it depends on Where it is leaking from and who the manufacturer is. Moen will replace your cartridge and or faucet for free as they have a lifetime warranty. if it dripping Under the sink you could have a bad valve which means that the entire faucet will need replaced. if it is dripping from the spout it is most likely the cartridge which can be repaired or replaced without having to remove the entire faucet. contact the manufacturer.
TIME for a replacement
Faucet Drips or Leaks-- General Faucets are used so much that it
There are a number of online websites where one can purchase replacement parts for a Delta faucet. Some of these websites include Delta, Faucet Depot and Amazon.
Price Pfister faucet replacement parts are available at the Faucet Direct website. Faucet direct has an easy to navigate web page that will help you find what you need.
Thaw it out and check for cracks or leaks
You have a leak between the diverter and showerhead or the arm for the showerhead is not sealed properly into the fitting in the wall
Rubber bushings inside the faucet are worn. Replacement kits at local home stores for around $7.
check for leaks
Delta faucet parts are available directly from Delta or from Home Depot, E Replacement Parts, Amazon, eFaucets, Lowe's, Hardware World, and Faucet Depot.
"Make sure you have the correct sized faucet and the correct tools. Turn off your water and then remove the existing faucet. Replace it with the new one, making sure it is sealed so that no leaks can occur when you turn your water back on."
A lifetime warranty only lasts for the life of the company that sold you the faucet and may not cover every component of the faucet. In general, if you have the warranty you can send the faucet back and they will send you a new one provided that the defect is covered. (Some leaks, however, may be caused by things other than the faucet itself.)
You could visit a hardware store and ask about your options depending on your faucet. If you want to try a different faucet, ask if it would be easy to install it even if its different