Impack of Domestik Activities and Tourism on the Ayung River Basin, Gianyar, Bali

Watersheds are very important resources for human life. The Ayung River located in the Ubud area plays an important role for tourism, agriculture and raw water sources for upstream areas and greatly supports the economy. Water is a natural resource that is needed for the livelihoods of many people, even by all living things. Therefore, water resources must be protected so that they can continue to be utilized properly by humans and other living things. Water pollution is indicated by a decrease in water quality to a certain level that causes the water to not function according to its intended use. The Ayung River as a source of community economy must be controlled from domestic pollution sources. This study aims to analyze the pollution index of the Ayung River and determine the dominant parameters that affect the pollution index. The research method uses a quantitative approach using primary data sources taken directly in the field and secondary data sources using data from the government and previous studies. The results of the study showed that the pollution index for class I water allocation for all water samples taken was in a lightly polluted condition. While the allocation of class II, III, and IV water for all water samples taken was in a condition that met the quality standards. The condition of the water pollution index is influenced by the high parameter e. coli that is on the threshold of the water quality standard for class I, II, III, and IV. While the coliform parameter is on the threshold of the water quality standard for class I and class II.