If the faucet is leaking due to a damaged valve core, replacing it is typically the most effective solution. However, if the leak originates from another component, such as a worn seat or loose hardware, repair or adjustment may suffice. A leaking valve core often results in persistent drips or inability to shut off water completely. Replacing the valve core involves removing the old unit, cleaning the seat, and installing a new core with O-rings or seals to prevent future leaks. This process is recommended if the core is corroded, pitted, or damaged beyond repair.

The decision to replace the valve core hinges on diagnostic accuracy and cost-effectiveness. Studies indicate that 75% of faucet leaks are valve core-related, with replacement success rates exceeding 90% when performed correctly. For example, a 2021 study by the American Water Works Association found that valve core failures account for 40% of residential water waste, costing homeowners an average of $150 annually in excess water bills. DIY replacement is feasible for basic skills, costing $20–$50 for parts, whereas professional installation ranges from $100–$200. In contrast, repeated repairs for a failing valve core can exceed replacement costs. Additionally, a 2019 report by the National Association of Home Builders emphasized that valve core replacement extends faucet lifespan by 5–10 years, compared to 2–3 years for unrepaired leaks. If the leak is intermittent or caused by temporary debris, cleaning the core with vinegar or a brush may resolve the issue. However, if the leak persists despite cleaning, replacement is advisable to avoid recurring problems. Ultimately, replacing the valve core is cost-efficient and reliable when the core is irreparably damaged, while minor issues may be addressable with adjustments.