The water quality of the Kahayan River is still below the criteria for clean water quality standards. One of the treatments to improve water quality is snail shells as adsorbents of heavy metals Fe and Zn are categorized as pests on fruit plants. The object of this research is the snail shell activated charcoal is used to improve the quality of river water on heavy metals Fe and Zn. The mass variation of snail shell activated charcoal weighing 0 grams, 5 grams, 10 grams, and 15 grams. The research process is divided into the Preparation Stage and Implementation Stage, where the implementation stage consists of making snail shell charcoal, making HCl solution, activating snail shell charcoal, and absorbing snail shell activated charcoal. Snail shell activated charcoal plays an active role in decreasing Fe and Zn concentrations. At 5 mg of snail shell activated charcoal was able to reduce 53% Fe concentration and 69% Zn concentration. Snail shell activated charcoal with a mass of 10 mg and 15 mg was able to reduce Fe concentration by 82% and 84%. Testing the Zn concentration in the mass of 10 mg and 15 mg was not read optically, due to the limited accuracy of laboratory equipment.

Reforestation is an effort to plant trees or plants in places considered to be able to grow and develop these plants. Greening/reforestation is done to restore a beautiful and healthy environment without pollution. The atmosphere around the housing complex for the lecturers of Campus II University of Muhammadiyah Palangka Raya, there is still some vacant land, the trees are scarce, and each resident's house also has a few plants on its terraces. The results of the survey that we received were that the people's level of awareness about the importance of plants was shallow. This is the basis for this community service activity, by carrying out reforestation to build awareness of the importance of reforestation by planting trees to reduce the risk of flooding. This community service was carried out by 26 high school / vocational / MA students throughout Palangkaraya City and 18 students of Environmental Engineering, University of Muhammadiyah Palangka Raya, as many as 2020 and 2021 students by providing plant seeds and planting them directly on each side of the road in front of residents' houses. Plant seeds used are fruits and others. The result of the implementation of this activity is that the residents feel helped and happy; they also happily accept this activity; the residents think that it is easier for us students and students who directly plant their plants in their complex to try to reduce the risk of flooding or erosion.

Air adalah senyawa yang penting bagi semua makhluk yang ada di bumi, air memiliki fungsi sebagai penyembuh penyakit bisa dikatakan air merupakan senyawa netral yang keberadaannya sangat diperhatikan oleh semua jenis makhluk hidup dimuka bumi ini. air beserta sumber-sumbernya merupakan salah satu kekayaan alam yang mutlak dibutuhkan oleh makhluk hidup guna menopang kelangsungan hidup dan memelihara kesehatannya. berbeda halnya dengan air gambut adalah air permukaan yang banyak dujympai di daerah lahan gambut atau dataran rendah terutama dipulau kalimantan khususnya palangka raya, air gambut mengandung senyawa zat organik ter;larut yang menyebabkan air menjadi berwarna coklat dan bersifat asam dengan Ph 3-5, sehingga perlu pengolahan khusus sebelum digunakan dan dikonsumsi. proses pembentukan gambut dimulai dari adanya danau dangkal yang secara perlahan ditumbuhi oleh tanaman air dan vegetasi lahan basah. air gambut di kelurahan bangkirai, kecamatan sabangau yang sudah diuji kualitas air nya berdasarkan parameter baku mutu air tidak memenuhi persyaratan kualitas air bersih.

Palangka Raya City is one of the cities affected by COVID-19, where on November 11, 2021, and 13104 people were confirmed positive for COVID-19. The Health Protocol continues to be carried out in this New Normal era. The Health Protocol by washing hands with soap is an environmental issue that needs attention, namely the use of hand soap which reduces surface air quality. Hand soap contains chemicals that can increase the concentration of Chemical Oxygen Demand (COD). There is a need for laboratory testing of the COD parameters of surface water around handwashing facilities in public facilities in the era of new habits. The research was divided into laboratory tests on surface water parameters, namely pH, temperature, and COD as well as field surveys on the use of handwashing facility. The results of laboratory tests show that the quality of surface water on the COD parameter is below the quality standard. The use of handwashing facilities is not justified, because its use is only 19%. Along with the low use of handwashing facilities, hand washing facilities do not have an impact on decreasing surface water quality on the COD parameter, it can be an action to maintain surface water quality.

Scavengers have a risk of contracting Covid-19, which comes from the garbage when it is sorted. Based on this, it is necessary to make efforts to build a handwashing installation in the Km. 14 Landfill Palangka Raya City environment to prevent Covid-19, for the convenience of scavengers at work without the need for worries. The handwashing installation placement is based on the points that scavengers frequently pass so that it will be easier to access. This easy access will increase handwashing installations, which will potentially reduce the risk of Covid-19 spreads in the Km. 14 Landfill Palangka Raya City. The 250 L reservoir is placed on a wooden support. The placement is intended to facilitate the installation of water taps and when washing hands. The installation of water faucets is carried out in the 250 L reservoir provided by the 250 L reservoir producer. The sink is placed just below the water faucet outside, making it easier to wash hands and regulate water flow. The water flow from the collected hand washing will then flow gravitationally to the water filter that has been attached to the hose for further filtering so that when it flows into the country, the results of handwashing will not reduce the quality of the soil or groundwater.