Be careful with filters-the main issue with lead is that it leaches from pipes and/or solder. Most of the cases I am aware of in modern (post 1970s) US homes were related to whole house reverse osmosis systems, because the ion-free water had so much more capacity for free metal ions.
If you have hard water, it is almost impossible to persuade lead out of the pipe into solution. If you do want to use a filter, make sure you have an at the tap point filter as well.