This case study presents an investigation into microbial risk assessment services provided by SGS Australia concerning frac water reuse. The study focuses on the operational threats posed by microbial contaminants in frac water, particularly highlighting microbiologically influenced corrosion (MIC) as a significant concern for industries relying on metal infrastructure. The document outlines the challenges faced due to microbial presence, including structural integrity compromise and increased operational costs. It details a specific case involving an operator in the Northern Territories of Australia, where severe corrosion was noted in a choke manifold assembly. The SGS MIRAS team conducted a root cause analysis, utilizing advanced microbial techniques to assess contamination and corrosion risks. The findings revealed high levels of total prokaryotes and specific microbial species associated with MIC. Recommendations for remediation and future mitigation strategies are provided, emphasizing the importance of stringent water treatment processes and continuous monitoring to ensure the safety and sustainability of reused water.