If your stem faucet drips when it's turned off, the washer, valve seat, or both probably need replacing.
Before you begin: Turn off the stop valve under the sink; turn on the faucet; protect chrome surfaces with electrician's tape.
If your faucet has a one-piece ball, cartridge, or valve, get replacement parts from your local plumbing supply or home improvement store.
Mr. Rooter Tip to count on
Tip #1 Pry the decorative cap from the handle, then, after removing the handle screw, lift off the handle. With an adjustable wrench, remove the packing nut. Pull out the stem, and replace the stem's bottom washer.
Tip #2 Run your little finger around the valve seat to see if it's chipped or worn. If you feel any roughness, remove the seat with a seat wrench, using the taper that matches the seat's hole (hexagonal or square). Replace it with a new valve seat.
Tip #3 Now before putting the faucet back together, make sure to coat all interior parts with heatproof, waterproof grease. In addition to its intended purpose, it makes for easy reassembly and a good seal.
If after attempting the DIY approach utilizing our handy tips but yet the problem still persists it might be time to call the team at Mr. Rooter Plumbing, your local and licensed Midland Park plumbing company.