What is the code measurement for the flood level rim of a kitchen sink?

• A. 30 inches
• B. 34 inches
• C. 36 inches
• D. 40 inches

Answer: (C)

The flood level rim height is the vertical distance from the finished floor up to the top edge of the sink where water could reach if the sink is filled to the rim. In residential kitchens, this height is set to match standard countertop height, which is typically 36 inches above the finished floor. Sticking the rim at 36 inches keeps the sink alignment with the counter for easy use and proper plumbing fit, ensuring the drain and trap position are practical within the cabinet space. A 30-inch rim would sit well below common counter heights and feel awkward to use; 34 inches can occur in some layouts but the common code reference for this measurement in a standard setup is 36 inches; 40 inches would be too tall for most cabinets and workspace, leading to clearance and usability problems. Therefore, 36 inches is the expected code measurement for the flood level rim of a kitchen sink.