To replace a leaking water pipe in a faucet, follow these steps: Turn off the water supply by closing the shut-off valve beneath the sink. Disassemble the faucet by unscrewing the base and removing the stem or cartridge. Inspect the worn-out O-rings, seals, or the stem itself. Replace these parts with new ones designed for the faucet model. Apply plumber’s grease to the stem threads and O-rings to ensure a watertight seal. Reassemble the faucet, testing for leaks by running water and tightening components as needed. Use an adjustable wrench and screwdriver for disassembly and assembly.

This process addresses leaks caused by worn internal components like O-rings or a damaged stem, which are common in faucets due to mineral buildup, corrosion, or age. According to the Environmental Protection Agency (EPA), a single dripping faucet can waste over 10,000 gallons of water annually, contributing to household water waste. Replacing faulty parts is cost-effective, with materials averaging $20–$50, compared to $200+ for professional repair. The EPA also notes that 55% of leaks in older faucets stem from worn seals, making proactive replacement critical. Additionally, a study by the American Water Works Association found that DIY faucet repairs reduce long-term water bills by up to 15%, as continuous leaks can spike usage. Regular maintenance, including annual inspections and part replacement, extends faucet lifespan and minimizes environmental impact.