Status Report 2016-2019 Environmental Science and Remote Sensing Applications in Hydrological Studies R KUMAR 1,* , P R PUJARI 1 , P CHAUHAN 2 , S P AGARWAL 2 , S K JAIN 3 , S JAIN 3 , L ELANGO 4 , P R MUDULI 5 , C PADMAKAR 1 , L DESHPANDE 1 , A KAPLEY 1 , R VIJAY 1 , S DHYANI 1 and P VERMA 1 1 CSIR-National Environmental Engineering Research Institute, Nehru Marg, Nagpur, India 2 Indian Institute of Remote Sensing, Dehradun, India 3 National Institute of Hydrology, Roorkee, India 4 Department of Geology, Anna University, Chennai, India 5 Chilika Lake Development Authority, Chilika, India (Received on 28 August 2019; Accepted on 04 September 2019) The present review deals with some of the works of Environmental Science and Remote sensing in the Hydrological applications. The results are categorised Institute wise with the Principal workers being identified. Keywords: Geogenic Contaminants; Water Quality; In-situ Treatment; Satellite Data *Author for Correspondence: E-mail: r_kumar@neeri.res.in Proc Indian Natn Sci Acad 86 No. 1 March 2020 pp. 495-501  Printed in India. DOI: 10.16943/ptinsa/2020/49803 Introduction The water bodies globally are often under stress from geogenic and anthropogenic stresses. The increasing population accompanied by the increasing urbanization has put lot of stress on the quality of water bodies. As the water bodies provide very important eco system services, it is necessary that they are to be protected. There are various quality issues with the water quality, which require solutions which are site specific and people centric. The issues range from geogenic contaminants, namely arsenic and fluoride in groundwater to the poor quality of surface water bodies like streams and lakes in terms of very high BOD and COD in the urban settings. Restoration of the water quality is being attempted by both in-situ and ex-situ approach. The use of Remote Sensing in delineating Environmental Management Plan of water bodies has emerged as a very popular tool. The efforts are made by different Institutes in India to provide sustainable solutions. The Institutes have been working in individual capacity as well as joining hands when multi Institutional and Multi-disciplinary approach is required to address the issues. The present review discusses the work carried out by different R & D Institutes and Academic Departments. The work shared by the lead researchers is shared. If any work in this period is missed, it is inadvertent. Studies at CSIR-National Environmental Engineering Research Institute Studies on geogenic contaminants namely Fluoride and Arsenic are being carried out at CSIR-NEERI. The studies are focussed on the assessment of fluoride and arsenic in groundwater quality and adopting suitable mitigation strategies. The high fluoride in the groundwater sources in the Chindwada district has been a cause of concern since it has led to both dental and skeletal fluorosis. High fluoride concentration exceeding the permissible limit (1.5 mg/L) is reported in many villages in the District by Central Ground Water Board (CGWB) in 2013. The presence of high fluoride in the groundwater was attributed to the granitic formations which underlie the top Basalts in the District. Accordingly, the PHED of Madhya Pradesh shifted to sinking of large diameter shallow wells to provide drinking water with fluoride within the permissible limit. CSIR-NEERI and CSIR-NGRI worked jointly in the 12 th plan (Year 2012-2017) for