Why is ocean dumping of sewage sludge prohibited in the United States and many coastal countries?

Ocean dumping of sewage sludge is prohibited in the United States and many other coastal countries because it is no longer considered a viable or environmentally responsible disposal method.1

While oceans contain vast volumes of water, their natural capacity to absorb pollutants is limited. Dumping sludge and other wastes can cause significant harm to marine life, particularly by damaging microscopic phytoplankton that form the base of the aquatic food web. Furthermore, hazardous debris and waste materials from such dumping can be washed back to shore, contaminating beaches and posing risks to public health.2

Because sewage sludge may contain toxic industrial chemicals and other contaminants, modern environmental engineering prioritizes safer alternatives, such as burial in a sanitary landfill, use as a fertilizer on non-food crops, or incineration with appropriate air pollution control measures. Protecting marine ecosystems from these pollutants is a fundamental ethical imperative to ensure the health of global aquatic environments.12