Sewage Sludge or “Biosolids.”

Image of a sewage plant.

Sewage sludge is what goes down the drain or toilet from home, hospitals and industries through a maze of sewer pipes and finally arrives at the wastewater treatment plant. The water is removed and what is left over is call sewage sludge or biosolids. Great name.


They have divided this muck into two groups.


Class A Biosolids. (No restrictions apply)

You as a home gardener can even buy this stuff at your local gardening store and grow your own food with it. (Yummy). Fertilize your lawn & plant boxes. I suggest you use gloves.

They have even come up with some great names. “Tegra” “GroCo” “Hou-Actinite” and“Milorganite”


You have to love those marketing geniuses. 

Class B Biosolids (Restrictions apply)


This is ok to used for fertilizer on crops used to feed animals.


Is it safe to use? Fine with the government.

Some items found in this stuff that regularly test positive for a cesspool of ingredients; are heavy metals, flame retardants, polycyclic aromatic hydrocarbons, pharmaceuticals, phthalates, dioxins, and a host of other chemicals and organisms. Of the thousands of contaminants that have been found in sludge, the U.S. government regulates exactly 10 of them.


Would I use this on my lawn? No, nope, notta, no way, don’t think so, not a chance, not even. And it smells bad.


For the whole story please visit:

United States Geological Survey


Scientist collected earthworms from a soybean field fertilized with biosolids. The earthworms were analyzed for 77 different chemicals; 20 chemicals were detected in the earthworms.


What is not known at present is the transport, fate, and potential ecological effects of these contaminants once biosolids are applied to agricultural fields, garden plots, and landscaped plants and shrubs.




United States Geological Survey



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