TABLE 1.

Part 503 pathogen density limits adapted from U.S. EPA, 2000

Pathogen or indicator and class	Standard density limit (dry wt)
Class A
Salmonellae	<3 MPN/4 g total solids or
Fecal coliforms	<1,000 MPN/gram and
Enteric viruses	<1 PFU/4 g total solids and
Viable helminth ova	<1 PFU/4 g total solids
Class B
Fecal coliform density	<2,000,000 MPN/g total solids