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About This Item

 

Full Description

NSF/ANSI 40 is a standard for residential wastewater treatment systems with rated capacities between 400 and 1,500 gallons (1,514 and 5,678 liters) per day. We can evaluate any kind of system, regardless of treatment technology, in test facilities in the U.S., Canada and Europe.

To achieve certification, treatment systems must produce an acceptable quality of effluent during a six-month (26-week) test. Class I systems must achieve a 30-day average effluent quality of 25 mg/L CBOD5 and 30 mg/L TSS or less, and pH 6.0-9.0 spanning six months of testing. System service and maintenance are prohibited during the test period.
 

Document History

  1. NSF 40-2018

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    Residential Wastewater Treatment Systems

    • Most Recent
  2. NSF 40-2013


    Residential Wastewater Treatment Systems

    • Historical Version
  3. NSF 40-2012


    Residential Wastewater Treatment Systems

    • Historical Version
  4. NSF 40-2010


    Residential Wastewater Treatment Systems

    • Historical Version
  5. NSF 40-2009


    Residential Wastewater Treatment Systems

    • Historical Version
  6. NSF 40-2005


    Residential Wastewater Treatment Systems

    • Historical Version
  7. NSF 40-2004


    Residential Wastewater Treatment Systems

    • Historical Version
  8. NSF 40-2000


    Residential Wastewater Treatment Systems

    • Historical Version
  9. NSF 40-1999


    Residential Wastewater Treatment Systems

    • Historical Version