A broken sprinkler system wastes water, money, and your landscaping investment all at once. Catching problems early keeps your lawn healthy and repair costs manageable instead of facing a complete system replacement. Here's what to watch for and when to call a professional.
Uneven Water Coverage Across Your Lawn
If some patches of grass are dry while others are soggy, your sprinkler heads aren't distributing water evenly. This typically means a head is clogged, misaligned, or damaged—common issues that develop within 3-5 years of regular use, especially in areas with mineral-heavy water.
Walk your yard during a watering cycle and look for heads that aren't popping up fully or spraying in odd directions. Debris, sediment, or lawn clippings often lodge in the nozzles. A professional can clear clogged heads ($50–$150 per service call) or replace damaged ones ($15–$40 per head, plus labor).
Low or Inconsistent Water Pressure
Weak water pressure at your sprinkler heads signals either a supply-line leak, a broken backflow preventer, or a clogged filter. Pressure issues usually worsen over time and lead to inadequate root penetration in your plants.
Check your water meter with all irrigation and household water off; if it's still running, you have a leak somewhere in your underground lines. Underground line leaks run $300–$800 to repair depending on depth and location. Don't ignore this—a small leak can waste 6,000+ gallons monthly.
Visible Pooling or Wet Spots in Your Yard
Soggy patches where water mysteriously pools indicate a burst or punctured supply line beneath the surface. You might also notice soggy soil that doesn't dry out, even on hot days, or standing water near your valve box.
These leaks accelerate soil erosion and create ideal conditions for root rot and fungal growth. Underground line repairs typically take 1–2 days and cost $300–$1,200 depending on the break's location and your yard layout.
Broken or Missing Sprinkler Heads
Mower damage, pets, or age can crack or snap sprinkler heads clean off. A missing head leaves a dry zone and disrupts water distribution to adjacent areas. Replacement heads cost $20–$50 each, plus $100–$200 in labor for installation and adjustments.
If you're replacing multiple heads, a professional can reprogram your controller zones to optimize coverage, which often saves money on water bills.
Water Running From Your Valve Box or Connections
Leaks at the valve box or where lines connect are red flags. This usually means a valve has failed, a fitting is loose, or a seal has deteriorated. Even slow drips waste thousands of gallons yearly.
Valve replacement typically costs $150–$400 per valve. Tighten fittings first to rule out simple looseness—this takes 15 minutes and costs nothing.
Your System Won't Turn On or Stays Running
Dead zones where nothing sprays, or heads that run continuously, point to controller problems or valve failures. A faulty controller often costs $100–$300 to replace. A stuck valve runs $150–$400 to repair or swap out.
If only one zone fails, the issue is usually isolated to that valve or its wiring. If the whole system is dead, suspect the controller or a tripped breaker first before calling a pro.
Higher Water Bills Without Explanation
A 15–25% spike in your water bill, especially during normal weather, almost always means a hidden leak. Your water company may provide leak detection tools or reports if you request one.
Track your water use month-to-month. A sudden jump warrants immediate investigation—early repairs prevent thousands in water waste.
Spring Startup Issues
At the start of irrigation season, winterization leftover water in lines can freeze and crack PVC pipes in cold climates. Broken pipes typically cost $300–$800 to replace. Have a professional blow out your system in fall and refill it properly in spring.
When to Call a Professional
DIY fixes work for minor issues like cleaning clogged heads or tightening loose fittings. Anything involving underground lines, valve replacement, controller programming, or backflow preventers requires licensed technicians who understand local plumbing codes.
A professional inspection costs $75–$150 but catches problems before they multiply. Services like Mercoly let you compare and hire trusted irrigation specialists in your area with verified reviews and upfront pricing.
Frequently Asked Questions
Q: How often should I have my sprinkler system professionally serviced? A: Spring startup and fall winterization inspections (twice yearly) are standard, plus an annual mid-season checkup to catch leaks or coverage gaps early.
Q: What's the difference between a repair and system replacement? A: Repairs address specific broken components ($150–$800 per issue), while full replacement ($3,000–$6,000+) makes sense if your system is 15+ years old or has multiple simultaneous failures.
Q: Do I need to turn off my system during winter? A: In climates below freezing, yes—water left in lines expands and cracks PVC pipes, so winterization (blowing out water and shutting down the controller) is essential every fall.
Get quotes from multiple local providers today to find the right fit for your system's needs.