Previous studies state that improper landfill or waste management is one of the main causes of nitrite, nitrate, and heavy metal contamination in groundwater. In Bekasi, Indonesia, 70% of the population depends on groundwater for daily use, including the residents of Sumur Batu. The village of Sumur Batu is located adjacent to two landfills, namely, the Bantar Gebang landfill, which is the largest landfill in Indonesia, and the Sumur Batu landfill. This research analyzed the health risk of drinking groundwater that may have been contaminated by nitrite, nitrate, and heavy metals. Data processing was performed separately for different age groups: infants, children, and adults. The results showed that there is a risk of NO2 exposure in all age groups when groundwater is used as a source of drinking water in Sumur Batu. Because the region is directly bordered by a landfill area and the community is highly dependent on groundwater, as long as access to water services is not guaranteed, the quality of groundwater in this area needs to be monitored.
Kepulauan Seribu is an area off the north coast of Jakarta consisting a relatively large number of small islands. Development of the electricity system here is planned to interconnect among islands. These developments tend to consider more on the supply and not much on the demand of each household. The difference in functions of each island is expected that in the future, planning to increase electricity transmission can be more focused on the pattern of needs as reflected in the consumption patterns and household characteristics. Therefore, this study was aimed to determine the pattern of household electricity consumption based on differences in the island function, and to find out the relationship between household characteristics and that patterns. The characteristics include household income, house building area, number of household members, and building functions. The variables in this study were analyzed using the descriptive spatial analysis and chi-square test. The results of the study showed that the electricity consumption pattern on the island which function in the tourism category was higher than the one in the non-tourism category. The results of statistical tests showed that both of an island tourism categories and non-tourism category the function of the household building has a relationship with electricity consumption.
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