Links

Most states and counties will require that an alternative residential wastewater treatment system be certified in accordance with NSF/ANSI Standard 40. For consumer information and a list of companies and products certified to this standard, please visit the following links:

Consolidated Treatment Systems

Norweco, Inc.

Pentair Incorporated

Bio-Microbics, Inc.

Wastewater Treatment Units Online Product Database

For additional information on wastewater at the national level:

National Onsite Wastewater Recycling Association

United States Environmental Protection Agency

Natural Resources Conservation Service