Article’s

Access to clean and safe drinking water is a fundamental necessity, yet contamination from industrial waste, agricultural runoff, and inadequate treatment facilities poses significant health risks globally. Traditional water quality monitoring methods are often manual, time-consuming, and lack real-time alerting capabilities. To address these challenges, this paper proposes an IoT-based automated water quality monitoring system that integrates turbidity sensing for contamination detection and ultrasonic sensing for continuous water level measurement. The system employs an Arduino Nano microcontroller to process turbidity data measured in Nephelometric Turbidity Units (NTU) and displays water quality status along with tank level information on a 16×2 LCD screen. An audible alarm activates when contamination exceeds safe thresholds, providing immediate alerts. By replacing conventional IR sensors with ultrasonic distance measurement, the system achieves non-contact, accurate, and maintenance-free level detection suitable for various tank configurations. This cost-effective, scalable, and user-friendly solution is ideal for residential water tanks, community water supplies, and small-scale purification plants. Keywords: Water Quality Monitoring, Turbidity Sensor, Ultrasonic Sensor, Arduino Nano, IoT, NTU Measurement, Contamination Detection, LCD Display.