Home Water Damage Prevention Checklist: 25 Things to Do Before It Happens

Home Water Damage Prevention Checklist: 25 Things to Do

Seventy-five percent of homeowners will experience water damage at some point. Most incidents are preventable with regular maintenance. This checklist covers the areas most likely to cause problems, organized by how frequently each needs attention.

Plumbing Supply Lines (Annual Check)

1. Inspect washing machine hoses Rubber supply hoses degrade and fail without warning. Replace with braided stainless steel hoses — they last significantly longer and are less prone to burst failure. Check connections for bulging, cracking, or corrosion annually.

2. Check under all sinks Look for staining, mineral deposits, or soft cabinet wood indicating slow leaks. Check the P-trap connection, supply line connections, and drain basket gasket.

3. Test your water pressure Pressure above 80 PSI stresses pipes, fittings, and appliances. A water pressure gauge (under $20 at hardware stores) can verify this. High pressure is managed with a pressure-reducing valve (PRV).

4. Know where your main shutoff is — and test it Locate your main water shutoff and physically turn it off and back on annually. Gate valves that aren't operated regularly can seize. Know how to find and operate it in the dark.

5. Inspect visible pipes for corrosion Look for green staining (copper), white mineral crust, or orange rust (iron). These indicate corrosion and impending failure.

6. Insulate pipes in unconditioned spaces Pipes in exterior walls, crawl spaces, attics, and garages are freeze risk in cold climates. Foam pipe insulation reduces this risk significantly.

Water Heater (Annual + Periodic)

7. Check the temperature and pressure relief valve (annually) Manually actuate the T&P valve briefly to ensure it moves freely. A stuck T&P valve is a safety hazard. Replacement valves are inexpensive.

8. Inspect for rust and corrosion Look at the base of the tank, the fittings, and the area around the T&P valve. Any significant rust indicates pending failure. Plan replacement if your heater is 8+ years old.

9. Flush the tank (annually) Sediment buildup in the tank reduces efficiency and accelerates corrosion from inside. Connect a garden hose to the drain valve and flush several gallons until water runs clear.

10. Install a drain pan with leak sensor Water heater pan with a sensor that alerts you to early leakage prevents catastrophic failure discovery.

Appliances

11. Clean refrigerator water supply line Check the plastic or copper supply line to the icemaker/water dispenser. Plastic lines are brittle and can crack behind the refrigerator undetected.

12. Inspect dishwasher supply and drain connections Check where the dishwasher drain connects to the sink drain and the water supply connection under the sink. Tighten connections if any movement is present.

13. Check dishwasher door seal A cracked or hardened door gasket allows water to escape under the door during cycles. Replace if it doesn't make consistent contact.

Roof and Exterior (Twice Per Year)

14. Inspect roof for missing/damaged shingles after storms Even from the ground with binoculars, you can spot missing or curled shingles. At-grade inspection isn't necessary annually unless you suspect damage.

15. Check flashing at roof penetrations Chimney flashing, vent flashing, and skylights are among the most common roof leak sources. Any separation, rust, or sealant cracking needs attention.

16. Clean gutters and downspouts Clogged gutters overflow and direct water toward the foundation. Downspouts should extend at least 6 feet from the foundation or discharge to a splash block or underground drain.

17. Inspect window and door caulk Cracked exterior caulk allows water to enter wall cavities — this is an extremely common source of gradual leaks that go undetected for years.

Foundation and Drainage

18. Grade soil away from the foundation Soil should slope away from your home at least 1 inch per foot for the first 6 feet. Settled or flat grade directs stormwater toward the foundation wall.

19. Test sump pump operation Pour water into the sump pit to trigger the float switch. It should activate and pump quickly. Test the backup (battery or water-powered) as well. Replace batteries per manufacturer schedule.

20. Install a backup sump pump Primary sump pumps fail when you need them most — during major storms that also cause power outages. A battery backup or water-powered backup is inexpensive insurance.

Bathroom-Specific

21. Re-caulk around tubs, showers, and toilets (every 2–3 years) Silicone caulk around tubs and showers eventually cracks and allows water into the wall cavity behind tile. This is one of the most common hidden moisture damage sources.

22. Check toilet supply line and flapper The small plastic or metal supply line to the toilet is under constant pressure. Check for mineral crust, corrosion, or moisture at the connection. The flapper should create a complete seal — a running toilet wastes thousands of gallons and indicates a seal failure.

Technology

23. Install smart water leak detectors at high-risk points Detectors under sinks, behind appliances, near water heaters, and on basement floors provide early warning. Devices from brands like Flo by Moen, Phyn, or Govee can detect leaks in minutes rather than hours or days.

24. Consider a whole-home water shutoff device Automatic shutoff devices (Moen Flo, Phyn Plus) monitor flow patterns and can automatically cut water if a leak is detected. Particularly valuable for homes left empty for extended periods.

25. Document your home annually (for insurance purposes) Walk through your home annually with a phone video, documenting the condition of all rooms, appliances, systems, and contents. Store this video off-site (cloud storage). This documentation is invaluable for insurance claims.