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More information that seems less emotional and reactionary:

http://www.epa.gov/agriculture/tfer.html

From YOUR link:

Dioxins. The EPA, in 1999, had originally proposed a TEQ limit of 300 parts per trillion (ppt or pg/g) in biosolids applied to land,

which is well above the means of 32 or 48 ppt detected in recent biosolids surveys.

Subsequent to the 1999 proposal, the EPA made a final decision

not to regulate dioxins in land-applied biosolids. After five years of study, which included outside peer review, the Agency determined that dioxins from this source do not pose a significant risk to human health or the environment *******