There are several reasons: You do not always find water. And even if you do, sometimes it is not potable. Often, you need to drill deep in the ground, approximately 500m to find water. Bringing water to the top requires treadle pumps and electrical equipment, which are both expensive and difficult to maintain. Various international organizations have invested funds to build wells in these communities. However, maintaining them has been a challenge, as local governments cannot always keep them in function or successfully repair damages.