7 Signs Your Irrigation System Needs Repair Before It Gets Worse

Irrigation system failures rarely happen all at once. They start small, a slight pressure drop, a wet spot that was not there before, a zone that runs a few minutes short. Catching these early warning signs prevents minor issues from becoming expensive emergencies.

Here are the seven most common signs your irrigation system needs repair.

Is Your Water Bill Suddenly Higher Than Normal?

An unexplained spike in your water bill is often the first indication of an irrigation leak. A single cracked mainline or stuck valve can waste hundreds or thousands of gallons per day without any visible sign above ground. If your water bill jumps 20 percent or more without a change in usage habits, your irrigation system should be the first thing you investigate.

What Causes Hidden Water Waste

• • Underground pipe leaks: PVC cracks from settling, root intrusion, or freeze damage can leak continuously underground
• • Stuck valves: A valve that does not fully close keeps water flowing to a zone 24 hours a day
• • Weeping heads: Sprinkler heads that dribble water after the zone shuts off waste water slowly but constantly
• • Controller malfunctions: A faulty controller may run zones longer than programmed or activate zones during rain

How to Investigate

Check your water meter when no water is being used in the house. If the meter is still moving, you have a leak somewhere. Shut off the irrigation system main valve. If the meter stops, the leak is in your irrigation system.

Are There Dry Spots or Brown Patches in Your Lawn?

Uneven coverage creates visible dry spots, brown patches, or areas of stressed turf while the rest of the lawn looks healthy. This is one of the most obvious signs of an irrigation problem and one of the most commonly ignored.

Common Causes of Dry Spots

• • Clogged nozzles: Dirt, sand, and mineral buildup restrict water flow through sprinkler heads
• • Misaligned heads: Heads that have shifted due to mowing, foot traffic, or settling spray water in the wrong direction
• • Low pressure in a zone: A leak or partially closed valve reduces pressure, shortening the throw distance of every head in that zone
• • Broken head: A head that does not pop up or does not rotate leaves a dead zone in coverage

What to Check

Run each zone manually and walk the entire coverage area. Look for heads that are not popping up, spraying in the wrong direction, or producing weak streams. Compare your observations to the system design to identify gaps.

Do You See Soggy Areas or Standing Water?

Persistently wet spots, especially when the system has not run recently, indicate a leak below ground or a drainage problem in the irrigation system. Soggy areas near valve boxes are particularly concerning because they often point to a cracked valve or fitting.

Why Soggy Spots Are Urgent

Standing water near your home's foundation can cause structural damage. In agricultural settings, waterlogged soil promotes root rot, reduces oxygen availability, and can kill crops. A single leaking joint on a 2-inch mainline can waste over 1,000 gallons per hour under pressure.

Where Leaks Commonly Occur

• • Pipe joints and fittings: The most common failure point, especially in older systems
• • Valve boxes: Connections to and from valves are under constant pressure stress
• • Around tree roots: Growing roots crack and displace pipes over time
• • Frost lines: In states like Nebraska, Kansas, Colorado, and Ohio, freeze-thaw cycles stress pipe joints

Is Your Water Pressure Lower Than Usual?

If sprinkler heads that once threw water 15 feet are now barely reaching 10 feet, you have a pressure problem. Reduced pressure affects every head in the system, creating gaps in coverage and requiring longer run times to deliver the same amount of water.

What Causes Pressure Drops

• • Main line leak: A crack or break in the supply line diverts water underground
• • Partially closed valve: The main shutoff or a zone valve may not be fully open
• • Clogged filter or backflow preventer: Debris accumulation restricts flow
• • Municipal supply changes: Your water provider may have reduced pressure in your area
• • Too many zones running simultaneously: System design may not support simultaneous operation

Pressure Testing

A simple pressure gauge on a hose bib near your irrigation connection point tells you your static pressure. Compare it to your system's design pressure. Residential systems typically need 40-60 PSI. Agricultural systems vary by design. If static pressure is normal but dynamic pressure (while running) drops significantly, the problem is in the system, not the supply.

Are Sprinkler Heads Damaged or Not Popping Up?

Sprinkler heads take a beating from mowers, vehicles, foot traffic, and weather. A head that is cracked, stuck down, or tilted cannot deliver water properly. In agricultural settings, damaged risers, broken nozzles, and worn pivot sprinkler packages waste water and reduce uniformity.

Types of Head Damage

• • Cracked body: The head may leak at the base even when the zone is off
• • Stuck retract spring: The head stays up after the zone stops, becoming a trip hazard and mower target
• • Broken or worn nozzle: Water pattern becomes irregular or produces misting instead of a solid stream
• • Tilted head: Settling or soil erosion tilts the head, directing water off target
• • Sunken head: The head sits below grade and cannot pop up fully, reducing its range

When to Repair vs Replace

Individual head replacement is inexpensive, typically $5-$30 for the part plus minimal labor. If more than 25 percent of heads in a zone are damaged, consider upgrading the entire zone to current technology heads with matched precipitation rates.

Does Your Controller Display Errors or Behave Erratically?

Modern irrigation controllers are reliable, but they do fail. An erratic controller can overwater, underwater, skip zones, or run at the wrong times. Older controllers are especially prone to electrical issues after power surges.

Common Controller Problems

• • Blank display or error codes: Power supply failure, blown fuse, or internal circuit damage
• • Zones not activating: Faulty solenoid, wiring damage between controller and valve, or bad zone output
• • Random activation: Electrical interference, lightning damage, or programming corruption
• • Clock drift: Controller time becomes inaccurate, running zones at wrong times of day

Controller Diagnostics

Test each zone by running it manually from the controller. If a zone does not activate from the controller but works when you manually open the valve, the problem is electrical, either the controller output, the wiring, or the solenoid. If the zone does not work manually either, the valve itself is the issue.

Is Your System More Than 15 Years Old Without an Upgrade?

Age alone is a risk factor. Irrigation components degrade over time, and technology has improved dramatically. A system installed 15 or more years ago likely has worn seals, degraded pipe, outdated heads, and an inefficient controller.

What Wears Out Over Time

• • PVC pipe: Becomes brittle after 15-20 years of UV exposure (above ground) or chemical degradation (below ground)
• • Polyethylene fittings: Compression fittings loosen over time from expansion and contraction cycles
• • Valve diaphragms: Rubber diaphragms harden and crack after 10-15 years, causing leaks or failure to open and close
• • Backflow preventers: Internal seals wear out and require rebuilding every 5-10 years
• • Wiring: Direct-burial wire insulation degrades, causing shorts and zone failures

The Case for System Audit

If your system is over 10 years old, a professional irrigation audit identifies failing components before they cause problems. An audit checks pressure, flow rates, coverage uniformity, and component condition. The cost of an audit ($150-$500 depending on system size) is a fraction of what emergency repairs cost when something fails mid-season.

When Should You Call a Professional?

Call for professional help when you notice any of the above signs, especially if you cannot identify the source of the problem. Underground leaks, electrical issues, and pressure problems require diagnostic tools and experience to locate and repair efficiently.

For agricultural systems, including center pivots, mainlines, and pump stations, annual professional inspections at the start of each irrigation season prevent costly mid-season failures when your crops depend on reliable water delivery.

The best time to repair an irrigation system is before the problem gets worse. The second best time is today.