Assurance Model

Alliance for Water Stewardship / Assurance Model

Water Stewardship Assurance Services

Water Stewardship Assurance Services (WSAS) is the mission-driven assurance provider for the AWS Standard System.

WSAS shares the AWS vision of a water-secure world and contributes to our mission by providing credible assurance against the International Water Stewardship Standard (AWS) Standard. WSAS provides initial certification, surveillance, and re-certification services in line with requirements set by the AWS Technical Committee. 

As the custodian of the AWS Standard, AWS oversees WSAS performance to maintain the quality, integrity and credibility of the assurance scheme.

Ensuring credibility

AWS is ISEAL Code Compliant. Our system has been independently evaluated against ISEAL’s Codes of Good Practice––a globally-recognised framework for effective, credible sustainability systems. More information at

 In addition, WSAS is working to achieve accreditation to ISO 17065, the globally recognised standard for certification bodies, at the earliest possible date. 

Frequently Asked Questions (FAQs)

For more information, please read our short FAQs section below.


How do I certify my site with WSAS?

Sites seeking certification should engage directly with WSAS to contract certification services. For more information on the steps to certification, costs and more, visit the WSAS website. 

What will the cost of certification be?

As a mission-driven organisation, WSAS has a key role to play in ensuring AWS certification is accessible. WSAS aims to ensure its pricing structure enables certification to be available to the widest spectrum of users. 

To learn more about certification costs, please visit the WSAS website.

How is WSAS governed?

As a mission-driven subsidiary of AWS, the scope of WSAS’s work is determined by a mandate provided by the AWS Board. This mandate includes:

  • Compliance with AWS System Requirements as defined by the AWS Technical Committee
  • Contributions to AWS’s mission to ignite leadership in credible water stewardship

WSAS is a limited liability company whose work is overseen by a majority independent Board of Directors. One AWS Trustee and the AWS Group CEO also serve on the WSAS Board of Directors.

The Certification Advisory Committee (CAC) is an independent body established to ensure the impartiality of WSAS processes and serve as an Appeals Panel in relation to certification decisions. Neither the AWS Board nor the WSAS Board are involved in certification decisions taken by WSAS.

If I have another question, who should I contact?

If you have any further questions, contact us by filling out the form below, or visit the WSAS website at 


For more information and guidance, please visit the website for Water Stewardship Assurances (WSAS) using the button below.