What should be ensured about all vents and overflows on a storage tank?

It is essential for all vents and overflows on a storage tank to be screened to prevent contaminants, insects, and debris from entering the tank. Screening these openings ensures that air can properly flow in and out while protecting the tank contents from environmental pollutants and potential biological contaminants. This helps maintain water quality by reducing the risk of contamination that can arise from external sources.

While painting the vents, cleaning them regularly, or insulating them might have their utilities in specific circumstances, screening directly addresses a fundamental need in water storage systems—protecting the integrity of the stored water. Therefore, the priority is to have protective screens on vents and overflows to enhance the safety and quality of the water supply.