Since the 1970s, we have begun to move away from working solely to dispose of onsite wastewater and toward a focus on treatment prior to dispersal into the environment. This leads to safer and healthier environments as BOD, turbidity and nitrogen are reduced. Additionally, with water demands rising, the implementation of reuse systems has become significant. NSF standards are developed to help ensure that treatment technologies and systems are designed and function to safely and effectively treat onsite wastewater. This presentation aims to increase attendees' knowledge of NSF/ANSI 40 (onsite treatment), NSF/ANSI 245 (nitrogen reduction) and NSF/ANSI 350 (water reuse). The standards and certification process will be discussed, including performance testing details such as influent and effluent characteristics, dosing volume, sampling days, and stress loading.