Sprinkler & Irrigation System Repair in Thornton, CO
Stuck valve, broken head, a zone that won't come on, or dry spots where the coverage used to be? For sprinkler repair in Thornton and across the north metro, most of what goes wrong is a fixable part, not a full replacement. We diagnose the actual fault before we quote, so you only pay to fix what's actually broken.
We fix what other companies installed, not just our own work. Family-run out of Thornton with 10+ years on Front Range systems, licensed and insured, and the price on the written estimate is the price you pay. When a system is worth saving, we save it; when the layout is fundamentally wrong, we tell you that instead of billing repairs that won't hold.
We also design and install new systems for Colorado's water restrictions: smart controllers, matched precipitation-rate heads, and drip lines for beds. And we handle the seasonal work the Front Range demands, including spring start-ups, mid-season tune-ups, and the winter blow-out that keeps frozen lines from cracking the manifold.
Sprinkler system repair: what we fix and how we diagnose it
Most sprinkler system repair calls come down to four faults, and every one of them is fixable without tearing out the system. We diagnose the real fault first, then quote the repair, and we only recommend a full replacement when the existing layout is fundamentally wrong. The four symptoms below cover almost every service call we run in Thornton, and each one gets its own section here so you can match what your system is doing.
If you want to run through the symptoms yourself before you call, our guide on what to do when your sprinklers stop working in Colorado walks the same checklist we do on-site. When you're ready, call (303) 915-8649 and we'll trace the fault instead of guessing.
Zone won't turn on: how to fix a sprinkler system that skips a zone
A single zone that stays dry while the others run points to one of three things, and we check them in order: a failed solenoid on that zone's valve, a broken wire between the controller and the valve, or a controller output that's stopped sending 24 volts. We trace it with a multimeter at the valve and at the controller terminal, so we know whether we're replacing an inexpensive solenoid or chasing a nicked wire in the trench. Bentonite clay heaves and shifts over the seasons, and on older systems we routinely find a wire splice that corroded open where the ground moved. That's the whole difference between fixing a sprinkler system right and swapping parts on a hunch.
A dead zone is almost never a dead system. Nine times out of ten it's a solenoid or one bad splice, and we can prove which with a meter before we dig.
Call (303) 915-8649 and we'll meter the zone before anyone talks about replacement.
Broken or geysering head: a same-visit fix in most cases
A head that shoots a geyser, dribbles at the base, or leaves a dry patch is usually a cracked riser, a sheared swing joint, or a worn seal, and most of them are a same-visit fix. We dig out the damaged head at the swing joint, confirm the lateral and fitting underneath aren't cracked, and set a matched precipitation-rate head so that zone stays balanced with the rest instead of drowning one corner and starving another. Chinook and downburst winds on the Front Range shear heads off at the swing joint more than people expect, so on a windy exposure we'll upgrade to a heavier swing assembly while we're in there.
Signs you're looking at a head problem, not a valve or wiring problem:
- A single geyser or fountain where a head used to pop up clean
- One dry patch that grows through the summer while the rest of the zone is green
- Heads that spray the fence, the driveway, or the sidewalk instead of the grass
- A head that never fully retracts and gets clipped by the mower
A single head is quick. A whole zone of sunken or mismatched heads takes longer, and we'll tell you which one you've got before we quote.
Stuck valve or bad solenoid: a zone that runs constantly or not at all
A zone that runs nonstop, won't shut off, or won't come on at all is almost always the valve, and the fix is a rebuild in most cases, not a replacement. A valve stuck open is usually a torn diaphragm or grit lodged under the seat, and a valve that won't open is usually a failed solenoid or a plugged bleed port. We open the valve, clean or rebuild the guts, and replace the diaphragm or solenoid rather than swapping the whole body when the body is still sound. That keeps the repair to a part and a half hour instead of digging out and re-plumbing a valve manifold.
If the manifold has been cracked by a missed winter blow-out, that's a different repair, covered in the freeze-thaw section below.
Freeze and blow-out damage: irrigation repair built for Front Range freeze-thaw
Colorado systems fail in patterns we know well. A skipped or sloppy winter blow-out leaves water in the lines, and Thornton's 30-to-36-inch frost line does the rest, cracking manifolds, splitting valve bodies, and popping fittings that show up as leaks the first week the system charges in spring.
Chinook and downburst winds shear heads off at the swing joint, and bentonite clay heaves and shifts laterals so coverage drifts season to season. When we repair a system we also check the backflow (a pressure vacuum breaker required by Colorado code) and reset the controller schedule to your watering district's odd/even window. Same crew start to finish, locator tickets called in before any digging, and daily cleanup. If you want the full rundown on protecting your lines through winter, our Colorado sprinkler winterization guide covers exactly what a proper blow-out involves and when to schedule it.
