Which type of waste treatment unit is typically found on boats over 65 feet?

The correct choice reflects that Type III waste treatment units are specifically designed for the storage and containment of sewage aboard larger vessels, such as boats over 65 feet. These systems are typically used to hold waste until it can be properly disposed of at designated facilities. Unlike Type I and Type II units, which treat waste and discharge it overboard—Type III units do not treat but instead store waste for subsequent disposal, making them ideal for larger boats that may be out at sea for extended periods.

The design and function of Type III units align with regulations that aim to safeguard marine environments, especially in areas where water quality is a major concern. This type of unit helps ensure that waste management practices are compliant with environmental laws and guidelines, reducing the risk of pollution in navigable waters.