Don't know Lynda. Pesonally I believe using treated lumber would add neglible amounts of arsenic to the water but I really don't know. I do know some of the fertilizers they use on those golf course like lawns on lakes around here have got to end up in the lake from time to time. One lake near me that used to have cisco and lake trout now has marginal oxygen levels late in the summer. Nitrate levels are through the roof and I'm sure man made activities including a nearby hog farm have something to do with rapidly increased eutrophication.
