In the F&B industry, challenges in hygiene, cleaning efficiency, and operational consistency are unavoidable, yet their impact often remains hidden until serious consequences arise: operational deviations, reputational risks, plant shutdowns, or, in extreme cases, critical incidents affecting consumers. While equipment in direct contact with food usually receives continuous attention, peripheral areas and drainage systems harbor less visible risks that, if left unaddressed, can escalate into complex and costly problems. To tackle these risks, we developed a systematic Drainage System Assessment (DSA) methodology, applied across more than 60 plants worldwide, analyzing over 1.600 critical points under real operational conditions. Each observation was carefully recorded, compared, and validated, enabling identification of consistent and recurring patterns, regardless of plant size, age, segment, or process type. This evidence-based approach goes beyond subjective perception, providing an objective and reproducible understanding of where and how hidden risks emerge, impacting operational reliability, performance, and food safety. The analysis identified five key categories of concern: 1. Design deficiencies 2. Structural Damage or Deterioration 3. Cleaning & Hygiene Issues 4. Installation or Construction Defects 5. Operational or Maintenance Issues Recognizing these data-driven patterns allows companies to anticipate vulnerabilities, guide design and operational decisions, and strengthen plant resilience and reliability. The presentation will demonstrate how this methodology can be integrated into hygienic design strategies and continuous improvement programs, transforming quantified observations into actionable operational decisions, mitigating hidden risks, optimizing performance, saving costs, and safeguarding both company reputation and consumer safety.