Independent Scientific Testing Finds Toxic Contaminants in San Francisco’s Free ‘Organic Biosolids Compost’
Tuesday, August 10th, 2010
PBDE Flame Retardants and Triclosan Found in Tests Conducted for the Food Rights Network
Food Rights Network
John Stauber
[Note: for the obvious reasons articulated below sewage sludge is strictly prohibited in organic farm production]
San Francisco, CA: Independent tests of sewage sludge-derived compost from the Synagro CVC plant -- distributed free to gardeners since 2007 by the San Francisco Public Utilities Commission in their "organic biosolids compost" giveaway program -- have found appreciable concentrations of contaminants with endocrine-disruptive properties.
These contaminants include polybrominated diphenyl ether (PBDE) flame retardants, nonylphenol detergent breakdown products, and the antibacterial agent triclosan. The independent tests were conducted for the Food Rights Networkby Dr. Robert C. Hale of the Virginia Institute of Marine Sciences.
PBDEs are persistent and bioaccumulate in the environment, and elevated levels have been found in California citizens. The average total of the PBDE congeners tested in the compost was 731 ng/g (or ppb - parts per billion) (dry weight basis). The congeners found closely match those of the PentaBDE formulation, which are the congeners most commonly found in human tissue and wildlife. PentaBDE has been banned in Europe and its manufacture was voluntarily ended in the US in 2004, yet exposure continues.










