When considering a countertop with a waterfall edge, it's important to know how much weight it can support. After doing some research and consulting with experts, I've learned that the weight capacity of these countertops varies depending on the type of material used. For example, quartz or granite can typically hold more weight than marble or wood. Additionally, the thickness of the countertop also plays a role in its weight capacity. It's important to consult with your contractor or supplier for specific information regarding your chosen material and design to ensure that your waterfall edge countertop can safely support whatever you plan to place on it.