Local Government Drinking WATER Company TIRTA MON Pase can not fulfill the needs of the people in the Lhokseumawe city because the population of Lhokseumawe city continues to increase every year. Therefore, it has increased the need for the clean water. The artificial intelligence can be used to forecast the continuous distribution of water demand. This study aims to predict the volume of water to m the water demand using Least Square method. The modeling results using the least squares method, in 2018, with the population of 218 067 people, the water supply needed is 5,689,849,205 liters/day, and the possibility of water leakage is 107573120 liters/day. This system can minimize the possibility of the errors due to the amount of water leakage.