What really happens when you don’t winterize your sprinkler system in the DMV region?
“If you’ve ever seen a geyser in a front yard in March, chances are someone skipped winterization.”
Every year, TLC Inc. gets dozens of urgent calls from homeowners in Bowie, Silver Spring, Columbia, and beyond who forgot—or chose not—to winterize their sprinkler system.
And every year, the result is the same: – Cracked pipes – Broken backflows – Water bills through the roof – Thousands in repairs that could’ve been prevented
So let’s break it down: what really happens when you don’t winterize your sprinkler system in the DMV region?
1. Water Freezes—and Expands
Your sprinkler system holds water in: – PVC or poly pipes – Valves and manifolds – Sprinkler heads – Backflow preventers
When temperatures drop below freezing, that water turns to ice—and ice expands.
That expansion can: – Crack pipes underground – Burst valve seals – Split sprinkler heads – Blow out your backflow preventer
Real Story: Columbia Backflow Disaster
A homeowner skipped winterization. December got mild… then a cold snap hit.
Their backflow preventer split wide open. They didn’t notice until water started flooding the sidewalk in March. Cost: $1,200 to replace.
We now winterize their system every October. No surprises since.
2. Underground Damage Goes Undetected
Unlike indoor plumbing, your irrigation system is buried.
So when pipes crack under the soil, you don’t see it right away. What you’ll notice is: – A slow spike in water bills – Soggy lawn spots – Zones that don’t hold pressure
In many cases, the damage isn’t found until spring startup—when the system fails to pressurize, or water starts gushing from the ground.
Real Case: Fairfax Spring Startup Nightmare
This homeowner thought their system “made it through winter just fine.” At spring start-up, three zones failed. Why? Cracks in two lateral lines and one valve. Total repair cost: $2,600.
3. Repairs Are More Expensive Than Prevention
The average TLC winterization costs $119–$179, depending on system size.
Repairs from a freeze-up? – Backflow replacement: $500–$1,200 – Cracked lateral lines: $300–$800 per repair – New heads, valves, fittings: $50–$150 each
We’ve seen homeowners pay $3,000+ in spring to repair what a fall service could’ve prevented for a fraction of the cost.
Real Case: Silver Spring System Rebuild
A family delayed winterizing by two weeks. A freeze burst multiple pipes. Their spring startup became a full system rebuild.
They now winterize every October—and tell their neighbors to do the same.
Added Risk: Multiple Freeze/Thaw Cycles
Our region doesn’t always get sustained cold. But that’s even more dangerous—because freeze/thaw cycles cause expansion and contraction that weakens joints and fittings.
Just one week of hard freezes in December followed by a warmup in January? That’s a recipe for disaster if your system still has water inside.
4. You Void Manufacturer Warranties
Most sprinkler system parts—especially backflow preventers—come with limited warranties.
But freeze damage? Not covered.
Manufacturers expect you to take basic care of your system. Skipping winterization is considered negligence.
That means: – You pay for replacement – No warranty claims – Often no parts in stock when spring demand hits
We’ve helped clients in Laurel, Gaithersburg, and Ellicott City fight warranty denials after freeze-ups—but the outcome is always the same. No coverage.
5. Your Water Supply Could Be Contaminated
Backflow preventers aren’t just a plumbing part—they protect your drinking water.
If a freeze cracks the assembly, dirty water from your yard can siphon into your home’s plumbing. That’s not just costly—it’s a serious health risk.
Imagine: – Lawn fertilizer in your kitchen tap – Bacteria from soil entering your system – No warning until someone gets sick
Properly drained and blown out systems protect your home and your family.
FAQs About Winterization
Q: “When should I winterize?”
A: Between October 15 and Thanksgiving, depending on weather. Earlier is safer. Don’t wait for the first freeze warning—it’s often too late by then.
Q: “Can I do it myself?”
A: Only if you have a commercial-grade air compressor and know the correct PSI. Shop compressors won’t cut it—and using one can damage your system.
Q: “Do I need to do it every year?”
A: Yes. Even mild winters can include surprise freezes. It only takes one night below 32°F to do damage.
Q: “What if my system says it’s ‘self-draining’?”
A: Some are partially self-draining—but most still need blowout service to be fully protected. We’ve seen “self-draining” systems freeze more than once.
Q: “Can you remind me each year?”
A: Yes! We offer reminder emails, texts, and preferred scheduling windows for regular customers.
How TLC Winterizes Systems (The Right Way)
Our winterization service includes: 1. Turning off the main irrigation water 2. Releasing all system pressure 3. Blowing out every zone with a high-CFM compressor 4. Draining and securing the backflow preventer 5. Checking and logging any issues for spring
We do it fast, clean, and right—the first time.
No shortcuts. No gimmicks. No damage.
More Customer Stories from Across the DMV
Annapolis Winter Save
We winterized a waterfront system in mid-October. Their neighbor didn’t—and ended up with cracked poly lines under a stone patio. Total repair: $4,700.
Our client? Zero damage. Peace of mind. Booked again this year.
Gaithersburg Business Complex
This commercial property had 12 zones. We blew out the system over two hours, caught a pressure drop in zone 3, flagged a stuck valve, and repaired it before the freeze.
Result: Full protection + no downtime in spring.
Bonus Tip: Schedule Early, Avoid the Rush
We get booked solid every fall. Waiting until the last minute? – You may miss the safe window – Risk a surprise cold snap – Get stuck paying for emergency service
Our advice: schedule by mid-October. Get it done. Get it off your list.
Final Word from Bob
Winterization isn’t just another seasonal task. It’s the cheapest insurance policy for your irrigation system.
If you’ve already invested in a lawn sprinkler system, protect it.
Don’t leave it to chance. Don’t wait for the first freeze warning.
Give us a call. We’ll get your system blown out properly—so you can rest easy all winter long.
We’ve been winterizing systems across Maryland, D.C., and Northern Virginia since 1983. We know what works. We know when it fails. And we know how to get it right the first time.
—Bob Carr, Founder
TLCIncorporated.com
We’ve been helping folks in the DMV area since 1983.
Call TLC Incorporated When You Need The Best in Lawn Sprinkler Systems
For more than 35 years, TLC Incorporated has specialized in the planning, installation, and maintenance of high-quality commercial and residential lawn sprinklers and irrigation systems, lawn lighting, outdoor lighting, and more. Bob Carr and his talented staff have been keeping the Mid-Atlantic Region green and well-lit with pride for decades. When you need help with lawn drainage, irrigation, or lighting design, you can contact us to evaluate your lawn and guarantee excellent results. You can follow us on Facebook, Instagram, and YouTube for updates on our most recent projects.