Onsite Residential and Commercial Water Reuse Systems
Innovative product designers, engineers, and manufacturers have begun developing onsite wastewater treatment technologies to treat and reuse wastewater. These decentralized treatment systems will offer a sustainable, energy-efficient, and practical solution for protecting our water supply.
Some feel uncertain and skeptical since these newer technologies are not widely known as an alternative to discharge-only systems. To help address the uncertainty and skepticism about these reuse systems, NSF/ANSI Standard 350: Onsite Residential and Commercial Water Reuse Treatment Systems was developed. This standard sets guidelines and requirements for treating onsite wastewater for reuse applications and methods to meet Log Reduction Targets (LRTs) to yield credits for viruses, bacteria, and protozoan removal. This is the first standard to comprehensively evaluate wastewater reuse technologies with water treatment quality criteria, public health initiatives, and environmental concerns in mind.
When certifying these types of technologies, NSF verifies that all design, construction, and performance requirements of the standard have been met through initial technical reviews, rigorous testing of influent /effluent, and inspection to ensure that the reused water meets stringent water quality criteria for its designated end uses.
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What’s New with NSF

iNADO Partners with NSF to Support Members and Athletes
May 27, 2026iNADO is pleased to welcome NSF’s expertise and experience in support of its members and the athletes they serve
NSF Ends UK’s Three-Year Testing Gap with REG 31 Testing Designation
May 20, 2026NSF’s Oakdale laboratory becomes the UK’s sole facility offering comprehensive BS 6920 and REG 31 testing, closing a critical drinking water safety gap.
Tangent® Materials Announces Industry First: Tangent PolySheet™ CB Earns Certification to NSF 537, Becoming the First PFAS-Free NSF Standard 51 Food Equipment Material
May 20, 2026New food-grade synthetic cutting-board sheet, engineered from the ground up without per- and polyfluoroalkyl substances (PFAS), establishes a new materialsafety benchmark for food-contact and food-equipment applications.
NSF Expands Food Equipment Portfolio with Electrical Safety Testing and Certification
April 30, 2026Manufacturers now have a “one-stop-shop” for both sanitation and electrical safety certification, enabling market expansion and regulatory compliance.