Selected heavy metals in drinking water supply and its health effects

The study is a cross-sectional study of the drinking water supply in the residential area of Old Town, Petaling Jaya. Samples of water from 41 houses were taken by simple random sampling. Measurement of cognitive performance was done through the administering of the Wechsler Intelligence Scale for Children IV (WISC IV) test to a sample size of 51 people, on the population of children (8 to 14 years old) living in thestudy area who consumes the unfiltered drinking water supply from their homes. Measurement of gastrointestinal health effects was done through the administration of questionnaires to a sample size of 51 people, and sampling was carried out on the population of people living in the residential area who consumes the unfiltered drinking water supply from their homes.