Septic Tanks and the Threat
to Our Water Supply

The American Decentralized Wastewater Association (ADWA) is an organization developed especially for companies that manufacture and market wastewater treatment devices certified as meeting the most recent version of ANSI/NSF Standard 40.  It is the mission of ADWA to nurture the onsite wastewater treatment industry by promoting rules, standards, training, and related activities consistent with contemporary public health and environmental protection standards.