Originally posted by AmukWe have took samples of both the sludge, our water and the water from our lake and sent them to the county and
state and are awaiting replies.

Take them to a university or even a contact some of the local high school chemistry teachers. They might be able to do some very simply tests for
obvious toxins and oddities and the like.
Indeed, you
could, in theory, perform some tests yourself, but this might be quicker and more effective and not invovle buying glassware and
chemicals and whatnot.
edit to add
(no, i don't have to read a significant portion of a thread before I respond!

)

a mix of stagnant water and clay

Just for kix, the clay should settle out if you put it in a jar. Might take a while, but it will. Might be worth trying.
[edit on 3-6-2005 by Nygdan]