You are right glb, however, the landlords down here, do not care, the building may end up with no water as the line may be shut. till the landlord fixes the problem. Also there are chances the good samaritan may be told to leave and also the deposit will be confiscated.
Another solution, all tenants contribute and repair the tank and fix the pump mechanism which could be cheaper.
Simple. Just write a complain letter in Arabic to the Municipality giving all the details such as the name of your compound, location etc. and send it to them through email or fax. They will take the matters in their hands and have the landlord fix the problem. The Municipality may even penalize the landlord.