Cruise ships dump waste in ports, at sea, and through licensed waste management contractors — the location depends on the type of waste and where the ship is operating

Cruise ships generate thousands of tons of waste per voyage: sewage, food scraps, gray water from sinks and showers, hazardous materials, and solid garbage. The ship cannot straightforward throw it overboard anymore. U.S. federal law and international maritime treaties now require waste to go to licensed shore facilities, incinerators on the ship itself, or designated ocean dumping zones far from land — each with different rules about where and how.

The most common route is a port facility. When a ship docks, waste barges pull alongside and pump out sewage and gray water into trucks bound for municipal treatment plants. Solid waste — food, packaging, paper — goes into dumpsters and then to landfills or recycling centers. Some ships incinerate waste at sea in approved incinerators, which reduces volume but requires permits and monitoring. A small amount of certain waste can still be dumped in the ocean, but only in specific zones, far from shore, and only if the ship is moving.

Key Takeaways

  • Sewage and gray water from cruise ships must go to port facilities or be treated and discharged in designated ocean zones, not dumped near populated coasts.
  • The U.S. Environmental Protection Agency and the International Maritime Organization set the rules; violations can result in fines of millions of dollars.
  • Cruise lines are required to keep waste logs and report what they dump, where, and when — records that are open to public inspection.
  • Food waste and solid garbage typically go to landfills or recycling at ports, though some ships incinerate waste at sea under strict conditions.
  • Illegal dumping has happened and resulted in criminal charges against cruise lines; the largest fine was over $40 million.

What types of waste cruise ships produce and where each goes

Cruise ships produce five main categories of waste, each with its own disposal rules. Sewage — human waste and toilet water — must go to a port treatment facility or be treated on the ship and discharged only in approved ocean zones at least 12 nautical miles from shore. Gray water — from sinks, showers, and laundry — has looser rules; it can be discharged closer to shore if the ship is moving, though many lines treat it anyway.

Food waste can be ground and discharged at sea if the ship is at least 12 nautical miles from land, but most cruise lines collect it at ports and send it to landfills or composting facilities. Solid waste — cardboard, plastic, paper, glass — stays on the ship until port, where it goes to dumpsters and then to local waste management. Hazardous waste — paint, solvents, batteries, fluorescent bulbs — must be offloaded at certified facilities and cannot be dumped at sea under any circumstance.

Federal and international rules that govern where waste goes

The U.S. Environmental Protection Agency enforces the Act to Prevent Pollution from Ships (APPS), which applies to all vessels in U.S. waters. The law requires ships to maintain a waste management plan, keep detailed logs of what they dump and where, and report violations. Penalties for illegal dumping start at $250,000 per violation and can reach millions.

Internationally, the International Maritime Organization sets standards through Annex V of the MARPOL treaty, which most countries have signed. MARPOL divides the ocean into zones and sets different rules for each: some zones allow no dumping at all, others allow certain waste only at specific distances from shore. Ships must carry an International Garbage Certificate proving they meet the standard, and port states can inspect the ship's waste logs at any time.

The Coast Guard boards cruise ships regularly to check compliance. If a ship's logs do not match what inspectors find — for example, if the log says waste was dumped in an approved zone but the ship's GPS shows it was closer to shore — the ship faces investigation and potential criminal charges. Several major cruise lines have paid settlements in the hundreds of millions of dollars for systematic illegal dumping over years.

How waste logs work and what they reveal

Every cruise ship keeps a garbage record book, a detailed log of what waste left the ship, when, where, and how. The log must include the date, time, location (latitude and longitude), type of waste, amount, and method of disposal. If waste went to a port facility, the log names the facility and the contractor who received it. If waste was discharged at sea, the log records the exact coordinates and confirms the ship was in an approved zone and moving.

These logs are public records. Environmental groups and journalists have obtained them through Freedom of Information Act requests and found discrepancies — logs showing waste dumped in zones where dumping was illegal, or timestamps that do not match the ship's movement. In 2016, Royal Caribbean pleaded guilty to dumping hazardous waste and making false entries in its garbage logs; the company paid $40 million in fines and restitution. In 2019, Carnival Corporation settled charges of dumping oily waste and falsifying records for $20 million.

