What is the preferred method for controlling sewage from watercraft?

The preferred method for controlling sewage from watercraft is the use of on-board holding tanks. These tanks are designed to store sewage safely until it can be properly disposed of at designated pump-out facilities. This method not only prevents the direct discharge of untreated sewage into water bodies, which can cause significant environmental harm and pose health risks, but also complies with regulations aimed at protecting aquatic ecosystems and water quality.

On-board holding tanks are effective in managing sewage in a way that allows for its transport to appropriate treatment locations, thereby minimizing contamination of water bodies and preserving marine life. This practice promotes responsible boating and environmental stewardship, contributing to cleaner waterways.

The other options, while they may have valid uses in certain contexts, do not align with the best practices for sewage management from watercraft in general. Overboard discharge can lead to pollution and is often regulated or prohibited in many areas. Incinerator toilets and compost toilets can be effective in land-based contexts but may not be practical or widely accepted solutions for sewage management on watercraft due to space, maintenance, and operational constraints.