This document is a guide detailing Xylem’s Cybersecurity Assessment services, which focus on ensuring the security of Operational Technology (OT) systems. It outlines the increasing threat of cybercrime, projected to cost $10.5 trillion by 2025, and emphasizes the vulnerabilities present in water and wastewater systems. The guide presents a four-pronged approach to cybersecurity assessments, which includes Architecture Review, Vulnerability Review, Maturity Assessment, and Health Check. Each component is designed to evaluate and enhance the security posture of OT systems. The Architecture Review confirms the presence of adequate defenses, while the Vulnerability Review prioritizes risks from identified vulnerabilities. The Maturity Assessment provides recommendations for aligning capabilities with industry standards, and the Health Check ensures that solutions remain securely deployed. The document stresses the importance of proactive cybersecurity measures and offers actionable recommendations for secure digital transformation in the water sector.