I ask that everyone please read this since it has implications for our entire nation, not just San Francisco. One commenter asked if I was talking about raw sludge here and said that treated (composted) sludge is better. I would like to clarify that I am ONLY talking about treated sludge. The test results I posted earlier were tests of the "organic compost" handed out by San Francisco to gardeners. And I'm getting my info directly from an EPA expert.