Which regulations set limits on contaminants that primarily affect the aesthetic qualities of drinking water?

• A. Primary Drinking Water Regulations
• B. Secondary Drinking Water Regulations
• C. Title XIV Regulations
• D. Primary and Secondary Together

Answer: (B)

The main idea is the distinction between health-based standards and aesthetic standards. Primary drinking water regulations set enforceable limits to protect public health (maximum contaminant levels for contaminants that can affect health). Secondary drinking water regulations, on the other hand, address contaminants that mainly affect the water’s appearance and palatability—taste, odor, color, and related properties. They are non-enforceable guidelines (though some regions may adopt them as enforceable) to help maintain consumer acceptance of drinking water. Because this question focuses on contaminants that mainly influence how the water looks and tastes rather than health risk, the appropriate set of regulations is the secondary drinking water regulations.