Survey on heavy metal pollution in drinking water was conducted in Jakarta from August to October 1986. The purpose of this study was to measure the concentration of heavy metals in drinking water served by the Water Supply Enterprise and private dug wells. Ninety water samples from Water Suply Enterprise and 140 samples from Community dug wells were analysed. The mercury concentration was analysed using the Cold Vapour Technique, while other metals (Cd, Cu, Pb, Zn) were analysed using the Air Acetylene Method by Atomic Absorption Spectrophotometer (AAS). The concentration of mercury of 30% samples from Water Suply Enterprise and 44% samples from Dug Wells varied from 0.0002- 0.0024 ppm and 0.0002-0.021 ppm respectively. Pb and Cd were undetectable. The concentration of Cu of 21% samples from Water Supply Enterprise and 1 3% samples from Dug Wells were 0.12 ppm and 0.06 ppm. The concentration of Zn of 81% samples from Water Supply Enterprise and 56% from Dug Wells varied from 0.01 -4.97 ppm and 0-01- 5.59 ppm respectively.