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
NSF Issues First-Ever MSC Certification for an Eel Fishery to Perupez S.A.C. and Sakana del Peru
June 19, 2026Third-party certification plays a key role in independently verifying the sustainability of seafood operations.
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.