Search engines do not care for duplicative content, if you make multiple pages that have the exact same content on your website it can negatively effect your search engine position.  It probably won’t make much of a difference if it only happens on a couple pages of your website, but it could also be effecting how ‘link juice’ is passed between your pages.  If you have a contact.html page and a locations.html page a way to start to correct this is to do a 301 page permanently moved from locations.html to contact.html which will redirect the user to a different page and tell the search engine that the page has been moved / is the same page.

There is an easier way to do this now that does not require creating 301 redirects which can be a pain in the but sometimes.  All you need to do is add a new canonical tag in the pages header and it looks like this: < link rel=”canonical” href=”http://yourpage.com/locations.html”   / >

Add that to your contact.html page will let Google know it is the same as /locations.html.  This is now supported by Google, Yahoo and MSN.