Washing Machine & Water Heater Leaks: The #1 Cause of Indoor Water Damage

Appliance failures cause more indoor damage than storms

Monsoon storms get the attention, but a huge share of the indoor water damage calls we get trace back to two appliances: the washing machine and the water heater. Both involve a constant supply of pressurized water sitting on an aging rubber or metal connection, often in a laundry room or garage where a slow leak can run for hours — or days — before anyone notices.

Washing machine supply hoses

The rubber hoses that connect a washing machine to the wall are a wear item, not a permanent fixture — most manufacturers recommend replacing them every 3 to 5 years, and a lot of homeowners never do until one fails. Because the machine runs under full water pressure the entire time it's plugged in (not just during a wash cycle), a burst supply hose can dump a significant amount of water in a very short window, especially if it happens while no one's home.

• Check hoses for bulging, cracking, or a rusted metal fitting every few months.
• Braided stainless-steel replacement hoses hold up considerably longer than the basic rubber ones that ship with most machines.
• Turn off the water supply valves behind the machine when you'll be away for an extended period.

Water heaters

A residential water heater tank has a typical service life of roughly 8 to 12 years. Past that point, the tank itself is at rising risk of corroding through, and a full-tank failure means dozens of gallons released at once — usually in a garage or closet with limited containment, which is exactly why it tends to spread further than people expect.

1. Know your tank's age. It's usually on a sticker on the unit, or can be decoded from the serial number if not.
2. Watch for early signs. Rust-colored water, a popping/rumbling sound during heating (sediment buildup), or dampness around the base of the tank.
3. Consider a drip pan with a drain line if your water heater is on an upper floor or above finished living space below — it won't stop a leak, but it can buy critical time.

What to do the moment you find one

Shut off the water supply to the appliance first — the valve is usually right behind or beside it. For a water heater, also shut off power or gas to the unit before doing anything else. Then treat it like any other water event: document it with photos, and get extraction and drying started quickly rather than waiting to see how much dries on its own.

If a supply line or water heater has already flooded part of your home, our burst pipe repair page covers the restoration process in detail — the response is largely the same regardless of which appliance started it.

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