The paper presents a comprehensive approach to developing an automated water quality management system for smart aquaponics, aiming to enhance sustainable urban agriculture. The study combines a literature review and controlled experiments to address the challenges of maintaining optimal water quality and minimizing environmental control errors in aquaponic systems. The authors propose a PID control system integrated with a microcontroller (PIC18F4550) to manage sensors and actuators, ensuring stable and responsive control over various variables such as pH, temperature, water level, total dissolved solids (TDS), and turbidity. The system is designed to optimize resource utilization and improve the stability of aquaponic systems. The PID controller was tuned using both the PID Tuner App and manual techniques, resulting in optimal values for the vegetable tank, fish tank, and heater system. The system's performance was validated through simulations and real-world testing, demonstrating its ability to maintain optimal conditions for both fish and plants. The study highlights the importance of effective water management and advanced technologies in achieving sustainable urban agriculture.The paper presents a comprehensive approach to developing an automated water quality management system for smart aquaponics, aiming to enhance sustainable urban agriculture. The study combines a literature review and controlled experiments to address the challenges of maintaining optimal water quality and minimizing environmental control errors in aquaponic systems. The authors propose a PID control system integrated with a microcontroller (PIC18F4550) to manage sensors and actuators, ensuring stable and responsive control over various variables such as pH, temperature, water level, total dissolved solids (TDS), and turbidity. The system is designed to optimize resource utilization and improve the stability of aquaponic systems. The PID controller was tuned using both the PID Tuner App and manual techniques, resulting in optimal values for the vegetable tank, fish tank, and heater system. The system's performance was validated through simulations and real-world testing, demonstrating its ability to maintain optimal conditions for both fish and plants. The study highlights the importance of effective water management and advanced technologies in achieving sustainable urban agriculture.