Bathroom & Kitchen High-Risk Plumbing Checklist (Printable Checklist)

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Bathroom & Kitchen High-Risk Plumbing Checklist

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Evidence-Based Drying Standards

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EPA & CDC Aligned Guidance

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Non-Commercial Educational Mission

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Electrical & Structural Safety First

Audience: Homeowners, Landlords, and Property Caretakers

Topic: Room-Specific Prevention

Reviewed: September 2026

A focused maintenance checklist targeting the two rooms responsible for over 70% of residential indoor water leaks and concealed moisture intrusion.

Bathroom: Toilets & Supply Connections

Perform a dye test on each toilet: place 3–4 drops of food coloring into the tank. If color appears in the bowl within 15 minutes without flushing, replace the flapper.Inspect flexible toilet supply tubes: replace stiff plastic tubes with braided stainless steel lines with metal nuts.Check toilet tank-to-bowl bolts and gasket for slow weeping onto the floor.Gently test toilet stability with your hand: if the toilet rocks or shifts, the wax ring seal may be broken, allowing wastewater to seep beneath flooring.Verify the shutoff valve (angle stop) behind the toilet turns freely and shuts off water completely when closed.

Bathroom: Tubs, Showers & Drains

Inspect perimeter caulk where the bathtub or shower pan meets floor tiles; scrape and replace mildewed, separated caulk with 100% silicone sealant.Check tile grout lines inside showers for cracking, crumbling, or hollow sounds when tapped, which indicates water penetration behind tile.Inspect showerhead and tub spout wall escutcheon plates to ensure caulk prevents water from spraying into wall cavities behind fixtures.Clean hair from drain strainers regularly to prevent slow drainage and backflow pressure against drain pipe slip joints.Check bathroom ceiling drywall for faint water rings or sagging joists directly beneath second-story showers.

Kitchen: Sinks, Disposals & Dishwashers

Inspect under the kitchen sink with a flashlight while running both faucets and the garbage disposal; look for drips at slip joints and basket strainers.Examine the flexible pull-out faucet hose under the sink; ensure it does not kink or abrade against shutoff valves when extended.Check garbage disposal housing for hairline cracks, rust along the bottom casing, or water leaking from electrical reset buttons.Inspect dishwasher supply and drain hoses for kinks, rubbing against cabinet cutouts, or clamps that have loosened.Ensure dishwasher drain hose loops up high beneath the countertop (high loop) or connects to an air gap to prevent wastewater backflow.

Kitchen: Refrigerators & Ice Makers

Pull refrigerator out carefully and inspect the plastic or copper supply line connecting to the rear water inlet valve.Replace brittle 1/4-inch plastic tubing with braided stainless steel or durable coiled copper line.Check inline refrigerator water filter cartridges for proper sealing and absence of hairline cracks on plastic filter housings.Inspect floor beneath the refrigerator for water stains, cupped wood planks, or sticky residue from defrost drain pan overflow.Clean refrigerator condenser coils and defrost drain tube annually to prevent condensation pan overflow.

Educational Guidance Notice: This website provides educational information on water intrusion, structural drying principles, and mold awareness. Content is not medical, legal, emergency dispatch, or licensed mold-remediation advice.