Indiana Code Title 16. Health § 16-18-2-253.6

(1) “NSF/ANSI 40” refers to the standard of the American National Standards Institute and NSF International that establishes minimum:

for residential wastewater treatment systems;

(2) “NSF/ANSI 245” refers to the standard of the American National Standards Institute and NSF International that establishes total nitrogen reduction requirements for residential wastewater treatment systems with rated capacities of at least four hundred (400) but not more than one thousand five hundred (1,500) gallons per day; and

(3) “NSF/ANSI 350” refers to the standard of the American National Standards Institute and NSF International that establishes material, design, construction, and performance requirements for onsite residential and commercial water reuse treatment systems.