IRRIGATION SYSTEM INSPECTION
$150 — Added to a Home Inspection
$400 — Standalone (includes $250 trip fee)
What Most Buyers Never Think to Ask About
When you are buying a home with an irrigation system, there is a question almost nobody thinks to ask: has this system been properly winterized every year since it was installed?
In Chicagoland, that question matters more than almost any other question about an irrigation system. A single Illinois winter without a professional blowout — one season where water was left in the pipes, valves, or backflow preventer — can crack underground supply lines, destroy zone valves, split the backflow preventer housing, and warp every sprinkler head in the yard. That damage is invisible until the system runs again in the spring. By then, you own the problem.
An irrigation inspection is not glamorous. But in Chicagoland, it is one of the more straightforward ways to find out whether the system you are inheriting is healthy — or whether the first spring startup is going to come with a repair bill.
The Industry Norm vs. What We Do
The InterNACHI Standards of Practice — the national standard that most Illinois inspectors follow — explicitly states that irrigation systems are not required to be inspected as part of a standard home inspection. Irrigation is listed by name as an item inspectors are not required to inspect. Most Chicagoland home inspectors do not include it, do not offer it, and do not mention it unless asked.
Of the inspectors who do offer it as an add-on, the typical scope is: run the zones, look for obviously broken heads, and note whether the system appears to be working. That is it. If the system has been winterized for the season, most inspectors note it is inactive and stop there.
The Chicagoland Factor — Why This Inspection Matters Here Specifically
Illinois winters do things to irrigation systems that buyers in warmer states never have to think about.
Water left in an irrigation system when temperatures drop below freezing expands. That expansion cracks pipes underground, splits the brass housing of backflow preventers, destroys zone valve bodies, and warps sprinkler heads at the surface. A single season of improper winterization — or no winterization at all — can create damage across every component of the system simultaneously.
The damage is not always visible when you walk the property. The underground pipes look fine. The heads sit flush. The controller panel shows no errors. Everything appears intact until someone turns the system on in April. At that point, the water finds every crack.
There is also a code compliance issue that most buyers never hear about: Illinois law requires annual backflow preventer testing for properties with irrigation systems. Most homeowners are unaware of this requirement. We flag it on every irrigation inspection so you know what you are inheriting before you close.
What a Seasonal Limitation Actually Means
If the system has been winterized for the season — typically October through April in Chicagoland — we cannot run the zones. Turning on a winterized system risks damaging the compressor that blew it out and can reintroduce water into components that were deliberately cleared.
What we can do in winterized season: inspect the controller, evaluate the backflow preventer, open every valve box, assess visible heads and supply lines, document programming, and look for all evidence of past freeze damage that is already visible. That is a meaningful amount of information — and the freeze damage we are most concerned about often shows itself on the components we can access.
When the system is active — typically May through September — we run every zone and do a complete operational inspection.
What We Inspect — Component by Component
🕹️ THE CONTROLLER
The controller is the brain of the system. It determines when each zone runs, for how long, and how often. A controller that is old, poorly programmed, or missing a rain sensor is wasting water on a schedule — regardless of whether it rains.
We evaluate:
Controller age and model — newer smart controllers can reduce water usage by 30 to 50 percent compared to older timer-based units
Current programming — zone run times, frequency, and whether they are appropriate for Chicagoland's seasonal patterns
Rain sensor presence and function — a rain sensor prevents the system from running during and after rainfall. Without one, the system waters regardless of weather
Wiring connections inside the controller — disconnected or corroded wires are a common cause of zones that fail to activate
Evidence of a low-voltage wiring fault — a shorted zone wire will prevent that zone from opening and is not always obvious without checking the controller
🔄 THE BACKFLOW PREVENTER
The backflow preventer is the most code-critical component of an irrigation system in Illinois. Its job is to prevent irrigation water — which contacts soil, fertilizer, pesticides, and bacteria — from flowing backward into the home's potable water supply.
Illinois law requires this device be tested annually. Many homeowners are unaware of this requirement, and many sellers cannot produce documentation of annual testing. We note this on every irrigation inspection report.
We evaluate:
Type of backflow preventer — pressure vacuum breaker, double-check valve assembly, or reduced pressure zone — each has different installation requirements and maintenance needs
Physical condition — cracks, corrosion, mineral buildup, and evidence of freeze damage are all inspected
Proper installation height — a pressure vacuum breaker must be installed at least 6 inches above the highest sprinkler head or it cannot function correctly
Shutoff valve operation — both shutoff handles must turn freely and seal completely
Evidence of prior freeze damage — a cracked or repaired backflow preventer is the single most common sign of a winterization failure in Chicagoland
Illinois annual testing compliance — we note whether documentation exists and whether the buyer should budget for annual testing going forward
🔧 ZONE VALVES AND VALVE BOXES
Zone valves control water flow to each section of the system. They are typically housed in in-ground valve boxes scattered across the property. Many buyers never open these boxes. We open every one.
