“If your sprinkler system isn’t saving you time, money, and hassle—it’s probably costing you all three.”
Every year, we get hundreds of calls from homeowners in Columbia, Annapolis, Bowie, Silver Spring, and beyond asking why their irrigation system isn’t working like it should.
Sometimes it’s a small fix. Sometimes it’s been broken for months and nobody noticed.
Here are the 7 most common sprinkler problems we fix every season—and how to spot (and avoid) them.
1. Broken or Clogged Sprinkler Heads
This is the #1 issue we see—especially in spring and early summer.
Common signs:
- Uneven spray pattern
- No water coming out
- Sprinkler stuck half-up
- Water pooling around a head
What causes it:
- Lawn mower damage
- Dirt, debris, mulch clogs
- Frozen heads from improper winterization
How we fix it:
- Replace damaged heads
- Flush or clean clogged nozzles
- Re-level heads that sunk into the soil
Real Story: Bowie Homeowner One client had a $120/month water bill spike. Turns out, a head near their sidewalk had popped off and was shooting a geyser straight into the street.
We replaced the head, reset the arc, and added a nozzle guard for future protection. Their bill went back to normal the following month.
2. Leaking Underground Pipes or Valves
Leaks under the surface can go unnoticed—but they’ll wreck your water bill and your soil.
Signs:
- Soft or soggy spots in lawn
- Drop in pressure on one zone
- System takes longer to pressurize
We use pressure testing, visual inspection, and zone isolation to find leaks fast.
Case Study: Silver Spring Yard We found a lateral line leaking under a landscape bed. Repaired it in 90 minutes—and saved the homeowner hundreds.
In another case in Potomac, a leaking valve box was flooding the garden bed for weeks before anyone realized. We replaced the valve and restored the bed.
3. Controller Problems or Bad Programming
If your controller’s off, everything’s off.
Signs:
- System doesn’t run
- Watering wrong days/times
- Rainy day watering
Fix:
- Replace old or corroded controllers
- Reprogram for proper run times and seasonal needs
Smart controllers like Rachio or Hunter Hydrawise adjust based on weather—and save 20–40% on water.
Client Example: Columbia Upgrade We swapped out an outdated timer for a Hydrawise unit. Client now gets alerts, skips watering during storms, and controls everything from their phone.
In Laurel, a homeowner using a 15-year-old timer was unknowingly running all zones twice a day. Their water bill dropped by $300 annually after we reprogrammed with a smart schedule.
4. Zone Not Turning On
One zone dead? It’s often a wiring or valve issue.
Causes:
- Broken wire
- Faulty solenoid
- Controller relay issues
We isolate the issue and either rewire or replace valves—sometimes right at the manifold, sometimes mid-line.
Quick Tip: Don’t just assume the head is broken. If nothing comes on in a full zone, it’s an electrical or plumbing problem.
Real Fix: Annapolis Backyard Zone 5 wasn’t turning on. We found a cut wire from a recent fence install. One splice and a new waterproof connector later, the zone was back online.
5. Mismatched or Misaligned Heads
Different heads = different flow rates.
If your system mixes rotors, sprays, and bubblers in one zone—you’ll get overwatering and underwatering at the same time.
We match head types by: – Precipitation rate – Spray arc – Application area
Real Fix: Annapolis Rebuild One client had rotors watering turf—and sprays drowning a flower bed—in the same zone. We split it into two zones and dialed everything in.
The result? No more brown patches, no more flooded beds—and a 25% drop in monthly water use.
6. Backflow Preventer Issues
Your backflow preventer keeps dirty water out of your drinking water. If it’s broken, leaking, or freezing—you’ve got a problem.
We inspect: – Test cocks – Valve seals – Freeze damage
And yes—we perform required annual testing in Montgomery and Howard Counties.
Pro Tip: Drain your backflow in the fall. That one step prevents hundreds in damage.
Customer Experience: Bethesda Home A homeowner failed to winterize. A single freeze cracked their backflow—$600 in repairs that could’ve been avoided with our $119 fall blowout special.
7. Poor Coverage or Dead Spots
We see this all the time: – Heads spaced too far apart – Sprays blocked by plants – Shadows from fences or trees
Fixes include: – Adjusting arcs and throw distance – Adding heads to eliminate gaps – Upgrading to matched precipitation rate nozzles
Homeowner Story: Ellicott City Lawn Revived We added two heads to a patchy back corner. Within weeks, the grass was thriving again.
Another project in Crofton involved rotating spray arcs away from a hot driveway and increasing coverage on a south-facing slope. Huge improvement in turf health.
Pro Tips to Avoid These Problems
- Get a spring tune-up: catch leaks, program controller, test coverage
- Add a mid-summer check to prevent heat stress damage
- Always winterize before the first deep freeze
- Upgrade to smart tech for water-saving automation
- Watch your water bill—a sudden spike is often the first clue
FAQs About Sprinkler Repairs
Q: “How often should I have my system checked?”
A: At least once per season. Spring and mid-summer are ideal.
Q: “Do you work on systems you didn’t install?”
A: Absolutely. We service all major brands—and fix a lot of jobs done by the other guys.
Q: “Can I tell if I have a leak without digging?”
A: Often yes. We look for pressure drops, water meter spikes, and soft spots.
Q: “Are repairs covered under warranty?”
A: Yes—if we installed it, we stand behind it. We also offer service plans for ongoing coverage.
Q: “Is it worth upgrading an older system?”
A: In many cases, yes. We can retrofit smart tech, improve efficiency, and bring it up to modern standards without full replacement.
Final Word from Bob
If your sprinkler system isn’t working right, you’re not saving water—you’re wasting it.
The good news? Most issues are easy to fix when caught early.
So whether you’ve got a dead zone, a leaky head, or a controller from 1995, give us a call. We’ll get your system back on track—and help your lawn look its best.
We’ve been fixing sprinkler systems in the DMV since 1983. We know what works, what fails, and how to make your system last.
Let’s tune it up right—before the next big bill or the next big storm.
—Bob Carr, Founder
TLCIncorporated.com
We’ve been helping folks in the DMV area since 1983.