation Repair
Broken sprinkler heads, cracked laterals, valve failures, and controller problems — we diagnose and repair all types of irrigation system issues quickly and accurately.
Leak Detection & Line Repair
Underground irrigation line leaks waste thousands of gallons and can go undetected for months. We locate leaks precisely using pressure testing and leak detection equipment, then repair with minimal excavation.
Backflow Preventer Testing
The Honolulu Board of Water Supply requires annual backflow preventer testing on all irrigation systems. We perform certified tests and submit results to BWS — same service as our backflow services for commercial properties.
Valve & Controller Service
Irrigation control valves, solenoids, zone controllers, and timer systems. We repair and replace all valve and controller types to restore proper zone control.
New System Installation
Planning a new lawn, landscape renovation, or building new construction? We design and install irrigation systems sized for your property, water pressure, and plant types.
System Winterization & Startup
O'ahu rarely needs winterization, but irrigation systems do need periodic flushing, head adjustment, and seasonal pressure checks to maintain efficiency and avoid waste.
Don't Wait
Signs Your Irrigation System Needs Service
Water bill is higher than normal without explanation
Wet spots, puddles, or sinkholes in the yard with no rain
Some zones run fine, others don't activate
Sprinkler heads spray in wrong directions or don't pop up
Low pressure throughout the system
Backflow preventer hasn't been tested in over a year
Dead patches in the lawn despite watering
System is 10+ years old and has never been serviced
Common Questions
Frequently Asked Questions
Why does my irrigation system need a backflow preventer?
A backflow preventer stops irrigation water — which may contain fertilizer, pesticides, or soil contamination — from flowing backwards into your drinking water supply during a pressure drop. The Honolulu Board of Water Supply requires annual testing for all irrigation backflow devices. Our certified testers handle both the test and the BWS reporting.
How do I know if I have an underground irrigation leak?
Signs include unexpectedly high water bills, wet areas in your yard that don't dry out, ground settling or sinking over a buried line, and reduced pressure in the affected zone. We pressure test each zone to confirm the leak and locate it precisely before digging.
Can you add zones to an existing irrigation system?
Yes. If you've landscaped new areas or your current system doesn't cover the whole property, we can add zones by tapping into the existing supply and controller. We assess your current pressure and valve capacity before recommending additions.
How often should an irrigation system be serviced?
We recommend an annual inspection and head adjustment to make sure all zones are operating correctly and efficiently. Backflow preventer testing is required annually by the Honolulu BWS. Systems older than 10 years benefit from a more thorough evaluation of valve and line condition.
Do you install drip irrigation systems?
Yes. Drip irrigation is highly efficient for garden beds, trees, and landscaping areas where overhead spray wastes water. We design and install drip systems as standalone installations or integrated with your existing spray system.
Keep Your Irrigation System Running Efficiently
Leaking irrigation systems waste water and money. Call Alpha Omega for fast, expert irrigation service anywhere on O'ahu.