NSF/ANSI/CAN 372 Technical Requirements
December 7, 2025
Minimising 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.
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