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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 standardised methodology for determining and verifying product compliance to minimise 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:

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.

Download the NSF/ANSI/CAN 372 Technical Requirements Guide

Access key technical requirements for evaluating lead content compliance in drinking water system components.

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