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Are there different grades or classes of biosolids?

April 26, 2017biosolids classes different grades

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Are there different grades or classes of biosolids?

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Yes, EPA established both “Class A” and “Class B” biosolids. Class A biosolids contain no detectible levels of pathogens. Class B biosolids are treated but have detectible levels of pathogens. Different rules apply to the classes. For example, buffer requirements and public access and crop harvesting restrictions apply to Class B biosolids.