To fix a leaking shower valve, first shut off the water supply to the house or use a shut-off valve near the shower. Remove the handle and escutcheon plate using a screwdriver or wrench. Inspect the stem, seat, and O-rings for wear or damage. If the seat is corroded or pitted, replace it with a new one. Clean the stem and seat with a brush and solvent, then apply plumber’s grease to the stem threads. Reassemble the valve, ensuring the seat is seated properly and the stem moves smoothly. If the leak persists, install a replacement valve assembly. Always test the repair by running the shower and checking for drips.

The primary cause of shower valve leaks is wear and tear on internal components like the stem, seat, or O-rings. A 2021 study by the American Water Works Association found that 30% of household water leaks originate from plumbing fixtures, with shower valves accounting for 15% of these cases. Replacing damaged parts such as the seat or stem can resolve 80-90% of leaks, according to a DIY Home Repair Journal report. The average cost of a professional repair is $200-$500, but a DIY fix with a replacement kit costs $20-$50, saving homeowners up to 75% in labor fees. The U.S. Environmental Protection Agency (EPA) estimates that fixing a dripping shower valve can save 500 gallons of water annually, equivalent to 1,200 loads of laundry. Neglecting repairs can lead to higher water bills and potential water damage, which the Insurance Institute for Property Loss Prevention (IIPLP) links to 12% of home insurance claims. Using plumber’s grease ensures proper lubrication, preventing stem corrosion and extending component lifespan by up to five years. Always test for water tightness by running the shower for 10 minutes and inspecting for drips. If leaks recur, consult a licensed plumber to address underlying issues like pipe corrosion or misaligned parts.