NSF Protocol 534 – Certified Once. Trusted Throughout the Supply Chain
Create reusable compliance building blocks that help suppliers demonstrate compliance readiness and support manufacturers on their path toward final product conformity assessment.
As EU Minimum Hygiene Requirements (EU-MHR) become mandatory, manufacturers and suppliers face increasing pressure to demonstrate compliance throughout the drinking water supply chain. Yet many of the formulations and non-final materials used to manufacture drinking water products, such as granulates, compounds, additives, coatings, pre-products and intermediate products, are not directly addressed by the conformity assessment framework for final drinking water products.
NSF Protocol 534 was developed for formulations and non-final materials that support drinking water applications but are not themselves final drinking water products. It provides an independent assessment pathway that may result in certification of eligible formulations, materials and products, helping suppliers demonstrate readiness for EU drinking water compliance requirements and helping manufacturers support their path toward final product conformity.
The challenge
Without an independent assessment of supplier formulations and non-final materials, the same information may need to be reviewed repeatedly throughout the supply chain.
This can create:
- Repeated supplier questionnaires.
- Multiple data requests from customers and certification bodies.
- Duplicate assessments and testing.
- Longer certification timelines.
- Increased compliance costs.
- Supply chain uncertainty.
For both suppliers and manufacturers, these activities can consume significant time and resources while slowing down the path to market.
The NSF solution
Reusable compliance building blocks
Think of Protocol 534 as a reusable building-block certification.
Rather than repeatedly evaluating the same formulation or non-final material as it moves through the supply chain, Protocol 534 provides an independent assessment and supporting documentation that may be leveraged across multiple final product manufacturers and conformity assessment activities.
How it works
- 1
Submission and assessment
A supplier submits a formulation, pre-product, intermediate product, constituent product, or site-applied material evaluation. Technical information is reviewed to determine the applicable drinking water requirements and assessment scope.
- 2
Independent evaluation
NSF conducts an independent review that may include formulation review, evaluation against applicable requirements, migration assessment, and testing, depending on the type of formulation or non-final material being assessed.
- 3
Protocol 534 certification
A Protocol 534 certificate is issued for the evaluated formulation or non-final material.
- 4
Reuse across multiple products
Multiple manufacturers can incorporate the Protocol 534-certified non-final material into their final drinking water products. The assessment and supporting documentation can serve as reusable compliance building blocks that help reduce duplicate reviews of supplier information across the supply chain.
- 5
Final product conformity assessment
Final drinking water products still undergo their own required conformity assessment procedures. Protocol 534 does not replace final product conformity assessment, but it can help reduce uncertainty by providing an independent review of formulations, materials and supporting compliance information before final product assessment.
The result
Certified once. Trusted throughout the supply chain.
A single Protocol 534-certified formulation or non-final material can become a reusable compliance building block that supports multiple manufacturers, final drinking water products, and conformity assessment activities.
Benefits for material suppliers
Turn compliance into commercial value
Protocol 534 helps suppliers demonstrate that their formulations and non-final materials have been independently assessed while creating value for customers that use them in final drinking water products.
Benefits include:
- Differentiate your formulations and non-final materials through independent third-party assessment and certification.
- Support customer compliance activities.
- Reduce repeated information requests.
- Minimize disclosure of proprietary formulation information.
- Increase visibility and credibility in the market.
- Demonstrate readiness for evolving EU drinking water requirements.
Benefits for final product manufacturers
Save time. Reduce uncertainty.
By encouraging suppliers of formulations and non-final materials to obtain Protocol 534 certification, final product manufacturers can:
- Reduce duplication of supplier reviews.
- Simplify supplier qualification.
- Increase confidence in assessed formulations and non-final materials.
- Help identify compliance considerations earlier in the process.
- Improved supply-chain efficiency.
What can be evaluated and certified under Protocol 534?
Protocol 534 provides certification pathways for both formulations and non-final materials used in the manufacture of drinking water products.
- Formulations.
- Pre-products.
- Intermediate products.
- Constituent products.
- Site-applied materials.
These formulations and non-final materials are used to manufacture drinking water products but are not themselves final drinking water products.
Frequently Asked Questions
Does Protocol 534 replace final product certification?
No. Final drinking water products must still undergo the applicable conformity assessment procedures required under the EU-MHR framework. Protocol 534 supports that process by providing independently assessed formulations and non-final materials that may be leveraged during final product conformity assessment activities.
How does Protocol 534 relate to the European Positive Lists?
Where applicable, Protocol 534 includes formulation review against relevant European Positive Lists. However, Protocol 534 extends beyond Positive List verification by combining formulation review, testing, assessment, and documentation into a framework that supports broader compliance objectives.
How does Protocol 534 protect confidential formulations?
Formulations can be reviewed by an independent certification body without requiring disclosure of confidential formulation details to customers or product manufacturers, helping protect intellectual property while supporting compliance activities.
Does Protocol 534 include testing?
Depending on the formulation or non-final material and its intended application, Protocol 534 may include formulation review, migration assessment, testing, and evaluation against applicable drinking water requirements and acceptance criteria.
How long is certification valid?
Protocol 534 certificates are valid for five years, subject to ongoing compliance and applicable certification requirements.
Building compliance from the ground up
EU-MHR conformity assessment focuses on final drinking water products. Protocol 534 focuses on the formulations and non-final materials that help build them. By creating reusable compliance building blocks that can be leveraged across the supply chain, Protocol 534 helps suppliers demonstrate compliance readiness while helping manufacturers reduce duplication, improve efficiency, and support a more predictable path toward final product conformity assessment.
Ready to get started?
Whether you're a supplier of formulations or non-final materials, or a manufacturer of final drinking water products, Protocol 534 can help simplify compliance across the drinking water supply chain.
Talk to an NSF expert about evaluating your formulations, compounds, additives, coatings, pre-products, intermediate products, constituent products, or site-applied materials under Protocol 534. Use the contact us form below.
Learn more about NSF Protocol 534
Evaluation of Formulations, Pre-products, Intermediate Products, Constituent Products, and Site-applied Products in Connection with the European Drinking Water Directive.
How NSF Can Help You
What’s New with NSF
NSF Launches Protocol 549 for Glyphosate Reduction Claims
October 14, 2026P549 is the first standard globally that validates glyphosate reduction performance of water filtration systems and products.
NSF Welcomes Hanjun Kwon, Managing Director, APAC
September 14, 2026Experienced business leader to drive sustainable growth, organisational development and operational excellence across the Asia-Pacific region.
NSF Welcomes Nicole Parent Haughey to Board of Directors
September 10, 2026NSF's appointment of Nicole supports the organisation's continued focus on long-term growth and transformation.
NSF Launches Independent Certification Standard for Compact Products
August 25, 2026New third-party certification verifies products cutting materials and shipping impacts while maintaining safety and performance.