Tennessee Wastewater Operator Practice Exam

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What is the allowable limit for fecal coliform pathogen levels in class A biosolids before land application, according to 40 CFR part 503?

  1. 100 MPN per gram

  2. 500 MPN per gram

  3. 1,000 MPN per gram

  4. 10,000 MPN per gram

The correct answer is: 1,000 MPN per gram

Class A biosolids are treated to significantly reduce pathogens, making them safe for a variety of uses, including land application. According to 40 CFR part 503, the allowable limit for fecal coliform in Class A biosolids is set at 1,000 Most Probable Number (MPN) per gram of total solids. This standard ensures that the biosolids are low enough in pathogen levels to pose minimal risk to public health and the environment during land application. Meeting this criterion is critical for demonstrating compliance and ensuring that the biosolids are safe for use in agricultural applications or landscaping.

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