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NSF/ANSI 40: Residential Onsite Systems -NSF International Page 1 of 3 <br /> NSF International - The Public Health and Safety Organization <br /> NSF/ANSI 40: Residential Onsite Systems <br /> NSF/ANSI 40 is a standard for residential wastewater treatment systems with <br /> rated capacities between 40o and 1,500 gallons (1,514 and 5,678 liters) per day. We <br /> can evaluate any kind of system, regardless of treatment technology, in test <br /> facilities in the U.S., Canada and Europe. <br /> To achieve certification, treatment systems must produce an acceptable quality of <br /> effluent during a six-month (26-week) test. Class I systems must achieve a 3o-day <br /> average effluent quality of 25 mg/L CBOD5 and 30 mg/L TSS or less, and pH <br /> 6.o-g.o spanning six months of testing. System service and maintenance are <br /> prohibited during the test period. <br /> Testing Process <br /> Wastewater of required strength is introduced to the treatment system at the rated <br /> system capacity in even doses at prescribed periods. Stress sequences simulate <br /> wash day, working parent, power outage and vacation scenarios. <br /> The effluent criteria required of a Class I system is based on the U.S. EPA <br /> secondary effluent treatment requirements for municipal treatment facilities. <br /> In addition to effluent performance, requirements also exist for product literature, <br /> including installation, operation, maintenance, troubleshooting and repair <br /> manuals. The system must also meet minimum requirements for structural <br /> integrity, leakage, noise, electrical certification, access ports, failure sensing and <br /> signaling equipment (visual and audible alarms), flow design, data plate and <br /> service labels. <br /> Benefits of Certification <br /> NSF/ANSI 40 is the most recognized and required standard for the residential <br /> wastewater treatment industry with more than 30 years of market use and <br /> acceptance. Certification to NSF/ANSI 40 provides your company access to the <br /> onsite residential wastewater market. <br /> http://www.nsf.org/services/by-industry/water-wastewater/onsite-wastewater/residential-wastewater-tr... 11/9/2018 <br />