Corrosion monitoring in wastewater applications is essential for maintaining the longevity and reliability of infrastructure such as pipelines, treatment plants, and storage tanks. The aggressive nature of wastewater, with its hydrogen sulphide, fluctuating pH levels, and other corrosive chemicals, poses significant risks to metals and concrete. Utilizing non-intrusive ultrasonic testing (UT) thickness devices provides highly accurate, real-time data, enabling continuous assessment of corrosion rates and rapid identification of areas of concern. This approach allows for proactive maintenance scheduling, preventing costly failures and extending equipment lifespan. Additionally, it ensures compliance with environmental regulations and supports the safe operation of wastewater facilities. Integrating corrosion monitoring with predictive maintenance strategies optimizes resource use, reduces downtime, and enhances the overall efficiency and sustainability of wastewater management systems.