This document discusses the objects, location, and layout of a water treatment plant. The key objectives of water treatment are to remove pathogens, unpleasant tastes and odors, dissolved gases, color, and other impurities to make water safe for human consumption and industrial uses. The optimal location is near the water source and town to be supplied, away from pollution sources. A typical plant layout involves screening, sedimentation, aeration, filtration, disinfection, and sometimes softening to remove various contaminants in stages.