scope:

This Standard provides site selection, field sampling, analytical, and statistical methods for evaluating the field performance of residential wastewater treatment systems capable of providing at least secondary treatment.

Only treatment systems that are certified in accordance with NSF/ANSI 40 or NSF/ANSI 245 as applicable may be evaluated under this Standard. A treatment system completing third-party testing in compliance with an evaluation, certification and listing protocol equivalent to NSF/ANSI 40 or NSF/ANSI 245 as applicable shall be acceptable, provided all data pursuant to the testing is published and the results verify that the device is capable of treatment as defined in NSF/ANSI 40 or NSF/ANSI 245 as applicable.