This handbook provides a detailed and practice-oriented examination of instrumentation in water and wastewater treatment systems, emphasising its role in ensuring operational efficiency, quality control, and regulatory compliance. It presents a clear understanding of how monitoring devices and control systems are integrated within treatment processes to maintain water quality and system reliability. The handbook connects fundamental principles of measurement and control with real-world applications, highlighting how accurate data acquisition supports effective decision-making in plant operations. It further explores the relationship between resource management, treatment strategies, and environmental standards, encouraging a systematic approach to process optimisation. Attention is given to the challenges of managing water resources and treatment facilities in changing environmental and policy contexts. The discussion reflects current industry practices, promoting a balanced perspective on technology, sustainability, and public health considerations.

This handbook is intended for engineers, plant operators, researchers, and advanced learners seeking to enhance their understanding of water treatment systems. It supports the development of technical competence, analytical skills, and practical insight required for efficient monitoring and management of water and wastewater treatment operations.