Different diseases are caused due to the consumption of contaminated water. It is of utmost importance that monitors the quality of water used for domestic purpose. This paper presents an IoT based warning system that regularly monitors the quality based on the parameters like pH, turbidity, and conductivity. A tank was devised to integrate the sensors and connected to the main source of water supply for buildings. The real time measurements of these parameters could be viewed on a mobile application along with a user-friendly warning indications. Testing was done with water samples that have been procured from various sources and the accuracy of the system was validated with lab tests. The main advantage of this system is that it incorporates low cost platforms and cloud storage that remains portable, easy for maintenance, good accuracy, and incorporated near to consumer.. © 2020 IEEE.