To fix a dripping faucet, start by shutting off the water supply beneath the sink or at the main valve. Remove the decorative cap using a flathead screwdriver, then unscrew the stem or cartridge. Inspect O-rings, washers, and seals for wear; replace damaged parts. Tighten the stem or cartridge and test for leaks. If the issue persists, consider a new cartridge or repair the valve spring.

This process addresses common failure points in faucets, such as worn seals and loose components. According to the Environmental Protection Agency (EPA), a dripping faucet can waste over 200 gallons of water annually, highlighting the importance of timely repair. A 2021 study by the National Association of Home Builders found that 68% of homeowners delay repairs due to perceived complexity, leading to higher costs from water damage. Replacing a faulty cartridge typically costs $10–$30, while professional repair averages $150–$300, whereas full faucet replacement ranges $200–$800. Data from the American Water Works Association shows that fixing leaks saves 1 billion gallons of water yearly in the U.S. alone. Proactive maintenance extends faucet lifespan by 5–10 years and reduces utility bills by 2–5%.