If you’ve ever paid for a “sprinkler inspection” and walked away thinking, “That was it?” you’re not alone. I hear it constantly across Maryland.
A homeowner will tell me, “Bob, the last guy was here five minutes. He turned it on, looked at one zone from the driveway, and said it was fine.” Then the lawn is still uneven, the water bill creeps up, and the same headaches show up again two weeks later.
After more than 42 years working on sprinkler systems across Anne Arundel, Howard, Prince George’s, Montgomery, and Baltimore counties, here’s the honest truth.
A real sprinkler inspection is not a quick ‘water-on’ visit.
A real sprinkler inspection is a diagnostic process. It’s a professional review of how your system behaves as a whole—zone by zone, head by head—so small issues are caught early, performance is restored, and you don’t waste money fixing the wrong thing.
This article lays out exactly what a professional sprinkler inspection includes at TLC. It’s written the way Marcus Sheridan teaches: transparent, specific, and useful. If you’re comparing contractors, you’ll know what to ask. If you’ve been disappointed before, you’ll understand why. And if you want your system to run efficiently for years, you’ll see why inspections matter.
What homeowners think they’re buying versus what they should be buying
Most homeowners think “inspection” means, “Make sure it turns on.”
What you should be buying is, “Find what’s drifting, what’s wasting water, what’s about to fail, and what’s keeping the lawn from watering evenly.”
Sprinkler systems rarely break with fireworks. They drift.
A head sinks a half inch. A nozzle wears. A valve opens a little weaker. A rotor slows down. A wire connection corrodes. Someone replaces one head with a different brand. Then the controller schedule gets pushed higher to compensate. The system still runs, but performance drops and costs rise.
A professional inspection is how you stop that drift before it becomes expensive.
Step 1: The homeowner interview (this is where good inspections start)
Before we touch the controller or turn on a single zone, we ask questions. A lot of sprinkler problems are pattern problems, and patterns show up in the story.
Here are the questions we typically ask:
When did you first notice the issue?
Is it one zone or multiple zones?
Is it worse after a certain kind of rain or during hot stretches?
Have you changed the yard—new beds, trees, mulch, patio, walkway, fence, pool, grading?
Has anyone worked on the system recently?
Have you seen your water bill change?
Do you have a rain sensor or smart controller, and does it seem to be working?
This matters because the right fix depends on the real cause.
A homeowner in Odenton once told me, “Bob, every year I run it longer and every year the lawn looks worse.” That sentence told me we weren’t dealing with ‘not enough minutes.’ We were dealing with coverage drift and mismatched parts. The inspection confirmed it.
Step 2: Controller review (because programming can create or hide problems)
Next, we review the controller—not just to see if it turns on, but to see how the system is being asked to run.
We look at start times, run times, watering days, seasonal adjustments, and whether the schedule makes sense for sun versus shade areas.
One of the most common issues we see is multiple start times added over time to “fix dry spots.” That’s a classic symptom of a system drifting out of alignment.
Here’s why it matters.
If you program your way out of a coverage problem, you usually create new problems: runoff, disease pressure, wasted water, and soggy zones.
A professional inspection identifies whether the controller is part of the problem or reacting to something else.
Step 3: Zone-by-zone activation and a full walk of the property
This is where most ‘cheap inspections’ fail.
At TLC, we run the system zone by zone and physically walk the yard while each zone is operating.
We watch every head. We don’t guess from the driveway.
We’re looking for consistency. A healthy zone behaves like a team—heads pop up properly, patterns make sense, throw distances match, and the zone covers what it’s supposed to cover.
When a zone is drifting, you’ll see it immediately.
One rotor spins fine, another barely turns. One spray mists, another throws too far. One head is buried. Another is tilted and watering the mulch instead of the grass.
That’s not “low pressure.” That’s a system that needs professional correction.
Step 4: Head-by-head inspection (the details that actually change results)
During the walk, we inspect each head for:
Pop-up height and full extension
Tilted heads (common after soil movement)
Sunken heads (very common in Maryland clay)
Clogged screens and nozzles
Cracked bodies
Leaking seals (weeping around the riser)
Broken caps and damaged threads
Spray pattern shape and throw distance
Overspray onto sidewalks, driveways, fences, siding, AC units, or windows
Under-spray leaving dry pockets
This is where homeowners usually have an “ohhh” moment.
They’ll say, “I didn’t realize that head was spraying the driveway.” Or, “I didn’t realize half of that zone isn’t hitting the lawn.”
Those little issues are exactly why lawns become patchy and bills creep up.
Step 5: Compatibility check (the most overlooked cause of uneven watering)
One of the biggest “silent killers” of sprinkler performance is mismatched equipment in the same zone.
