5 Signs Your Irrigation System Needs a Repair (Before It Becomes a Big Problem)

By The Zone Guys · June 2026 · 6 min read

Most irrigation problems don't announce themselves loudly. They start as something you half-notice - a slightly soft spot in the yard, a zone that seems weaker than it used to, a water bill that's crept up without explanation. By the time it's obvious, the damage is usually done.

The good news is that most repairs are fast and inexpensive when caught early. The bad news is that the same problems, left alone, tend to compound. A slow leak under the soil that costs $150 to fix in May can turn into $400 of excavation and pipe replacement by August.

Here are the five signs we see most often - and what each one usually means.

Sign 1 Wet or Soggy Spots in Your Yard When the System Isn't Running

This is the one homeowners tend to rationalize away ("probably just ran recently" or "it rained last week"). But if you're seeing a consistently wet patch - especially one that's soft underfoot or stays wet for days - it's almost always a leak in the lateral line or a valve that isn't closing fully.

What's likely happening: A fitting has worked loose, a pipe has cracked from ground movement or frost, or a valve diaphragm has torn and is allowing water to seep through when the zone is off.

Why act fast: Underground leaks don't get better on their own. That water is going somewhere - into your soil, under your hardscaping, or toward your foundation. And it's showing up on your water bill whether you see it or not.

Quick test: Shut off all zones and check your water meter. Note the reading, don't run any water in the house for 30 minutes, check again. If the meter moved, you have a leak somewhere in the system.

Sign 2 Brown or Dead Patches That Don't Respond to Watering

A dead zone in your lawn usually points to one of two things: a zone valve that's failed (so that section isn't getting water at all), or one or more sprinkler heads in that area that are clogged, damaged, or aimed wrong.

Before you call a pro, do a quick zone-by-zone walk while your system runs. Watch where each head is spraying. You're looking for:

• Heads that aren't rising
• Heads spraying sideways instead of in their intended arc
• Sections of a zone where no heads seem to be covering
• A zone that runs on the controller but nothing happens in the yard

If it's one or two heads, that's a simple repair - clean or replace the heads. If an entire zone is dead and you can confirm the heads are fine, the valve or its wiring is the likely culprit.

Why act fast: Turf in New England is expensive to replace. A full summer of inadequate watering in one zone can kill a patch that takes a full season and real money to restore. Catching it in June is much better than diagnosing it in September.

Sign 3 Your Water Bill Has Spiked - and You Can't Explain It

This one often goes unattributed. Homeowners assume it's just summer usage, a hot stretch, or the bill being "off." But an unexplained jump in water usage - especially one that persists month to month - is one of the most reliable signals that something in your irrigation system is wrong.

What might be happening:

• A valve stuck in the open position is running a zone constantly, even at night
• An underground pipe leak is steadily bleeding water into the soil
• A broken head is spraying full-pressure water sideways instead of up, wasting the entire zone's output
• A zone is running more than it should due to a controller programming error

A valve stuck open is worth singling out: your system will run that zone on its normal schedule AND continuously between cycles. In a week, that can add thousands of gallons to your usage. We've seen water bills double in a single billing period from this alone.

Quick test: Go outside at night (or early morning) when your system should be off and listen. Any hissing, trickling, or wet ground near valve boxes is a strong signal. Also check if any zones are running when they shouldn't be.

Sign 4 Uneven Coverage - Some Areas Are Overwatered, Others Are Dry

Healthy irrigation coverage is invisible - your whole lawn looks even and you don't think about it. When you start noticing one section that's lush and almost swampy next to a dry brown patch, that's your system telling you something is out of balance.

Common causes:

• Head misalignment: Heads get bumped by mowers, foot traffic, or frost heave and end up pointed wrong. A rotary head aimed at the driveway instead of the lawn is wasting water and leaving your grass dry.
• Mismatched heads: If someone added heads to a zone over time without matching the original brand or arc/radius, coverage gaps and overlaps are inevitable.
• Pressure issues: Low pressure means heads in one zone aren't throwing far enough to reach their intended coverage area. High pressure causes misting - the spray atomizes and drifts instead of hitting the ground.
• Sunken heads: Heads that have settled below grade spray into the soil instead of over it.

Some of these are easy DIY fixes (realign a head, raise a sunken one). Pressure issues and mismatched coverage are trickier and usually worth having a pro assess, since getting it wrong means the problem just shifts around the yard.

Sign 5 The System Is Behaving Erratically - Wrong Zones Running, Skipping Schedules, or Not Responding

If your system is running zones out of order, skipping scheduled cycles, running at the wrong times, or not responding to the controller, the issue is usually electrical - a wiring fault between the controller and a zone valve, or a controller that's starting to fail.

What erratic behavior usually means:

• A zone that won't turn on: Likely a wiring break, a blown solenoid on the valve, or a bad connection at the controller terminal
• A zone that won't turn off: Valve diaphragm failure or debris stuck in the valve seat - water pressure is holding it open
• Wrong zones activating: Wiring cross or a short, usually from a nick in the wire underground
• Controller not responding: Power issue, failed transformer, or the controller itself is done

Wiring and valve electrical issues are firmly in "call a pro" territory. The wiring runs underground, and diagnosing a short without a multimeter and the right test sequence usually means pulling wire until you find it - which is a lot harder than it sounds.

How to Know When to Call vs. Wait

If you're in Metro West and unsure what you're dealing with, we're happy to take a look. Our repair visits include a full diagnosis - we'll tell you exactly what's wrong and what it'll cost before we touch anything. No runaround, no upsell.