It is the responsibility of the Biosolids Generator (the City, Village, Township, County, LLC, etc. that generates the biosolids) to ensure that biosolids being land applied in Michigan are being handled in accordance with the Part 24 Rules and the approved Residual Management Program (RMP). Many Biosolids Generators hire third party contractors to handle, sample, and apply biosolids on behalf of the generator. It is the responsibility of anyone generating, treating, land applying or otherwise handling biosolids to be compliant with Part 24 rules.