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The need for water, especially clean water, is currently increasing rapidly in line with the increase in population and the need for people to meet their needs such as drinking, cooking, washing, bathing, toilets and other activities. The high population growth has resulted in not all components of society being able to enjoy clean water. As a result, many of them use groundwater and river water where the quality of the water sources cannot be ascertained. This also applies to residents in the Deket District, Lamongan Regency. Therefore, community service activities are carried out by making water filtration technology sourced from the Deket River using the Slow Sand Filter method using up flow. The results of the filtration process analysis showed that the turbidity value decreased by 83.70%, hardness by 91.27%, pH reached 7.7, manganese by 82.47% and iron by 59.38%.

BUMDES Lantongau is one of the Lantongau Village-Owned Enterprises whose one line of business is to distribute clean water needs in four villages, namely Lantongau Village, Morikana Village, Katukobari Village, and Lakorua Village. In order to facilitate the registration process, meter recording, payment bills, service interruption information, and customer complaints, applications that facilitate all service processes. Therefore, the most suitable application is using an Android-based application, the use of an Android-based application is an option because almost all customers have an Android device, so that services can be directly carried out quickly, easily, effectively and efficiently. With this application, it is easier for the customer and the BUMDES Lantongau in services ranging from customer registration, meter recording, billing payments, customer complaints and information on service disruptions, all can be done through the application. This application is designed using android studio with Research and Development (R&D) development method   Keywords: Android Application, Customer Service, BUMDES Lantongau

Sentiment analysis of comments from visitors to tourist attractions and the public on tourist attractions in Sukabumi Regency which is one of the areas with various categories of tourist objects and is a sector of economic income for the surrounding community or for related parties such as the government and managers, in sentiment analysis research This includes using the Nave Bayes classification algorithm to examine the sentiment of tourist visitors and the performance of the classification model used. The data used in this research was taken from the website from Tripadvisor and Google Maps using a crawling technique, which then processed the data by a pre-processing process and then applied a classification to the data and got a sentiment visualization by processing word frequency on tourist visitor sentiment data. The results of the accuracy of the model used were re-tested with the k-fold cross validation method and the results of sentiment visualization got the frequency of words that most often appear on negative sentiment labels are garbage, beaches, lacking, places, roads, parking, dirty, entering, caring, clean , expensive, pay, manage, good and water.

Pamaris Village is located in the highlands of Gunungtua Village, Cijambe District, Subang Regency. The existence of this area which is located in the highlands makes it difficult for the community to get clean water for their daily needs. Has a river flow that is used for agricultural and fishery water but is not utilized for clean water needs because the community doubts the quality of river water to be used as a source of clean water. With the background of the problems in Pamaris village, the lecturers and students of the Civil Engineering study program, Faculty of Engineering, University of Subang took the initiative to do community service by making a simple water treatment tool to treat river water so that it can be used to meet the community's clean water needs. The planned water treatment system consists of a coagulation tank, a sedimentation tank, a slow sand filter and a fast sand filter. The filter material consists of coral, palm fiber, zeolite, split stone, palm fiber, activated carbon and sand. The results of testing the treated water showed that all parameters of Physics, Inorganic Chemistry and Organic Chemistry were still within the limits of clean water quality standards. The results of bacteriological examination did not find bacteria. Thus, in general, water quality can be used as a source of clean water for the community.

