NSF/ANSI Standard 350: Certification for Water Reuse Treatment Systems
The industry standard for safe and sustainable water reuse.
NSF/ANSI 350 sets the benchmark for certifying water reuse treatment systems that process combined wastewater or greywater. This standard ensures systems meet strict health and safety requirements for non-potable water reuse applications.
What NSF/ANSI 350 covers
NSF verifies that all design and performance requirements are met and confirms through testing that treated water meets stringent quality criteria for its intended use. The standard establishes minimum material, design, construction, and performance requirements for onsite residential and commercial systems treating combined wastewater or greywater.
Why this standard matters
This innovative standard:
- Ensures water is treated to safe levels for non-potable reuse applications such as irrigation, toilet flushing and decorative fountains.
- Applies to any technology type capable of meeting requirements—no design limitations.
- Includes physical, chemical, and microbiological reduction requirements to protect public health and guarantee water quality.
Ready to learn more?
Discover what’s involved in the testing and certification process for NSF/ANSI 350.
Ready to Get Certified by NSF?
Start your certification journey today.
What’s New with NSF
Spritzer Becomes First Malaysian Bottled Water Brand Certified by NSF for Beverage Quality
May 21, 2026The leading Malaysian bottled water and beverages brand has earned NSF certification from ANSI-Accredited Product Certification Body – Accreditation #0216.
NSF Annual Review and Impact Report 2025 Now Live
April 20, 2026NSF has published its Annual Review and Impact Report 2025, detailing the organization’s progress over the past year and outlining strategic priorities for 2026.
Visit NSF at Making Pharma 2026
April 10, 2026Connect with our experts to discover how we help leading pharmaceutical and biotechnology companies achieve regulatory compliance and operational excellence.