Copyright © 2018 Authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7 (3.23) (2018) 5-10 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper An Overview on Water Quality Trending for Lake Water Classification in Malaysia Muhammad Muzzammil Shahabudin 1* , Sabariah Musa 2 1 Post Graduate, Faculty of Civil and Environmental Engineering, University Tun Hussein Onn Malaysia, 86400, Batu Pahat, Johor, Malaysia 2 Senior Lecturer, Faculty of Civil and Environmental Engineering, University Tun Hussein Onn Malaysia, 86400, Batu Pahat, Johor, Malaysia * Corresponding author E-mail: m.muzzammil6852@gmail.com Abstract Lake water is important to all life and surroundings with multiples benefits and forms either in natural or man-made conditions. One of the most well-known tools for assessing the water quality is Water Quality Index (WQI) and widely used including Malaysia. Lake water quality should be represented in lucid way like other surface water regarding to the WQI standards for water quality assessment on lakes. This paper aims to review on lake water quality classification and its uses based on WQI standards in Malaysia. In this review, the uses of WQI for assessing the lake water and functioned of lakes are discussed. Results on pH from 5.0 to 9.2, BOD in mg/l from 0 to 180, COD in mg/l from 5 to 150, SS in mg/l from o to 1800, DO in mg/l from 0 to 8 and AN in mg/l N from -1 to 26. Variety of numbers is due to different loading of pollutions and location. With used of WQI on lake water quality assessments, further action can be taken for the uses on water resources by maintaining the quality. It also will broaden the uses of lake water as alternative of water resources in Malaysia. Keywords: Lake water, water characteristics, water quality. 1. Introduction This Generally lakes functioned as thermal structures, habitats for organisms and support food chain also playing an important role also as nutrient providers to marine life [1]. Lake water is one of the surface water sources play an important role as basic water resources as water is needed for the whole life of human beings and associated activities [2], [3]. As time change, development and population has increased the number of pollutant released into water bodies and deteriorating the quality and ecological system [4], [5]. Lake also affected with the change that comes from anthropology or natural factors [2]. Lake is important as a part of water resources both in quality and quantity of water as water also needs by various human sector such drinking water supply and irrigation [6]. Model in water quality monitoring first introduced by Horton in 1965 [7] before upgraded into various methods by experts such [8]–[10]. Other than WQI scales, monitoring of the water quality also can be based on Interim National Water Quality Standards (INWQS) for Malaysia [11], also ecological model methods for water quality prediction [12]. WQI scales provides simples scales by making collection data into single index value which denoting the water quality condition level [5]. In Malaysia, guidelines of WQI are enrolled by Department of Environment of Malaysia (DOE) based on six (6) major parameters which are dissolved oxygen (DO), pH value, biological oxygen demand (BOD), che- mical oxygen demand (COD), total suspended solid (TSS) and ammonical nitrogen (AN) [5]. Through the classification, water will be grouped as ‘clean’, ‘slightly polluted’ and ‘polluted’ if the standards complies within the range of 81 to 100%, 60 to 80% and 0 to 59%, respectively [13]. As there is no any national standards or guidelines upon lake wa- ter, classification on water assessment for the lake water mostly are based on DOE’s WQI standards as the lake water are ass o- ciated as surface water [14]. Focus in this paper is looking on the trending of water characteristics in several lake also the use of lakes from Malaysia spectrum. 2. Lake Water Characteristics Lake water characteristics in Malaysia still depending on DOE’s WQI tools as there are no any national guidelines on lake water in Malaysia and it classified as surface water. Putrajaya is one of the states in Malaysia has their own lake water guidelines. Character- istic for lake water on Putrajaya guidelines goes into physical, microbiological constituents, radioactivity, and organics indicators [14], [15]. Practiced on WQI as part of water quality monitoring have been done previously in several studies by [2], [16]–[18]. Some studies also comes with several others parameters such electrical conduc- tivity (EC), redox potential (Eh), resistivity, salinity, temperature, sulphate, phosphate, oil and grease and hardness [6], [18], [19]. In water assessment, evaluation for lake water are made on three main factors that widely used where are physical, chemical and biological expressions for water classification and used [20]. All the parameters will present as a step of evaluating the watercourse