What organizations must approve storage tank coatings that contact potable water?

The requirement for storage tank coatings that contact potable water is primarily focused on ensuring safety and compliance with health standards. The correct answer identifies organizations that oversee the safety and sanitation of materials used in contact with drinking water.

The Environmental Protection Agency (EPA) plays a crucial role in regulating water quality and establishing standards for materials that may affect potable water. Similarly, the National Sanitation Foundation (NSF) provides certifications for various components and materials used in water systems, ensuring they meet health and safety standards. The Food and Drug Administration (FDA) is involved because it regulates materials that come in contact with food and beverages, which includes potable water.

Together, these organizations provide a comprehensive framework of safety and sanitation that is essential for any coatings used on storage tanks in contact with drinking water. Their approval helps ensure that the materials used do not leach harmful substances into the water supply, thus protecting public health.