EPA has determined that the human body should not be labeled or considered 'solid waste.' Therefore, human crematories are not solid waste combustion units, and are not a subcategory of OSWI for regulation. Animal crematories are also excluded from this rule.
See: Final Rule for Standards of Performance for New Stationary Sources and Emission Guidelines for Existing Sources: Other Solid Waste Incineration Units, issued in a Federal Register notice on December 16, 2005 (56 pp, 933K, About PDF)
Most states have a licensing board that regulates the funeral industry. You may contact the board in your state for information or help. In some states, the State Board of Mortuary Arts or Department of Health & Environment may address this kind of issue. Some cities and towns have ordinances also.
For more information you can contact or consult:
Pathological waste means waste material consisting of only human or animal remains, anatomical parts, and/or tissue, the bags/containers used to collect and transport the waste material, and animal bedding (if applicable). For rules for pathological waste incinerators, see: Rule and Implementation Information for Other Solid Waste Incinerators