NSF/ANSI/CAN 372 Technical Requirements
December 7, 2025
Minimizing lead content in drinking water system components.
NSF/ANSI/CAN 372: Drinking Water System Components – Lead Content is an American National Standard that provides a standardized methodology for determining and verifying product compliance to minimize lead contamination.
What the standard covers
NSF/ANSI/CAN 372 addresses lead content only. Most regulations also require compliance with an extraction or leaching test standard, such as:
- NSF/ANSI/CAN 61 for most products
- NSF/ANSI/CAN 42, 44, 53, 55, 58, or 62 for point-of-use and point-of-entry water treatment products.
Key technical requirements
- Maximum weighted lead content:
- 0.25% for most components
- 0.2% for solders and fluxes
- Weighted average formula for calculating lead content prior to testing
- Specific testing procedures for verifying compliance.
Products covered under NSF/ANSI/CAN 372
Multiple products that come into contact with drinking water can be tested to this standard, including:
- Coatings
- Valves
- Pipes
- Gaskets
- Solder and flux fittings
- Faucets
- Water filters
- Water softeners
- Reverse osmosis systems
- Ultraviolet reactors
- Water meters.
Ensure your products meet lead content requirements and protect public health.
How NSF Can Help You
Get in touch to find out how we can help you and your business thrive.
What’s New with NSF
CELSIUS® Products Earn NSF Certified for Sport® Certification
August 20, 2026CELSIUS® has earned NSF Certified for Sport® certification for select products, including the CELSIUS VIBES line, reinforcing the brand’s commitment to quality, transparency and consumer trust.
Thomas Vyles Honored With 2026 Walter F. Snyder Environmental Health Award
August 19, 2026The award honors Walter F. Snyder, co-founder and first executive director of NSF, and pioneers whose work advances environmental and public health.
NSF Hosts First External Review Panel for ‘NSF/KWTC 555’ with Key Asian Water Authorities
August 3, 2026Joint standard development gains momentum to enhance confidence in Asia’s water industry and advance drinking water safety.
NSF Achieves European Accreditation for Drinking Water Product Certification Ahead of 2027 EU Deadline
July 22, 2026The ISO/IEC 17065 accreditation from BELAC complements NSF’s testing capacity, enabling end-to-end support for EU Drinking Water Directive (DWD) readiness ahead of the January 2027 deadline.