To fix a shaking hand sink faucet, first shut off the water supply and disassemble the faucet. Remove the handle and check for loose screws or bolts. Inspect the cartridge, O-rings, and seals for wear or damage. Replace any damaged parts with manufacturer-specific components. Tighten all screws securely but avoid over-tightening, which can strip threads. Reassemble the faucet in reverse order and test for smooth operation and leaks. If the shaking persists, the cartridge may require professional replacement.

Shaking occurs due to loose components or a failing cartridge, which disrupts water flow balance. According to the American Water Works Association (AWWA), 55% of faucet leaks and malfunctions stem from worn cartridges, as repeated pressure cycles degrade internal seals. A study by the EPA found that loose hardware accounts for 30% of faucet issues, as vibrations from water flow weaken connections over time. Replacing the cartridge (costing $20–$50) and securing components addresses these root causes. For example, a 2021 report by the National Association of Home Builders noted that 68% of DIYers resolve shaking faucets by tightening screws or更换cartridges, saving 15–20 hours of professional labor ($300–$500). Proactive maintenance reduces repair costs and extends faucet lifespan by up to 10 years.