Water Stewardship Assurance Services (WSAS) is the mission-driven assurance provider for the Alliance for Water Stewardship (AWS) System. We contribute to the AWS mission by providing robust assurance against the AWS Standard. After the initial certification, we assess sites’ continual improvement through our surveillance and re-certification processes. As the custodian of the International Water Stewardship Standard, AWS oversees WSAS performance to maintain the quality, integrity and credibility of the certification scheme.