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WATER DAMAGE · 5 MIN READ

What Causes Water Damage? A Homeowner's Guide

Most water damage doesn’t start with a dramatic flood. It starts small: a slow drip under the sink, a hairline crack in a supply line, a washing machine hose that’s a few years past its prime. By the time you notice a stain on the ceiling or a soft spot in the floor, the damage has usually been building for weeks or months.

What's the most common cause of water damage in a home?

Water damage most commonly comes from plumbing failures (burst or leaking pipes, failed supply lines), appliance malfunctions (water heaters, washing machines, dishwashers), roof and foundation leaks, HVAC condensation issues, and sewage backups. Slow leaks are the most costly because they go undetected the longest. Catching the early signs, and knowing when to call for water cleanup versus full water damage restoration, can save thousands in repair costs.

Water heater failure40–60 gal in minutes
Replace supply hosesEvery 5 yrs
Water heater lifespan10–12 yrs
Avg. crew arrival~2 hrs

Common Causes

The 6 Things Most Likely to Cause Water Damage in Your Home

Skim the causes below, then jump to any section for the full details on what to watch for. The most expensive damage almost always comes from the one you catch last.

1

Plumbing Failures

The #1 cause of residential water damage.

2

Appliance & Fixture Failures

Water heaters, washers, dishwashers, ice makers.

3

Roof, Gutter & Foundation Leaks

Water gets in without any plumbing failure at all.

4

HVAC & Condensation Issues

Drips steadily for months without ever puddling.

5

Sewage Backups

A biohazard, not just a water problem.

6

How to Spot It Before It Spreads

The checks that catch most problems early.

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Does insurance cover this?

See how coverage works and what to document for your claim.

Common Cause #1

Plumbing Failures: The #1 Cause of Water Damage

Burst pipes, corroded fittings, and failed supply lines behind toilets, sinks, and washing machines account for the majority of residential water damage claims. Older homes in Sonoma and Marin County with original copper or galvanized plumbing are especially prone to slow leaks as pipes age and corrode from the inside out.

  • Watch for unexplained increases in your water bill.
  • Check if your water meter keeps moving when everything in the house is off.
  • Notice a faint musty smell near walls and cabinets? Investigate right away.

Common Cause #2

Appliance and Fixture Failures

Water heaters, washing machines, dishwashers, and refrigerator ice makers are common sources of sudden water damage, especially once they’re past the 8-10 year mark. A failed water heater tank alone can release 40-60 gallons in minutes. Replace rubber supply hoses on washing machines with braided stainless steel every 5 years, check under sinks and behind appliances quarterly for early moisture or corrosion, and know your water heater’s age — most manufacturers recommend replacement at 10-12 years.

Common Cause #3

Roof, Gutter, and Foundation Leaks

Water doesn’t need a plumbing failure to get in. Damaged roof flashing, clogged gutters, and poor grading around the foundation let rainwater and runoff work their way into walls, attics, and crawl spaces, sometimes for an entire rainy season before anyone notices. This is especially relevant heading into storm season in Sonoma and Marin County, where older homes with crawl space foundations are prone to standing water in a crawl space when grading and drainage haven’t kept up with the house.

Common Cause #4

HVAC and Condensation Issues

Clogged condensate drain lines on air conditioning units and poorly insulated ductwork in attics or crawl spaces can drip water steadily for months. It’s one of the most overlooked causes because it rarely announces itself with a puddle, just a slow-growing stain or a musty smell.

Common Cause #5

Sewage Backups: A Different Kind of Water Damage

Sewage backups deserve their own category because they’re a biohazard, not just a water problem. Tree roots, aging municipal lines, and heavy storm flow can push sewage back into a home through drains or toilets. This requires professional sewage damage cleanup, not a mop and a fan — contaminated water needs to be extracted and the area disinfected by a certified crew.

  • Water cleanup handles a small, contained spill you catch quickly.
  • Water damage restoration covers anything soaked into flooring, drywall, or subfloor.
  • If water sat for more than a couple hours, or traveled somewhere you can’t see, treat it as a restoration job.

Prevention Checklist

How to Spot Water Damage Before It Spreads

Most of these causes give off warning signs well before you’d notice a stain or a puddle. Making a quick check part of your routine — monthly under sinks and behind appliances, twice a year in the attic and crawl space — catches the majority of problems while they’re still a cleanup instead of a restoration: peeling paint or bubbling drywall near a wall, an appliance approaching or past its expected lifespan, gutters that overflow instead of draining away from the foundation, or a crawl space that smells musty even when it looks dry.

Coverage Question

How Do I Know If Water Damage Is Covered by Insurance?

Most homeowners policies cover sudden, accidental water damage, like a pipe that bursts without warning, but they generally exclude damage from long-term leaks the homeowner should have caught and maintained, as well as flooding from external sources like storm surge. This is why catching the early signs matters just as much for your wallet as it does for your home: a claim for a sudden pipe burst looks very different to an adjuster than months of unaddressed slow leaking.

Need Help Understanding Your Coverage?

Bravo Restoration works directly with your adjuster and can help flag early on whether your claim needs to reflect a sudden failure versus a maintenance issue.

Most homeowners policies cover sudden, accidental water damage, like a pipe that bursts without warning, but they generally exclude damage from long-term leaks the homeowner should have caught and maintained, as well as flooding from external sources like storm surge. Catching the early signs matters just as much for your wallet as it does for your home.

Water cleanup usually refers to addressing a small, contained spill or leak you catch quickly. Water damage restoration is the broader process for anything that’s soaked into flooring, drywall, or subfloor: water extraction, dehumidification, and repair of any structural or cosmetic damage. The line between the two comes down to how long water sat and how far it traveled.

Most manufacturers recommend replacing a water heater at 10-12 years old, and units past the 8-10 year mark are more likely to fail suddenly. A failed tank can release 40-60 gallons in minutes, so knowing your water heater’s age and watching for rust or moisture around the base is worth doing before it becomes an emergency.

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