If you're faucet is making noise, it might be time to repair it. Does it make the noise when you turn it on and off? The answer could be as simple as flushing the lines. Lowe's provides this video on flushing the lines of your Delta bathroom faucet to silence the noise. You'll need a cloth, towel, 1/8" allen wrench, adjustable wrench, bucket or mixing bowl, white vinegar and an extra set of hands.