plumbing what would cause sink faucet in bathroom to smell when water is running?

Not always put most of the time there is a bad odor when I run the faucett in the upstairs bathroom only.. what would cause this?

This entry was posted on Thursday, September 1st, 2011 at 8:42 pm and is filed under Bathroom Sink. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.