System design that follows your watering district
We design zones around plant water needs (turf vs. shrub vs. drip) and around your district's odd/even watering rules. Matched precipitation rate heads, head-to-head coverage, and zones sized so a single zone can run within the district's time window. If you're putting in a freshly laid sod lawn that needs even daily coverage to root in, we size the turf zone for that establishment window before dialing it back to a normal schedule. And if a stretch of the yard is fighting the watering window every summer, swapping that area to low-water artificial turf takes it off the controller entirely so the remaining zones have more of the window to work with.
Drip irrigation for beds and trees
Inline emitter tubing for shrub and perennial beds, individual emitters on trees, all on a separate zone with a pressure regulator and filter. Drip uses 30–50% less water than overhead spray for the same plant health.
Smart controllers and rain sensors
Wi-Fi controllers (Rachio, Hunter Hydrawise) that pull weather data and skip cycles after rain. Rain sensors hardwired as backup. Saves 30–50% on summer water bills versus a fixed-schedule controller.
Irrigation spec
Pro-grade Hunter and Rain Bird components — never the big-box value line.
How a irrigation project actually runs
Owner walk & written scope
The owner walks the property, measures, and asks what isn't working. You get a written scope with material specs by name — no allowance line items.
Design & selections
Layouts, material samples, and finish options reviewed in your space. Included in the project, not billed separately.
Permits & site prep
We pull the permit when one is required, protect existing surfaces, and prep the site. Surprises documented in writing before any change order.
Build with one crew
Same crew start to finish. Daily clean-up, dust control where needed, and a foreman you can text directly.
Walk-through & punch list
Written punch list signed by you. We don't take final payment until you sign off the walkthrough.
Ready to start your project?
Get a free sprinkler repair estimateWhat moves the price on a repair or a new install
Repairs are priced by the fault and the parts; new installs are driven mostly by zone count and pipe footage.
- $Repair scope
A single stuck valve or broken head is a quick fix. Chasing an intermittent wiring fault or replacing a cracked manifold after a missed blow-out takes longer.
- $Zone count (new installs)
More zones means more valves, more wiring, more pipe. A small front yard might be 3 zones; a corner lot can be 8 to 10.
- $Trenching
Soft ground trenches fast. Rocky lots and lots full of tree roots add hours per zone.
- $Water source
New PVB, water meter tap, or pressure regulator adds plumbing time.
- $Smart controller add-ons
Wi-Fi controller, rain sensor, and flow sensor are worth it but add to the cost.
Repairs, spring start-ups, and winter blow-outs are available for systems we installed and most others. We quote a full replacement only when the existing layout is fundamentally wrong.
Recent irrigation projects
Real homes, real scope, real craftsmanship — a snapshot of work delivered across the Denver metro.
Irrigation across the Denver metro
Frequently Asked Questions
What does irrigation system repair usually involve?+
Most irrigation system repair comes down to four faults: a zone that won't turn on (usually a failed solenoid or a broken wire), a broken or geysering head, a stuck valve (a torn diaphragm or grit under the seat), and freeze or blow-out damage to the manifold. We diagnose the actual fault with a meter and a dig at the swing joint before we quote, then repair the part rather than replacing the system. We only recommend a full replacement when the existing layout is fundamentally wrong.
Can you fix what another company installed?+
Yes. Most repair calls are stuck valves, broken heads, or bad wiring, and all of those are fixable. We diagnose the actual fault first and only quote a full replacement if the existing layout is fundamentally wrong.
How do you repair a broken sprinkler head?+
We dig out the damaged head at the swing joint, confirm the lateral and fitting underneath aren't cracked, and install a matched precipitation-rate head so the zone stays balanced with the rest. A single head is usually a same-visit fix; a whole zone of sunken heads takes longer.
Why did my valve get stuck on or off?+
A valve that runs constantly or won't turn on is almost always a torn diaphragm, grit under the seat, or a failed solenoid. We rebuild or replace the affected part rather than swapping the whole valve when the body is still good.
Do you do winter sprinkler blow-outs in Colorado?+
Yes, and on the Front Range it isn't optional. Thornton's frost line runs 30 to 36 inches, so any water left in the lines over winter can crack the manifold and split valve bodies. We blow the system out with compressed air each fall and start it back up in spring for systems we installed and most others.
Do you do spring start-ups and mid-season tune-ups?+
Yes. We charge the system, check every zone for coverage, fix any winter damage we find, and reset the controller to your watering district's odd/even schedule.
How much will a smart controller save?+
Most homeowners see 30 to 50% lower summer water bills compared to a fixed-schedule controller, plus the system skips cycles after rain automatically.
Is drip really better than spray?+
For shrubs, perennials, and trees, yes, by a wide margin. For turf, you still want spray.
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