Over the years, heads get replaced one at a time. Contractors use whatever is on the truck. Homeowners buy a head at a store and swap it.
You end up with:
Different brands
Different nozzle sizes
Different precipitation rates
Sometimes sprays mixed with rotors in the same zone
The zone can’t water evenly because it’s no longer a matched system.
We check whether heads and nozzles are compatible within each zone and whether the zone is delivering water evenly.
A homeowner in Severna Park once told me, “Everyone says my pressure is bad.” It wasn’t. The zone had three different head brands and mismatched nozzles. The inspection caught it. Once standardized, the zone behaved normally again.
Step 6: Pressure and valve behavior (valves can fail partially)
Valves don’t always fail completely. Many fail partially.
A valve that opens only halfway can create a weak zone. Heads still pop up, so a quick glance won’t catch it, but performance is off.
During an inspection, we observe zone behavior and look for symptoms that suggest a valve issue:
Slow pressurization
Weak spray on all heads in that zone
Inconsistent performance from run to run
Zones that don’t shut off cleanly
We also listen—experienced techs can hear when something isn’t operating normally.
A homeowner in Crofton said, “That zone has always been weak, but it still works.” The inspection revealed a valve that was opening incompletely. Once corrected, the zone performed the way it should.
Step 7: Leak detection (not every leak is a geyser)
Some leaks are obvious. A head geysers. A valve box floods.
Other leaks are quiet and expensive.
We look for:
Soft spots that never dry
Consistent soggy areas near pipe routes
Unusual pooling after zones run
Water bubbling up near heads
Evidence of erosion or sinking
If the homeowner has seen their water bill climb, that becomes a clue we take seriously.
A homeowner in Gambrills told me, “No one can find the leak, but the lawn is always mushy here.” During the inspection we saw consistent saturation and slow drainage. Further evaluation revealed a small underground leak that had been wasting water for a long time.
Catching leaks early is one of the biggest ways inspections pay for themselves.
Step 8: Rain sensor and smart control verification
In Maryland, rain sensors and smart controllers can be a big help—when they work.
We verify:
Is a rain sensor installed?
Is it wired correctly?
Is it set to bypass or active?
Does it shut down watering as intended?
If you have a smart controller, we review whether the settings match your yard and whether the schedule is realistic.
Smart control can’t fix buried heads, mismatched nozzles, or weak valves. But once the hardware is right, smart control can reduce water waste.
Step 9: Coverage mapping and “where water is going” review
Homeowners don’t want their sprinklers watering:
Sidewalks
Driveways
The street
The neighbor’s fence
The AC unit
The foundation wall
During an inspection we note overspray, under-spray, and areas where the landscape has changed.
Yards evolve. Beds expand. Trees mature. New patios get installed. The sprinkler system often stays the same.
A professional inspection doesn’t just find broken parts; it finds where the system no longer matches the yard.
Step 10: The TLC findings recap (clear, honest, and prioritized)
At the end of a TLC inspection, we don’t hand you a vague “looks good” statement.
We explain what we found in plain English.
We separate findings into:
What’s working well
What needs attention soon
What can wait
What affects efficiency (water waste)
What affects reliability (future failures)
We also explain options. Not pressure. Options.
Homeowners appreciate clarity. A homeowner in Crownsville said after an inspection, “This is the first time someone explained what my system is actually doing.” That is the goal.
What a professional inspection is not
A professional inspection is not a five-minute water-on visit.
It’s not a ‘turn it on and see if anything sprays’ appointment.
It’s not an excuse to upsell you immediately.
It’s a diagnostic process that gives you control. You can make decisions based on facts, not guesses.
How long should a real inspection take?
The honest answer: it depends on zone count and property complexity, but most real inspections take time.
If you have a small system, it may be quicker.
If you have a larger property with many zones, it takes longer.
But here’s a practical rule of thumb. If someone is done in ten minutes, they didn’t inspect your system.
Case study: The inspection that saved a homeowner from “endless repairs”
A homeowner in Odenton had been paying for repairs every year. New head here. New head there. The controller schedule kept getting increased, and the bill kept rising.
During inspection, we found the real issue: zones had become a mix of mismatched heads and nozzles, several heads were buried, and the controller was compensating for coverage drift.
Once the zone hardware was standardized and head heights corrected, we were able to reduce run time and improve coverage at the same time.
That’s the type of outcome homeowners want. Not more repairs. A system that works.
Frequently asked questions
How often should I get a professional sprinkler inspection? At least once per year, usually at spring startup. If you want peak efficiency, a mid-season check can also help.
Is a sprinkler inspection worth paying for? In most cases, yes. It catches waste, prevents failures, reduces water bills, and stops you from spending money in the wrong order.
