E CONTENT
INTRODUCTION Water pollution is the contamination of water sources by substances which make the water unusable for drinking, cooking, cleaning, swimming, and other activities. Pollutants include chemicals, trash, bacteria, and parasites. All forms of pollution eventually make their way to water. Water pollution occurs when harmful substances often chemicals or microorganisms contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment. OBJECTIVES (1) to collect wastewater from residences, industries, institutions, and so on. (2) to find a place to discharge the waste wate (usually the nearest water course is chosen, but wastewater could also be used for groundwater recharge or even recycled to water supply). (3) to remove water pollutant that would produce adverse impacts to the receiving water or adversely affect the health of people subsequently using the water. SUBJECT MAPPING