We evaluate:
Valve condition and operation — each valve is activated during zone testing to confirm it opens and closes cleanly
Evidence of valve body cracking — a common freeze damage finding in Chicagoland
Valve box condition — standing water or flooding in a valve box indicates a leaking valve or poor drainage, and can accelerate corrosion
Wiring connections at each valve — corroded or loose wire connections are a frequent cause of zones that will not activate
Solenoid condition — the solenoid is the electrical component that opens the valve when the controller sends a signal. Failed solenoids are common on older systems
💦 SPRINKLER HEADS — EVERY ZONE, EVERY HEAD
Running every zone is the only way to evaluate head performance. We run all of them. We walk each zone while it is operating and document what we see.
We look for:
Broken or cracked heads — a common freeze damage finding, and also caused by lawn equipment and vehicle contact
Sunken or tilted heads — a head that has settled below grade or tilted from frost heaving will spray in the wrong direction entirely
Clogged nozzles — debris, mineral buildup, or turf intrusion into the nozzle creates uneven spray patterns and dry patches
Misaligned rotors — rotor heads that have drifted from their original arc setting waste water on hardscape and miss intended coverage areas
Heads spraying onto structures, walks, or driveways — overspray onto hardscape is pure waste and can accelerate staining and surface deterioration
Coverage gaps — areas of the lawn receiving no water from any head, which show up as dry patches or dead turf at the zone margins
Pressure problems — zones with insufficient pressure produce short, weak spray; zones with excessive pressure produce misting and drift instead of targeted coverage
🌊 WATER PRESSURE AND SUPPLY
Pressure problems affect every head in a zone and are not always obvious without running the system and observing the spray pattern.
We evaluate:
Overall system pressure — adequate pressure at the heads requires adequate supply pressure at the connection point
Zone-by-zone pressure variation — some zones may show pressure loss while others operate normally, indicating a zone-specific issue
Evidence of underground line leaks — a leaking supply line between the valve and the heads will reduce pressure in that zone and produce wet spots or unusual grass growth patterns above the line
Main irrigation shutoff location — documented for the buyer's reference
🌿 THE PROPERTY WALK — WHAT THE LAWN TELLS US
Before running a single zone, we walk the property and read the landscape. The condition of the lawn and plantings tells a story about how the system has been performing — or not performing.
We look for:
Dry patches — areas of dead or stressed turf that indicate heads are missing, blocked, or misaligned
Wet spots or soggy areas — indicate a leaking head, leaking supply line, or a valve that is not closing fully
Overgrown vegetation blocking heads — a bush or ground cover that has grown over a head since the system was installed will block spray entirely
Turf growing over heads — heads that have not been maintained sink below the lawn surface over time
The Most Common Findings in Chicagoland
Based on the systems we inspect across Cook, Lake, DuPage, McHenry, Will, and Kane Counties, here is what we find most frequently:
Freeze damage to the backflow preventer. This is the single most common significant finding on older systems. A cracked or repaired backflow preventer means the system was not properly winterized at least once. Replacement runs $300 to $900 plus labor.
Broken heads from frost heaving. Chicagoland's freeze-thaw cycles push heads out of alignment and crack housings. A single broken head is inexpensive to fix. A system where heads were never replaced after years of freeze cycles can have a dozen broken heads across multiple zones.
Zone valve body cracks. Water left in brass valve bodies during a hard freeze expands and splits the housing. A cracked valve cannot hold pressure and will either fail to open or fail to close. Replacement runs $50 to $250 per valve.
Controller programming that wastes water. Older timer-based controllers are frequently programmed to run regardless of rainfall, during the hottest part of the day, or for longer durations than the zones need. We document the current programming and note obvious inefficiencies.
Missing or non-functional rain sensors. Without a working rain sensor, the system runs on schedule through thunderstorms. Illinois requires rain sensors on systems installed after 2009. Older systems rarely have them.
No backflow testing documentation. Illinois requires annual backflow preventer testing. Most homeowners have never heard of this requirement. We flag it so you know what to budget for going forward.
What This Inspection Costs vs. What It Can Find
At $150 added to your home inspection, this is one of the most straightforward value calculations available when the home has an irrigation system.
A new irrigation system for a typical Chicagoland property costs $3,000 to $10,000 depending on the number of zones and property size. The system you are inheriting is part of that property value. Knowing its condition before you close gives you information. Not knowing gives you a surprise.
The most expensive single finding — a failing backflow preventer that has been leaking into the water supply — costs $300 to $900 to correct. Finding it before closing means the seller owns the repair. Finding it three months after closing means you do.
A Straight Answer on When It Is Worth It
We will give you our honest opinion before you decide.
It is most worth it when: The home has been on the market for an extended period with no one maintaining the system. The seller cannot confirm professional winterization every year. The system is older than 10 years with no service records. There are visible dry patches, wet spots, or damaged heads already visible. The home has a large lot with many zones.
It is less critical when: The system is newer — under 5 years — with documented annual service and winterization by a professional company. The seller has a complete service history. You are purchasing during the active season and can verify the system operates correctly.
We will tell you which category your home falls into before you add this to your order.
312-544-9180
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