 However, a recent study shows that for domestic water use slum dwellers in Dhaka Metropolitan Area are paying about 7 to 14 times higher than the legal connection holders covered by DWASA.Slum dwellers are spending about 12 to 15% of their average monthly income for domestic water supply, whereas in most of the countries, legal connection holders are spending less than 5% of their average monthly income for the same purpose.A common indicator of whether water utilities are overstaffed is the ratio of employees per 1,000 connections.