The global challenge of declining water availability, combined with increasing demand, has led many countries, including Morocco, to face water shortages. To tackle this issue, a key strategy is to reduce water losses in distribution systems to a sustainable level. This article examines this important issue, focusing on two Moroccan cities, Al-Hoceima and Marrakesh. Our main goal is to evaluate the economic level of non-revenue water. To do this, we use the cumulative cost–benefit method, which helps us determine the economic level of non-revenue water in both cities. In 2021, we found that in Al-Hoceima, the level of non-revenue water was below the economic level, suggesting that Al-Hoceima’s strategy may not be economically viable. However, in Marrakesh, the level of non-revenue water slightly exceeded the economic level, indicating a need for reassessment and possibly increased investment in controlling non-revenue water.