Abstract: This project revolves around an Arduino- based automatic water level controller and indicator, employing ultrasonic sensors for water level measurement. These sensors operate on the "echo" principle, wherein transmitted sound waves return after striking an obstacle. Utilizing this principle enables the calculation of travel time for both outgoing and returning waves, facilitating the determination of distance. This fundamental concept is integrated into the project design. The system activates the motor pump automatically when the water level is low, addressing the pressing issue of drinking water scarcity prevalent in India and other countries. The project aims to contribute to water conservation efforts, given the prevalent crisis. Many households in India use overhead tanks, resulting in water overflow and substantial wastage of both water and electricity. To combat this, the project introduces an automatic water level controller, eliminating the need for manual switching ON and OFF of the motor pump. The device continuously monitors the water level and triggers a relay, subsequently activating the motor pump. This automated process not only minimizes water and electricity wastage but also reduces the reliance on manual operation, thereby optimizing efficiency.