: What would cause a faucet to run in the sink? On a couple of occassions, I thought the running water/sink was turned off after use. But, it's been on and running water when I went back in the bathroom.
On some faucets, especially American Standard with aqua seal washers will sometimes turn on by themselves.
The best way to handle it if you have this type of faucet would be to replace the stems with regular washer style stems with bibb screws. If you have another brand, tightening any loose parts or replacing the stems may help as well.
Good Luck. e-plumber