The lack of public awareness in implementing Health protocols in the prevention and handling of Covid-19 is the reason for providing education or knowledge of citizens on the importance of maintaining health protocols. The objectives of this community service program are 1) to increase public knowledge and provide correct information on how to prevent and handle Covid-19, 2) to help realize government programs so that they can run the Clean and Healthy Lifestyle (PHBS) and Healthy Living Community Movement (PHBS) program. GERMAS) which is programmed by the government such as washing hands in running water, using hand sanitizer, using mouth masks, maintaining distance, 3) assisting the government in disseminating correct information about how to prevent and handle COVID-19 through mass media, both print media such as brochures. / leaflets and electronically through social media, 4) increase the sense of security and comfort for the community to carry out activities outside the home such as worshiping in public places and other activities, because disinfectants have been sprayed regularly in certain places, 5) assisting the government in implement a vaccination program mass by providing correct information and knowledge about the vaccination program as a preventive effort to prevent and handle covid-19 and 6) the realization of people who are aware of the importance of maintaining health. The method of activities carried out is using the Participatory Rural Appraisal (PRA) approach, Observation, Focus group discussion (FGD) approach, counseling, mentoring/monitoring, providing follow-up and program evaluation. The results of this activity showed a very positive response from the residents of the Linggasirna Community, Sariwangi District, Tasikmalaya Regency with this activity, we even received a report from the village head that more than 60% of residents who had vaccinated so far had only 15% of the total population. inhabitant. The outputs of this activity are: 1) publication in local print mass media, and 2) producing scientific publication articles published in accredited National Journals with ISSN.

The availability of clean water in the Oebola village community has not yet been available due to several obstacles, such as the distance of the water source from the residential area has not yet received the service of a clean water distribution system network that makes it easier for the community to obtain clean water to meet their daily needs. This study aims to determine the pattern of clean water consumption, the potential of water sources, the rate of clean water usage in 2020-2030, and strategies to meet the needs of clean water. The research method used in this research is descriptive method. The results of the analysis show that the current use of clean water is 43 liters/person/day less than the standard 60 liters/person/day, there is an adjustment to the limited water use in daily use such as bathing and washing habits. The potential available water sources from the Oetulu spring with a minimum discharge of 1.27 liters/second is smaller than the demand in 2020, which is 2.89 liters/second and in 2030 it is 4.39 liters/second. The strategy to fulfill clean water needs in Oebola Luar village is to provide clean water distribution system network services that make it easier for the community to obtain clean water.

Basic sanitation is a community effort that focuses on controlling the physical structure, where people use it as a shelter that affects the degree of human health. The purpose of this study was to determine the description of basic sanitation facilities in Kairatu Village, Pakarena Coastal Area in 2021 which includes facilities for providing clean water, toilet and bathroom facilities, waste water management facilities and waste disposal facilities. This type of research is descriptive research, namely the research method carried out with the aim of making a description or descriptive of an objective situation. which was carried out in Kairatu Village, Pakarena Coastal Area in 2021. Provision of clean water facilities in Pakarena hamlet, there are 11 existing families, own property, odorless, colorless, tasteless while there are 4 existing families, but not their own, odorless, colorless and tasteless. On average, Pakarena hamlet residents have a latrine, the type of latrine used is goose neck and has a saptic tank of 14 families and 1 family who does not use a goose neck latrine. Waste water management facilities have not met the requirements. A total of 14 families of waste water are channeled into open sewers and 1 family has SPAL that does not pollute the water. Garbage disposal facilities do not meet the requirements, garbage boxes are not available at all and residents only throw garbage in rivers near settlements while some residents manage waste by burning so that it can pollute the environment.

Human needs for vital living air, ranging from ablution, bathing, washing, latrine, cooking, washing, and so on. The limitation of clean water from PDAM is a necessity, because to meet the air needs of every resident who needs abundant raw water and adequate infrastructure. UNTAG Semarang campus which is located on Jl. Pawiyatan Luhur, Bendan Duwur Village, Gajahmungkur District, Semarang City has 7 main buildings. All of these buildings have daily water needs for toilets, ablution and watering plants around the buildings. The highest potential for rainwater harvesting at the UNTAG Semarang Campus is in February with the following potential catches: Faculty Building 233 m3, Fisip & FTP Building 211 m3, Faculty & Rectorate Building 321 m3, FEB & YPP 17 Building 229 m3, Rusunawa Building is 48 m3, Campus Mosque is 26 m3 and PMB Building & Library is 48 m3.