A brown strip beside a green lawn, water running down a driveway, or a utility bill that jumps without warning usually points to one thing: the irrigation system needs attention. This guide to irrigation water audits gives property owners a practical way to identify waste, coverage problems, and equipment issues before they become larger repair costs.
An irrigation water audit is a field check of how a sprinkler system applies water. It looks beyond whether the zones turn on. The goal is to determine whether water is reaching the intended landscape evenly, at the right rate, and without avoidable runoff, leaks, or overspray.
What an Irrigation Water Audit Checks
A working system is not always an efficient system. A zone can activate on schedule while still watering the sidewalk, flooding one corner of a bed, or leaving turf dry near the edges. An audit connects what you see in the landscape with the equipment and programming causing it.
The inspection normally begins with the visible system components: sprinkler heads, nozzles, valves, pipes, drip lines, backflow equipment, and the controller. Each zone is run long enough to observe spray patterns, pressure, drainage, and any water that appears where it should not.
The audit also considers the landscape itself. Turf, trees, shrubs, groundcover, and planting beds do not have the same watering needs. A single schedule for every zone can waste water or stress plants, especially when sun exposure and soil conditions vary across the property.
Start With the Controller and Watering Schedule
Before adjusting heads or replacing parts, review the controller. Check the current day, time, start times, run times, and watering days. Many properties have schedules that were set years ago and never changed after seasonal weather shifts, landscape changes, or equipment repairs.
Look for duplicate start times. If a controller has three start times programmed for a program, it may run every zone three times. Property owners sometimes use extra start times to handle dry areas, when the real issue is poor coverage or compacted soil.
Run times should reflect the zone type. Rotary sprinklers generally apply water more slowly than fixed spray heads, while drip irrigation works differently from both. A schedule that makes sense for one zone may cause runoff or standing water in another.
Seasonal adjustment is another common issue. Watering needs often drop in cooler months and rise during hot, dry periods. If the controller has a seasonal adjust feature, use it carefully. It changes all programmed run times by a percentage, so it is useful only when the base schedule is already sound.
Inspect Every Zone While It Runs
Walk the property one zone at a time. Start at the valve box or controller so you know which area you are evaluating. Let the zone run long enough to reveal its actual performance, not just a quick burst from each head.
Watch for a broken head, a missing nozzle, a head that does not rise fully, or a stream of water from the side of a riser. These problems are often easy to spot, but they can waste a surprising amount of water during repeated cycles.
Then check whether each sprinkler is aimed correctly. Heads should serve the landscape, not pavement, fences, walls, windows, or parked vehicles. A head that has shifted after mowing, foot traffic, or settling soil may need simple alignment. A head installed in the wrong location may require relocation or a different nozzle.
Pressure problems deserve close attention. Excess pressure can create a fine mist that blows away before reaching the ground. Low pressure can leave short throw distances and dry areas between heads. Pressure can change by zone, so do not assume one good-looking area means the full system is operating correctly.
Measure Coverage, Not Just Equipment Condition
The most useful part of a water audit is confirming how evenly the system applies water. A sprinkler pattern may look acceptable from a distance, yet still leave dry sections that force longer run times.
A simple catch-can test helps reveal this. Place identical straight-sided containers across the irrigated area, including near heads, between heads, and at the edges. Run the zone for a set time, then measure the water collected in each container. Large differences show uneven distribution.
You do not need laboratory-level precision to find obvious problems. If one container is nearly full and another is barely wet, the zone needs correction. Common causes include mismatched nozzles, clogged nozzles, improper spacing, blocked spray patterns, poor pressure, or heads that are too low for surrounding grass or plants.
For larger properties, a professional evaluation can provide more detailed measurements and recommendations. This is especially useful when water costs are high, multiple zones have recurring dry spots, or the system serves mixed landscaping with turf, beds, and drip irrigation.
Check for Leaks, Runoff, and Hidden Water Loss
Some water loss is dramatic, such as a geyser from a broken line. Other losses are quieter. A valve that does not close fully may allow water to seep from the lowest sprinkler head after a zone shuts off. A slow underground leak may show up as soggy soil, unexplained green growth, or a wet area that persists between watering days.
Runoff is not always a sign of a leak. It can mean the soil cannot absorb water as quickly as the zone applies it. Sloped ground, clay-heavy soil, compacted turf, and long run times can all send water toward sidewalks, curbs, and storm drains.
When runoff is the issue, shorter cycle-and-soak watering may help. For example, instead of running a spray zone for 20 minutes at once, the controller may run two 10-minute cycles with time between them for water to soak in. This is not a universal fix. If heads are over-pressurized or the zone is applying too much water, equipment changes may still be needed.
Also inspect drip zones closely. Drip irrigation can be efficient, but damaged tubing, disconnected emitters, pinched lines, and buried leaks are easy to miss. Check that emitters are positioned near plant root zones and that water is not pooling at one plant while another receives little or none.
Record What You Find Before Making Changes
A clear record helps prevent guesswork and makes it easier to compare system performance after repairs. For each zone, note the area served, the head or emitter type, the current run time, visible defects, and whether coverage appears even.
Include observations such as:
- Water spraying onto pavement or structures
- Dry spots, pooling, runoff, or erosion
- Broken, sunken, tilted, or clogged sprinkler heads
- Zones with weak pressure or excessive misting
- Controller settings that do not match the season or landscape
Prioritize Repairs That Stop Waste First
Not every audit finding needs the same response. A cracked head that sends water across a driveway should be repaired promptly. A dry area caused by one obstructed head may need trimming and adjustment. A broad coverage problem across an older system may call for a planned upgrade rather than repeated small fixes.
Start with active leaks, broken components, stuck valves, and severe overspray. These issues can waste water immediately and may cause property damage. Next, address poor coverage and pressure concerns that are forcing longer run times. After that, refine scheduling based on plant needs, weather, and local watering requirements.
There are trade-offs. Reducing run time may lower water use, but it will not solve a zone that misses part of the lawn. Replacing every head may not be necessary when the problem is a few mismatched nozzles. A professional assessment helps separate a targeted repair from a system-wide issue.
When to Call an Irrigation Professional
Call for service when you see recurring leaks, unexplained wet areas, low pressure across multiple zones, valve failures, controller problems, or widespread uneven coverage. It also makes sense to bring in a professional before replacing a controller or changing major equipment. New technology cannot correct pipe damage, poor zone design, or incorrect pressure on its own.
For landlords and property managers, an audit is also a practical way to document conditions before seasonal maintenance, tenant turnover, or landscape work. It provides a clearer basis for approving repairs and setting expectations for water use.
ASM Irrigation provides same-day consultations and estimates for irrigation repairs and installations, helping property owners move from a visible problem to a defined solution without unnecessary delay.
A water audit does not need to be complicated to be useful. Run each zone, watch where the water goes, compare that result to what the landscape needs, and act on the problems that are costing water or putting plants at risk. A timely repair now can protect the property through the next stretch of hot, dry weather.