We get a panicked 6 a.m. call almost every spring from someone whose sprinkler system started leaking overnight and now the side yard's underwater. Every single time, the warning signs were there two weeks earlier. Here are the seven we see most across Newmarket, Aurora, King City and the broader GTA — what each one really means, what the fix actually costs, and which ones you can ignore for a week vs which ones you can't.
The seven warning signs we see every spring
Walk your property with this list during your first watering of the season. If you spot two or more of these, the system isn't telling you it's tired — it's telling you it's about to fail.
One zone won't shut off (or one zone won't start)
The valve diaphragm has either failed open (zone runs forever) or seized closed (no water reaches the heads). Both come from sediment buildup over winter, freeze damage to the solenoid, or a blown wire from a January rodent. Don't wait — a stuck-open valve will run for days unnoticed and quietly destroy your water bill.
Water pooling that wasn't there last week
Wet patch in the lawn that won't dry out, soggy mulch around a valve box, or a sinkhole in the grass — that's a buried lateral line crack or a fitting that froze. Heavy GTA clay holds the water near the surface so it shows up fast. Worst case: a main-line break feeding the basement wall.
Heads that won't pop up — or pop up and stay down
Pop-up risers stuck halfway, broken nozzles, or heads that retract while still spraying. Most of the time it's a snapped rotor body (snowblowers, kids, edgers — the usual suspects), occasionally a check valve seal worn out from sand in the line. Very fixable; these are the bread-and-butter of a spring tune-up.
Mystery brown patches in the lawn
Even after a good week of watering. Usually means a head's been knocked off-axis (drifting spray pattern), a clogged nozzle, or two zones whose coverage overlap doesn't actually overlap any more. On Hydrawise systems we can pull the per-zone runtime history and pinpoint it in five minutes.
Sudden water bill jump
If your June bill is 40%+ higher than last June and the lawn doesn't look it, you have a leak somewhere. Could be one of the items above, could be an underground main-line pinhole that hasn't surfaced yet. Worth a leak-locate visit ($120 flat); the saved water pays for it in 1–2 cycles.
Controller showing errors or running zones at random times
"No flow" alerts on Hydrawise, zones running at 3 a.m. when you set them for 6 a.m., or the schedule reverting after a power blip. Often a backup-battery failure (literally a $12 fix) or a blown station fuse on the controller board. Sometimes it's the sign that a 12-year-old controller is finally done.
Cracked valve box — especially after a hard winter
The plastic lid is split, the box has heaved up, or there's frost damage visible inside. Cosmetic on its own, but it's a sign that water sat in the box and froze — meaning the valves and unions inside might also be cracked but not yet leaking. Worth opening up before the first big watering of the season.
"The two-week rule: 90% of the 'help my system flooded' calls we get could've been a $90 fix two weeks earlier. By the time the water shows up at the foundation, you're not paying for the broken part — you're paying for the cleanup."
DIY checks worth doing first
Before you call us, two minutes with a wrench and a flashlight can save you a service-call fee. Worth trying:
- Lift each pop-up head by hand. If it pops freely, the spring's fine — your issue is upstream (valve or pressure). If it sticks, dirt's probably in the riser.
- Check the controller's master shut-off display. A "rain delay" toggle or a seasonal adjust at 0% is the most common "my system isn't running" cause we see.
- Open the valve box and look for moisture. Dry box = electrical fault. Wet box = mechanical leak.
- Wiggle each head. A loose head almost always means a cracked riser nipple just below ground.
If those four don't narrow it down, it's call-a-pro territory.
Got a sprinkler problem right now?
Same-day repair is available across Newmarket, Aurora, King City and most of the GTA between April and October. We'll diagnose it on the spot and give you a fixed-price quote before any work begins.
Call (905) 960-0181Real Newmarket repair costs (no "starting at" pricing)
Honest numbers we actually charge across our service area in 2025:
- Service-call & diagnostic: $90 (waived if we do the repair same-visit).
- Single broken head replacement: $45–$90 each, all-in.
- Stuck or leaking valve: $140–$260 depending on access.
- Lateral line repair (single break): $220–$420.
- Main-line repair: $400–$900.
- Hydrawise controller swap (existing wiring): From $595 by zone count (1-4 zones $595 / 5-7 zones $750 / 8-16 zones $1,195) plus standard $95 service call.
- Full system audit + tune-up (multi-zone): $180–$280.
Why waiting two weeks turns a $90 fix into a $1,400 job
Sprinkler systems fail like roofs — slowly, then all at once. A worn valve diaphragm leaks a litre a minute for a month, then suddenly it's 30 litres a minute and you're calling at midnight. The actual broken part hasn't changed — but now you've got to factor in the lawn cleanup, possibly basement remediation, and weeks of overwatering damage to the surrounding turf.
If you're seeing two or more of the seven signs above, book a $90 service call this week. We'd rather see you in May than in July.
FAQ
Do you charge for an estimate?
No. Diagnosis runs $90 and is waived if we do the repair on the same visit. Estimates for new installs or larger jobs are always free.
How fast can you get out for emergency repair?
Same-day across our service area between April and October, depending on the call queue. If we can't reach you the same day, we tell you that on the phone — we don't string people along.
Is it cheaper to repair an old system or replace it?
If the controller is 10+ years old, the heads are mostly first-generation, and you're getting a third repair this season — replacement starts to make sense. We'll lay out the math honestly during the diagnostic; we don't push installs that don't pay back.
The bottom line
A spring sprinkler system in Newmarket goes through about 60 freeze-thaw cycles every winter. Most survive it. The ones that don't almost always show their hand in the first two weeks of the season. Walk your lawn with this list, fix the small stuff fast, and you'll never be the 6 a.m. flood call. Book a diagnostic visit or call (905) 960-0181.