Why Water Damage Remains One of the Most Common Insurance Claims

March 4, 2026 Brian Meyer

Homeowners tend to worry about fires and break-ins. The data tells a different story. Year after year, water damage sits at or near the top of every home insurance claims report in the country, more frequent than theft, more costly than most expect, and often preventable. Understanding why it keeps happening is the first step toward making sure it does not happen to you.

The Numbers Are Hard to Ignore

Water damage is not a niche problem. One in 60 insured homes files a water damage or freezing claim each year, according to the Insurance Information Institute. It is the second most common homeowner insurance claim in the U.S., trailing only wind and hail damage.

The average water damage claim costs homeowners $13,954, and that figure only reflects what insurance covers. Out-of-pocket costs for deductibles, uncovered losses, and temporary housing push the real number considerably higher for many families.

Most of It Starts Inside the Home

Flooding from storms gets the most attention, but the majority of water damage claims have nothing to do with weather. They originate inside the home itself, from plumbing systems, appliances, and fixtures that fail quietly and without warning.

Plumbing failures and freezing are responsible for nearly half of all water damage claims, making them the single largest source of residential water loss. Burst pipes, failed supply lines behind washing machines and dishwashers, deteriorating toilet fittings, and slow leaks inside walls are among the most common culprits.

The insidious quality of interior water damage is that it often develops over weeks or months before becoming visible. By the time a stain appears on a ceiling or a floor begins to warp, the underlying damage is typically far more extensive than what the surface reveals.

Aging Infrastructure Plays a Major Role

The U.S. housing stock is old, and its plumbing reflects that. The median age of owner-occupied homes in the U.S. is now 40 years, according to U.S. Census data. Pipes installed in homes built in the 1970s, 1980s, and earlier were designed with a service life that many have already exceeded.

Galvanized steel pipes corrode from the inside out over decades, restricting flow and eventually failing. Polybutylene pipes, installed widely between the 1970s and mid-1990s, are prone to cracking and were the subject of a class-action settlement due to widespread failures. Even copper pipes, considered highly durable, are vulnerable to pinhole leaks caused by water chemistry and pressure fluctuations over time.

For plumbers who respond to these failures regularly, the pattern is familiar.

“A lot of the water damage we see isn’t caused by a dramatic event; it’s a slow leak that went unnoticed for months,” says Bradley Williford, owner of Rescue Hero Plumbing.”By the time a homeowner calls us, the water has already gotten into the walls, the subfloor, and sometimes the framing. The plumbing fix is quick. The restoration is what costs real money.”

Appliances Are a Frequently Overlooked Risk

Modern households run more water-connected appliances than any previous generation, including dishwashers, washing machines, refrigerators with ice makers, water heaters, and whole-home filtration systems. Each one represents a potential failure point.

Washing machine supply hose failures alone account for more than $150 million in property damage annually in the U.S. Water heaters are another significant source of loss. A standard water heater has a lifespan of 8 to 12 years, and units that operate beyond that window become significantly more likely to leak or rupture, often releasing 40 to 80 gallons of water directly onto a basement or utility room floor.

The risk is compounded by the fact that most homeowners do not track appliance age or inspect supply lines regularly. A braided stainless steel hose looks identical at year one and year twelve.

Climate Is Expanding the Problem

Interior plumbing failures have always driven claims volume, but weather-related water intrusion is growing as a contributing factor. Extreme precipitation events in the U.S. have increased in frequency and intensity over the past five decades, according to EPA climate indicators data.

Heavier rainfall overwhelms drainage systems, backs up into basements, and finds paths into homes through foundations, window wells, and aging rooflines. Flooding is now the most costly and common natural disaster in the U.S., according to FEMA, and standard homeowner insurance policies do not cover it, a gap that catches many property owners off guard when a claim is denied.

What Insurance Typically Covers and What It Does Not

Understanding the boundaries of a standard homeowner policy is critical because water damage coverage is more limited than most policyholders realize.

Covered: Sudden and accidental discharge, a pipe bursts, a supply hose fails, an appliance malfunctions unexpectedly.
Not covered: Gradual leaks, seepage, or damage that the insurer determines the homeowner should have known about and addressed.
Not covered: Flooding from external sources, including storm surge, overflowing rivers, and heavy rainfall runoff. This requires a separate flood insurance policy through FEMA’s National Flood Insurance Program or a private carrier.
Not covered: Sewer or drain backup unless a specific endorsement has been added to the policy.

Only about 4 percent of homeowners carry flood insurance, despite flood being the most prevalent natural disaster in the country. That gap between exposure and coverage is one of the primary reasons water damage remains so financially damaging for so many households.

Prevention Is Far Cheaper Than a Claim

The good news is that a meaningful share of water damage claims is preventable. A few consistent habits significantly reduce risk:

Know where your main shutoff is. In any water emergency, the ability to stop the flow immediately dramatically limits damage. Many homeowners do not know where their shutoff valve is located until they need it.
Inspect supply lines every year. Hoses behind washing machines, dishwashers, and refrigerators degrade over time. Replacing them proactively every five to seven years costs under $50 and eliminates one of the most common sources of catastrophic interior flooding.
Have your water heater inspected as it ages. Units beyond the 8 to 10 year mark warrant close attention. A licensed plumber can assess whether the anode rod, pressure relief valve, and tank integrity are still sound.
Install water leak detectors. Smart sensors placed near water heaters, washing machines, and under sinks cost $20 to $50 and can alert homeowners to moisture before visible damage occurs.
Review your policy annually. Confirm what your current policy covers, whether a sewer backup endorsement is in place, and whether your home’s flood risk warrants a separate policy.

The Bottom Line

Water damage keeps topping insurance claims reports because the conditions that cause it, aging pipes, unmonitored appliances, and homes that sit for hours or days unoccupied, are built into the way most people live. It is rarely dramatic, rarely predictable, and rarely caught early enough to avoid high cost.

Water damage and freezing claims account for roughly 29 percent of all homeowner insurance losses paid in the U.S. That share has remained stubbornly consistent for years. The households that break from that statistic are the ones that treat plumbing maintenance and policy review as routine, not something to get around to eventually.