Which method is preferred for controlling sewage from watercraft?

On-board holding tanks are considered the preferred method for controlling sewage from watercraft as they provide a safe and effective way to manage waste. Holding tanks are designed to contain sewage until it can be properly disposed of at a designated pump-out station. This method prevents contamination of water bodies, which can occur if sewage is discharged directly into the water, thereby safeguarding aquatic ecosystems and public health.

Using holding tanks minimizes the risk of nutrient loading and pathogen exposure that can arise from overboard discharges, even in large bodies of water. It ensures that waste is managed appropriately and processed in compliance with environmental regulations, reducing the likelihood of pollution incidents. This method also aligns with best practices in environmental health and sanitation, as it allows for controlled and responsible waste management.

In contrast, other methods like overboard discharges, incinerator toilets, and compost toilets may not provide the same level of safety, reliability, and compliance with environmental health standards. While those methods have their own applications, they may not be suitable for all circumstances or may not offer the same degree of pollution control as holding tanks do.