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The increasing demand for clean water at the Faculty of Engineering, Sultan Agung Islamic University (UNISSULA) Semarang requires an alternative and sustainable water source. One effective solution is the implementation of a rainwater harvesting (RWH) system to meet non-domestic water needs such as toilet flushing, plant irrigation, and campus cleaning. This study aims to analyze the potential utilization of rainwater, design an appropriate RWH system, and evaluate its cost efficiency compared to the use of PDAM (regional water supply company) water. This research employed a quantitative approach by collecting primary data, including roof catchment area measurements and existing rainwater drainage conditions, as well as secondary data such as average rainfall, the number of campus users, and PDAM water tariffs. The analysis consisted of calculating the potential harvested rainwater volume, designing the RWH system, estimating installation costs, and comparing operational costs between RWH and PDAM water usage. The results indicate that the potential harvested rainwater volume from the building’s roof is approximately 7,054.5 liters/day, while the average non-domestic water demand is 3,170 liters/day, allowing water needs to be met during the rainy season. The implementation of the RWH system can also reduce water costs by up to 43,6%, equivalent to IDR 87.615.616 over a 20-year period. Therefore, the application of RWH is an effective and sustainable solution for water management within the campus while supporting operational cost efficiency.

This study aims to find out and test the influence of PDAM service quality, PDAM tariff and PDAM payment place on PDAM payment receipts. This research was conducted with a quantitative approach. The type of data in the form is primary data with questionnaires. The study population is PDAM customers in Brebes Regency.  The determination of the number of samples in this study with the Slovin formula obtained 98 responses. The respondents' answer data was tested with validity and reliability tests. It is then tested with a classical assumption test. The data analysis technique was carried out by multiple regression test The results of the study showed that the quality of PDAM services partially affected the receipt of PDAM payments obtained a sig value = 0.000 < 0.05. Partially, the PDAM tariff affects the receipt of PDAM payments, obtaining a sig value = 0.000 < 0.05. Partially, the place where PDAM payments affect the receipt of PDAM payments obtained a sig value = 0.001 < 0.05. Simultaneously, the quality of PDAM services, PDAM tariffs and PDAM payment places affect PDAM payment receipts.