tightening nuts

Step-by-Step

It may be that your faucet is not held tight against the sink. Get under your sink in as comfortable a position as possible, and tighten the mounting nuts. If you can't turn them with pliers, use a basin wrench (see Replacing Faucets, Related Projects). If this does not solve the problem, try Step 2.

stuffing putty

First try to fix the leak without removing the faucet. Loosen the mounting nuts enough to raise the faucet base about a half inch above the sink. Scrape out any hardened gunk. Holding the base plate just above the sink, stuff plumber's putty under it evenly. Retighten the mounting nuts. If it continues to leak, proceed to Step 3.

removing faucet

NOTE: Shut off the water, and drain the line. To entirely reseat the base plate, remove the faucet. Disconnect the supply lines, remove the mounting nuts, and pull out the faucet. Scrape any old putty away, and clean the area thoroughly. Take care not to scratch the sink.

replacing gasket

If the faucet has a gasket, throw it out, and replace it with a new one. If you have trouble finding a replacement, a new gasket can be made by purchasing a piece of rubber of a similar thickness. You can use the old gasket as a pattern, and cut out a new one.

applying putty

Many plumbers believe putty lasts longer than gaskets, so even if your faucet has a gasket, you may want to discard it and apply putty instead. Roll a rope of putty, about 1/4 inch in diameter, and apply it to the sink or to the underside of the faucet. Reinstall the faucet, and check for leaks.