GroCo is a Seattle, WA product sold as fertilizer but made from sewage sludge. Hundreds of communities across the U.S. sell toxic sludge products that are typically renamed biosolids and sold or given away as "fertilizer" or "compost" (and often even labeled or marketed as "natural" or "organic").
GroCo is a Class A Biosolids product that incorporates sawdust. The concentrated sewage sludge itself is labeled Class B Biosolids and is marketed separately as a King County Wastewater Treatment Division product recently "branded" Loop. 310 wet tons a day of this sewage sludge are trucked from the wastewater treatment plant and then spread directly on agricultural cropland (80 percent) and commercial forest land (15 percent). The remaining five percent is made into GroCo.
According to one website:
- "King County operates several wastewater treatment plants in and around the Seattle, Washington area. Some of the biosolids from these plants are anaerobically-digested and dewatered to produce a biosolids "cake". The cake is either composted with sawdust to produce a product called GroCo or delivered directly to forest application sites as SilviGrow. King County has a long history of developing the SilviGrow program in association with the University of Washington College of Forest Resources. SilviGrow application to forest land is safe and beneficial. Trees fertilized with SilviGrow grow twice as fast as unfertilized trees. Thousands of forest land acres have been fertilized with SilviGrow.
- "Recently, King County has entered into a partnership with Washington DNR, University of Washington, Sierra Club, Weyerhaeuser, and others in what's called the "Mountains to Sound Re-Greening Program." This program involves hundreds of volunteers in the restoration and revegetation of logging roads no longer needed along the scenic Interstate 90 corridor from Puget Sound to the east side of the Cascades. GroCo is being used to restore revegetate the unsightly, barren scars left by many old logging roads."
Articles and Resources
Related SourceWatch Articles
- Sewage sludge
- Food Rights Network
- Sally Brown
- Sewage sludge giveaways, producers, and brands
- The EPA's plan to bypass opposition to sewage sludge disposal
- Water Environment Federation
- You say biosolids, I say sewage sludge
- Marie Kulick, Smart Guide on Sludge Use and Food Production, Institute for Agriculture and Trade Policy, 2008.
- Targeted National Sewage Sludge Survey: EPA-822-R-08-016 and EPA-822-R-08-018, EPA, January 2009.
- Environmental Working Group, Dumping Sewage Sludge On Organic Farms? Why USDA Should Just Say No, April, 1998.
- Environmental Working Group, Routes of Exposure sewage sludge: EWG Research on Chemicals in sewage sludge, April 30, 1998.
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