A professional irrigation system inspection reveals hidden leaks, pressure problems, and aging components that waste water and money before they become expensive failures. Whether you're buying a home with established landscaping or maintaining your current system, knowing what happens during an inspection helps you make informed decisions. This guide walks you through the complete process so you understand what inspectors look for and why it matters.
Why Irrigation Inspections Matter
Irrigation systems operate underground and behind walls, making problems invisible until damage spreads. A professional inspection catches issues early—a single leaking zone can waste 6,000+ gallons monthly, inflating water bills by $30–$50 per month. Inspectors identify timer malfunctions, corroded valves, broken sprinkheads, and pressure imbalances that compromise coverage and plant health. Regular inspections every 1–2 years extend system lifespan and prevent emergency repairs that typically cost 3–5 times more than preventive maintenance.
What Happens During a Standard Inspection
Initial System Assessment
The inspector begins by documenting your system's layout, age, and components. They'll review your controller settings, timer programming, and valve configuration. If you have documentation (blueprints, installation records), have those ready—they save time and provide context for older repairs. The technician will also note the size of your property and number of zones, since larger systems have more failure points.
Water Pressure Testing
Inspectors measure static pressure (water pressure at rest) and dynamic pressure (pressure while the system runs). Normal irrigation pressure ranges from 40–80 PSI; readings outside this range cause poor spray patterns and uneven watering. Low pressure often stems from leaks, undersized pipes, or clogged filters. High pressure damages sprinkhead seals and causes misting instead of proper water distribution. A multi-zone system should maintain consistent pressure across all zones.
Zone-by-Zone Activation
The technician runs each zone separately and observes sprinkhead performance. They check for:
- Broken or misaligned sprinkheads that spray sidewalks or miss planting beds
- Dry spots indicating low coverage or failed emitters
- Soggy areas revealing leaks or over-watering
- Clogged nozzles from mineral buildup or debris
This step typically takes 15–30 minutes depending on zone count.
Valve Inspection
Valves control water flow to each zone and are critical failure points. Inspectors check for:
- Corrosion or mineral deposits on valve bodies
- Leaking solenoids (the electrical component that opens/closes valves)
- Stuck or sluggish valve operation
- Cracks in valve chambers
A faulty valve costs $150–$400 to replace depending on type and location.
Controller and Timer Review
The irrigation controller is your system's brain. Inspectors verify programming accuracy, check battery backup functions, and confirm the system runs on a logical watering schedule. They'll identify outdated controllers that lack features like soil moisture sensors or weather-based adjustments—upgrades that reduce water waste by 15–30%.
Line and Connection Checks
Inspectors excavate or identify accessible underground lines to check for cracks, root damage, or corrosion. In older systems (15+ years), PVC pipes become brittle and leak. Copper or galvanized steel lines corrode internally, restricting water flow. They also inspect above-ground connections, hose bibs, and backflow preventers for leaks or damage.
What to Prepare and Expect
Have your water meter reading available before the inspection begins. The inspector may run the entire system for 10–15 minutes and compare meter movement to expected flow rates—this reveals hidden leaks. Clear access to control boxes, valves, and sprinkhead areas so the technician doesn't waste time searching.
A typical inspection takes 1–2 hours for residential systems. Budget $150–$300 for a basic inspection; more complex systems (large commercial properties, multiple zones) may run $400+. Many service providers waive inspection fees if you hire them for repairs.
The Inspection Report
Expect a detailed written report listing all findings, prioritized by urgency. Critical issues (water leaks, valve failures) need immediate attention. Moderate concerns (worn sprinkheads, controller upgrades) can be scheduled within 30 days. Minor items might wait until your next seasonal maintenance cycle.
Using a platform like Mercoly, you can compare inspection reports from multiple irrigation specialists and find trusted providers in your area who offer transparent pricing and follow-up support.
Frequently Asked Questions
Q: How often should I have my irrigation system inspected? Inspect your system annually in spring before peak watering season, and again in fall before winterization; more frequently if you notice dry patches, high water bills, or the system is 10+ years old.
Q: Can I do a basic inspection myself? You can visually check for broken sprinkheads and soggy patches, but pressure testing and underground line assessment require specialized equipment and experience to diagnose accurately.
Q: What's the average cost to fix problems found during an inspection? Minor repairs (sprinkhead replacement, timer reprogramming) run $50–$200; moderate work (valve replacement, line repairs) costs $200–$800; major overhauls can exceed $2,000 depending on system age and scope.
Compare irrigation specialists in your area today to get transparent quotes and find the right fit for your system's needs.