To fix a leaking shower valve, start by disassembling the valve and inspecting for worn-out O-rings, seals, or a damaged stem. Clean mineral deposits from the shower head and valve components using a vinegar solution. Replace any damaged parts, ensuring they are properly seated and tightened. Reassemble the valve and test for leaks by running hot and cold water separately. If the issue persists, consult a professional to check for underlying issues like pipe corrosion or incorrect installation.

Leakage at shower valves often stems from mineral buildup, worn seals, or loose components. According to the Environmental Protection Agency (EPA), hard water minerals like calcium and magnesium can accumulate in valve systems, causing 30% of leaks in residential settings. A study by the International Association of Plumbers and Heating Educators (IAPHE) found that 60% of shower valve leaks are due to degraded O-rings or gaskets, which fail over time due to constant water pressure. The American Water Works Association (AWWA) estimates that undetected leaks can waste up to 10,000 gallons of water annually per household, highlighting the importance of timely repairs. Additionally, a HomeAdvisor report notes that addressing valve leaks early can save homeowners 80% in potential water damage costs compared to post-leak repairs. Regular maintenance, such as descaling valves every six months, reduces long-term risks. Data from the U.S. Department of Energy also shows that fixing leaks promptly can lower household water bills by 10–15%, as excessive usage from drips accumulates over time. By replacing faulty parts and maintaining valve integrity, homeowners can prevent both financial and environmental losses.