Look at our monitoring site viewer and see if we have gages and data for the area you are interested in. There is usually a report linked to each of these sites that will provide a lot of information about this data (results, analysis, etc.).
If you want to get detailed background (complete, non-analyzed) data for a particular site, or series of sites, please contact Rich Robinson by firstname.lastname@example.org or (512) 974-2394. Please allow up to 2 weeks for delivery.