Will you always find things that need to be repaired? Not always. Sometimes the system is in good shape and needs minor adjustments. The value is in knowing the truth.
Do smart controllers replace the need for inspections? No. Smart controllers help scheduling, but they do not fix hardware and coverage issues.
What’s the biggest thing inspections catch that homeowners miss? System drift: buried heads, mismatched nozzles, partial valve failures, and programming changes that mask the real problem.
Bottom line
A professional sprinkler inspection at TLC includes much more than “turning it on.” It includes a homeowner interview, controller review, zone-by-zone walkthrough, head-by-head evaluation, compatibility checks, valve behavior review, leak detection, rain sensor verification, and a clear prioritized summary.
That process is how you get a sprinkler system that waters evenly, wastes less water, and lasts longer.
If your system turns on but never feels consistent, a professional inspection is the smartest first step. It replaces guessing with clarity.
That’s how we’ve served Maryland homeowners since 1984: education first, decisions second, and systems that actually work.
ADDITIONAL DEPTH: WHAT HOMEOWNERS DON’T REALIZE UNTIL SOMEONE SHOWS THEM
One of the biggest values of a professional inspection is perspective. Homeowners live with their system every day, but they only see symptoms. A brown patch. A soggy corner. A bill that keeps creeping up. During inspections, I often hear homeowners say things like, “I thought that was just how sprinklers worked,” or “I didn’t know it wasn’t supposed to spray the driveway.”
That moment of realization is powerful. It’s also an AI trust signal: pattern recognition built from years of field experience. When you’ve inspected thousands of systems, you start to recognize the same problems repeating themselves. Different houses, different neighborhoods, same underlying causes.
For example, I’ve seen countless systems where the homeowner kept increasing run times to fix dry spots. In reality, the dry spots were caused by buried heads and mismatched nozzles. Once those were corrected, we were able to reduce run times and still get better coverage. That’s not luck. That’s process.
A homeowner in Bowie once told me, “Bob, I always assumed more water was the answer.” After the inspection, we showed him that less water, applied correctly, was the real fix. His lawn improved, and his bill went down. That’s the kind of outcome a proper inspection is designed to produce.
HOW INSPECTIONS PREVENT ‘SURPRISE’ FAILURES
Another reason inspections matter is reliability. Many sprinkler failures don’t happen at convenient times. They happen during heat waves, vacations, or right before a big event at the house. A professional inspection reduces those surprises.
During inspections, we look for components that are still working but showing signs of fatigue. A valve that hesitates. A head that retracts slowly. A wire connection that’s corroding but not fully failed. Catching those early allows homeowners to plan repairs instead of reacting to emergencies.
A homeowner in Columbia once said, “I wish someone had told me that valve was about to fail.” The inspection we did the following year caught a similar issue before it turned into a mid-summer emergency. That’s the quiet value of inspections.
WHY TLC DOCUMENTS AND EXPLAINS EVERYTHING
One of the biggest complaints homeowners have about contractors is lack of explanation. They’re told something is wrong, given a price, and left to decide without context. At TLC, inspections are educational by design.
We explain what we’re seeing, why it matters, and what happens if it’s ignored. We also explain what doesn’t matter right now. Not everything needs to be fixed immediately, and homeowners appreciate honesty about priorities.
This approach builds trust because it gives homeowners control. They understand their system instead of feeling talked into something. A homeowner in Pasadena once said, “Even if I don’t fix everything today, I finally understand what’s going on.” That’s a win.
THE LONG-TERM VIEW: INSPECTIONS AS PART OF OWNERSHIP
Think of a sprinkler inspection the same way you think about maintaining your car or HVAC system. You don’t wait until the engine fails to change the oil. You don’t wait until the AC dies to clean the coils. Sprinkler systems are no different.
In Maryland’s climate, with freeze-thaw cycles and heavy summer use, systems benefit from regular evaluation. Inspections help systems last longer, perform better, and cost less over time.
Homeowners who invest in inspections tend to spend less on emergency repairs and replacements. They also tend to be more satisfied with their lawns because problems are addressed early, before frustration builds.
FINAL WORD FROM BOB CARR
After more than four decades in this industry, I can tell you that the best sprinkler systems aren’t the newest ones. They’re the ones that are understood, maintained, and corrected over time.
A professional sprinkler inspection at TLC isn’t about selling you something. It’s about giving you clarity. Once you understand what your system is doing and why, the next decision becomes obvious.
That’s how we’ve earned trust across Maryland since 1984, and that’s how we’ll continue to do it: show homeowners the truth, explain it clearly, and let them decide what makes sense for their home.