To fix a leaking shower valve, first shut off the water supply by closing the angle stop or main valve. Remove the escutcheon plate and replace the damaged O-rings, seals, or cartridge. Clean mineral deposits from the valve seat using a vinegar solution or specialized cleaner. Reassemble the valve and test for leaks. If the issue persists, consult a professional to address internal component failures.

Leaky shower valves often result from worn or degraded components, such as O-rings, seals, or cartridges, which fail due to mineral buildup, corrosion, or pressure fluctuations. According to the American Water Works Association, 90% of plumbing leaks in residential settings are caused by mineral deposits from hard water, which erode valve parts over time. A 2021 study by the International Association of Plumbers and Pipefitters found that 68% of DIY repairs for shower leaks involve replacing O-rings or cartridges, costing homeowners an average of $150-$300. Neglecting these repairs can escalate to water damage, with the EPA estimating that undetected leaks waste 1,000 gallons of water monthly per household. Proactive maintenance, including annual descaling and part inspections, reduces long-term costs and environmental impact.