Where can I find water and sewer discharge use characteristics per a
list of various land uses for communities in the southeastern US?

http://recenter.tamu.edu/search/webfind.asp This is the search page
for the Real Estate center at A & M.
I don't know if they have the information online. But here is where I
would go to try to find the information. Texas A& M offers a site for
research in a lot of areas.

This is from the Website on Texas A & M.
The "Texas Water Net" (http://twri.tamu.edu) 

Hope this helps.