International Research Journal of Engineering, IT & Scientific Research Available online at https://sloap.org/journals/index.php/irjeis/ Vol. 9 No. 2, March 2023, pages: 65-75 ISSN: 2454-2261 https://doi.org/10.21744/irjeis.v9n2.2289 65 The Study of Clean Water Supply System Managed by the Community to Ensure Reliability of the Clean Water Supply System in Tabanan District Ketut Wiwin Andayani a I Nyoman Anom Purwa Winaya b I Nyoman Sedana Triadi c I G N K Mahesa Adi Wardana d Article history: Abstract Submitted: 09 December 2022 Revised: 18 January 2023 Accepted: 27 February 2023 Based on data from the Tabanan Regency Central Bureau of Statistics in 2020 administratively the Tabanan Regency area is 839.33 km2, consisting of 133 villages and 816 official banjars, with a population of 448,000 people. Tabanan Regency is one of the regencies in Bali, where the topographical conditions of the existing villages are mostly in remote areas, so they often experience difficulties with clean water distribution problems. For the current condition, the provision of clean water in Tabanan Regency is provided by PDAM (Local Water Company) through the use of springs, ground water and river water, in addition to several areas the water supply is carried out through Pamsimas (Community-Based Drinking Water and Sanitation Provision). Currently Pamsimas Tabanan Regency is divided into 9 service coverage areas for people in rural areas. In general, the condition of drinking water services presents the main problem, namely that not all areas are accessed by adequate water services. This problem is mainly caused by various obstacles such as limited water resources, limited infrastructure and topographical conditions. The research implementation is broadly carried out in the form of information collection (secondary and primary data collection), field surveys, problem analysis, and formulation of the preparation of non- PDAM clean water supply systems for current and future conditions. The research output for the final report is the amount of non-PDAM (Pamsimas) water availability in Tabanan Regency for current conditions by utilizing the potential of water sources from existing springs, which is 73.16 Lt/sec. Meanwhile, the amount of Non-PDAM (Pamsimas) water demand in Tabanan Regency for the current condition is 224.00 Lt/sec, while the projected Non-PDAM water needs in Tabanan Regency until 2040 are as follows, non-PDAM water needs in 2025 are 230.846 Lt/sec, in 2030 it is 237,993 Lt/s, in 2035 it is 245,457 Lt/s and in 2040 it is 253,256 Lt/s. The service level of the non-PDAM clean water supply system (Pamsimas) in Tabanan Regency for the current condition has only reached 21.41%, while the reliability level of the Non-PDAM clean water supply for the current condition has only reached 32.66%. Meanwhile, the service level of the non- Keywords: clean water; non PDAM; water availability; water needs; water supply system; a Civil Engineering Departement Politeknik Negeri Bali, Badung, Indonesia b Civil Engineering Departement Politeknik Negeri Bali, Badung, Indonesia c Civil Engineering Departement Politeknik Negeri Bali, Badung, Indonesia d Civil Engineering Departement Politeknik Negeri Bali, Badung, Indonesia