Final answer:
False. Water must be treated with several methods to be considered safe to drink.
Step-by-step explanation:
False. For water to be considered safe to drink, it must be treated with several methods, not just four distinct methods. Water treatment involves a combination of processes to remove contaminants and make the water safe for consumption. The common steps in water treatment include floculation, sedimentation, filtration, aeration, and disinfection. Public drinking water systems also add fluoride to prevent tooth decay. Additionally, there are various methods for treating water at home or during emergencies, such as filtration, boiling, distillation, water softeners, and reverse osmosis.