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Annual Plumbing Inspection Checklist for Homeowners

Last updated October 25, 2026

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The short answer

Why Annual Inspections Matter

Plumbing problems often start as slow drips or damp spots that go unnoticed for months. Over time, even a minor leak can soak drywall, warp flooring, and encourage mold growth. An annual check gives you a chance to find these issues while they are still easy to fix.

For homes in the Kirkland area, the mild marine climate with wet winters and dry summers means pipes can expand and contract with seasonal changes. That movement can loosen fittings or stress older joints. A yearly walkthrough helps you stay ahead of seasonal wear.

Check Visible Pipes and Fittings

Start with the pipes you can see: under sinks, in the basement, and around your water heater. Look for corrosion, mineral buildup, or small water stains on the pipe surface. Run your hand along the length to feel for dampness, and check the joints where pipes connect to fixtures.

Tighten any loose fittings with a wrench, but do not overtighten. If you spot a crack, a bulge, or a steady drip, that is a sign to call a plumber. For hidden leaks inside walls, a thermal imaging inspection can reveal temperature differences that suggest moisture.

  • Look for green or white corrosion on copper pipes
  • Check for water stains on cabinet floors under sinks
  • Feel pipe joints for any dampness or residue
  • Inspect flexible supply lines for kinks or wear
  • Look for rust or flaking on galvanized pipes
  • Note any unusual odors that could indicate stagnant water

Test Your Main Shutoff Valve

Your main shutoff valve is the one thing that stops all water flow to your home in an emergency. If you never touch it, the valve can seize up from mineral deposits. Test it once a year by turning it off and then on again, and make sure it moves smoothly.

If the valve is hard to turn or leaks when you operate it, have a plumber replace it. Also, find the valve now so you do not have to search during a pipe burst. Write down its location and keep the information handy for everyone in your household.

Inspect Water Heater and Connections

Your water heater is a common source of leaks, especially at the inlet and outlet connections and the pressure relief valve. Look for rust around the base, which can indicate a slow internal leak. Check the temperature and pressure valve for any signs of discharge, and make sure the drain pan is clear.

If you notice water pooling near the heater, shut off the water supply and call a plumber. A professional can determine whether the tank needs repair or replacement. While you are at it, check the flexible supply lines that connect to the heater for cracks or bulges.

Look for Signs of Hidden Leaks

Hidden leaks can cause significant damage before you notice them. During your annual inspection, look for water stains on ceilings, walls, or floors, especially near bathrooms, kitchens, and laundry areas. Feel for soft spots in drywall or flooring, and check for a musty odor that could signal mold.

If you suspect a hidden leak, a water damage inspection can help pinpoint the source without tearing into walls. In some cases, moisture mapping or leak detection services can locate the problem area. If you find mold, see a doctor if you feel unwell, and contact a mold professional for safe removal.

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Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

How often should I do a plumbing inspection?

Once a year is a good baseline for most homes. If you have older pipes, or if you have had a leak before, consider checking every six months. After a major storm or a freeze, do a quick visual check for new drips or damage.

Can I do the inspection myself or should I hire a pro?

You can do the visual checks yourself, like looking for stains and testing the shutoff valve. But for a thorough assessment, especially for hidden leaks, a plumber or a water damage pro can use specialized tools to find problems you might miss.

What should I do if I find a leak during the inspection?

Turn off the water supply to that fixture or the whole house if needed. For a small drip, tightening a fitting may help. For a larger leak or if you cannot stop the flow, call a plumber right away. If water has already soaked into walls or floors, contact a water damage pro to start drying and cleanup.

Call Now (425) 406-3256