What is the primary purpose of water treatment facilities?

The primary purpose of water treatment facilities is to purify water for safe consumption. These facilities are designed to take raw or untreated water, which can contain various contaminants, and process it through a series of steps that typically include filtration, chemical treatment, and disinfection. This treatment ensures that the water meets health and safety standards set forth by regulatory agencies, making it safe for drinking and other uses by the public.

Other options, while related to water management, do not encapsulate the primary function of treatment facilities. Collecting rainwater is typically part of a rainwater harvesting strategy but is not the main focus of treatment plants. Storing water for industrial use is generally managed through supply reservoirs rather than treatment operations. Providing irrigation for agriculture pertains to agricultural water management rather than the specific function of purifying drinking water. Hence, the emphasis of treatment facilities is squarely on ensuring the water is safe and clean for consumers, which is captured in the correct choice.