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NSF logoMore than 97 percent of water on earth is salty and nearly 2 percent is locked up in snow and ice. That leaves less than 1 percent of water to grow crops, cool power plants and supply drinking and household water. Governments, NGOs, residential and commercial builders and architects are turning to onsite wastewater reuse systems as a solution to increasing water scarcity and energy costs associated with the treatment and distribution of municipal water and wastewater.

NSF/ANSI Standard 350 and 350-1 establish material, design, construction and performance requirements for onsite residential and commercial water reuse treatment systems. They also set water quality requirements for the reduction of chemical and microbiological contaminants for non-potable water use. Treated wastewater (i.e. treated effluent) can be used for restricted indoor water use, such as toilet and urinal flushing, and outdoor unrestricted water use, such as lawn irrigation.

Residential or Commercial (non-industrial) onsite graywater and blackwater treatment systems that serve single or multiple buildings within the same property Residential systems are defined as those that treat wastewater from a single residence. Commercial systems are those that treat wastewater from multi-family dwellings and from businesses such as

  • Lodging establishments
  • Business parks and campuses
  • Shopping facilities
  • Laundering facilities for hospitals, hotels, rental uniforms, etc.
  • Car wash facilities


The water reuse standards build on previous NSF onsite wastewater treatment standards. The table below compares the NSF350 standard to NSF/ANSI Standards 40 and 245, both for residential wastewater treatment applications Each subsequent standard builds on the prior one, adding additional testing requirements The NSF/ANSI 350 standards require the same testing as the prior standards, but add tests for turbidity and bacteria (e-coli):


For more information on NSF/ANSI 350, call +1 734.476.2543 or email

Bio-Microbics Listings on NSF website

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