Water pollution & water quality assessment based on water quality index method for Johor rivers

Nurshahira Mohammad Noh, . and Lariyah Mohd Sidek, . and Hairun Aishah Mohiyaden, . and Amirah Hanim Mohd Puad, . and Md. Khairi Selamat, . and Azril Fitri Zaabah, . and Hidayah Basri, . (2020) Water pollution & water quality assessment based on water quality index method for Johor rivers. Journal of Energy and Environment (Malaysia), 12 (2). pp. 1-7. ISSN 1985-7462

The Johor river basin is currently facing degradation of its water quality. Johor River is divided into 20 sub-basins where the upstream portion of the basin is still covered with natural forest and swampy area. Meanwhile, the midstream part of the basin is a mixture of land use and the downstream part occupied with industrial activity. This study aims to identify the sources of pollution and water quality classification using the Water Quality Index (WQI) method. The WQI is used to indicate the level of pollution and the corresponding suitability in terms of water uses according to the National Water Quality Standards for Malaysia (NWQS). This study also considers the proposed New Water Quality Index (NWQI). Results show that the upstream part of the Johor River basin is dominant by Class II and Class III. River status at the midstream part gradually changes to Class III and degrade continuously to Class IV and V as it goes downstream. The high development of industrial activities at the downstream part causing the river polluted with the receiving of treated and untreated industrial effluent.

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Abstract

The Johor river basin is currently facing degradation of its water quality. Johor River is divided into 20 sub-basins where the upstream portion of the basin is still covered with natural forest and swampy area. Meanwhile, the midstream part of the basin is a mixture of land use and the downstream part occupied with industrial activity. This study aims to identify the sources of pollution and water quality classification using the Water Quality Index (WQI) method. The WQI is used to indicate the level of pollution and the corresponding suitability in terms of water uses according to the National Water Quality Standards for Malaysia (NWQS). This study also considers the proposed New Water Quality Index (NWQI). Results show that the upstream part of the Johor River basin is dominant by Class II and Class III. River status at the midstream part gradually changes to Class III and degrade continuously to Class IV and V as it goes downstream. The high development of industrial activities at the downstream part causing the river polluted with the receiving of treated and untreated industrial effluent.

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Item Type:	Article
AGROVOC Term:	water pollution
AGROVOC Term:	water quality
AGROVOC Term:	environmental monitoring
AGROVOC Term:	freshwater ecosystems
AGROVOC Term:	hydrology
AGROVOC Term:	data collection
AGROVOC Term:	data analysis
AGROVOC Term:	water sampling
AGROVOC Term:	pollutants
AGROVOC Term:	environmental impact assessment
Geographical Term:	Malaysia
Depositing User:	Nor Hasnita Abdul Samat
Date Deposited:	21 Nov 2025 10:05
Last Modified:	21 Nov 2025 10:05
URI:	http://webagris.upm.edu.my/id/eprint/1564

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