You can request a cruise ship's waste logs from the EPA or the Coast Guard. The request takes weeks to process, but the documents show exactly what the ship did on your voyage and whether it followed the law.

Port facilities and what happens to waste after it leaves the ship

When a cruise ship docks, waste contractors meet it with barges, trucks, and pumping equipment. Sewage and gray water are pumped into tanker trucks and taken to the local municipal wastewater treatment plant, where it is treated the same way as sewage from homes and businesses. Solid waste goes into dumpsters and is transported to the local landfill or recycling center. Hazardous waste goes to a certified hazardous waste facility.

The cost of offloading waste at a port is significant — thousands of dollars per voyage — which is one reason some cruise lines have been caught cutting corners. A ship that docks in a port with expensive waste facilities may illegally dump in international waters to avoid the fee. Ports in the Caribbean and Mediterranean have been particular targets because enforcement is weaker and the ocean is heavily trafficked, making detection harder.

Some ports have invested in better facilities to attract cruise ships and may support waste is handled properly. Port Everglades in Fort Lauderdale, for example, has dedicated waste reception facilities and requires all cruise ships to use them. Other ports lack the infrastructure and cruise ships must wait or travel to the next port to offload.

Incineration at sea and when it is permitted

Cruise ships can incinerate waste at sea if they have an approved incinerator and the right permits. Incineration reduces waste volume by up to 90 percent, which saves space on the ship and reduces the amount that must be offloaded at ports. However, the incinerator must meet strict emission standards and the ship must be at least 12 nautical miles from shore. The ship must also keep records of what was burned, when, and where.

Not all cruise lines use incineration. Larger ships often have incinerators because they generate enough waste to justify the equipment and fuel cost. Smaller ships typically collect waste and offload it at ports. Incinerators are also expensive to maintain and require trained operators, so some cruise lines choose to pay port fees instead.

Environmental groups have raised concerns about incinerator emissions, particularly heavy metals and particulates. The EPA has tightened emission standards over the years, and newer incinerators are cleaner than older ones. However, enforcement at sea is difficult because inspectors cannot board a ship while it is burning waste. The agency relies on the ship's self-reporting and occasional port inspections.

What illegal dumping looks like and how it gets caught

Illegal dumping typically involves one of three methods: discharging sewage or oily waste in coastal waters where it is prohibited, falsifying waste logs to hide the dumping, or bypassing the waste treatment system entirely by opening a valve directly to the ocean. Some cruise lines have installed hidden pipes that bypass the treatment system, allowing crew to dump waste without it being recorded.

Detection happens through several routes. Coast Guard inspectors board ships and compare the garbage logs to the ship's GPS data and fuel consumption records. If a ship claims to have incinerated 50 tons of waste but the fuel logs show no spike in consumption, the numbers do not add up. Environmental groups have also used satellite imagery and ship tracking data to catch vessels dumping in prohibited zones. In one case, a whistleblower crew member reported illegal dumping to the EPA, leading to a criminal investigation.

Penalties are severe. Beyond fines, cruise lines can face criminal charges, loss of operating permits, and damage to their reputation. Passengers have also sued cruise lines for environmental harm and false advertising — booking a cruise marketed as "eco-friendly" only to learn the ship was dumping illegally. These lawsuits have resulted in settlements and forced cruise lines to upgrade their waste systems.

How to find out what a specific cruise ship dumps

You can obtain a cruise ship's waste logs through a Freedom of Information Act request to the EPA or the Coast Guard. The request should include the ship's name, the dates of the voyage you are interested in, and a request for the garbage record book and any inspection reports. The process takes four to eight weeks and may cost a small fee for copying.

Environmental organizations including Oceana and the Sierra Club have published databases of cruise ship violations and fines. These databases are searchable by ship name and cruise line and show what violations were found, when, and what penalties were imposed. News outlets including the Miami Herald and the Wall Street Journal have also investigated cruise ship dumping and published detailed reports with specific examples.

If you witness a cruise ship dumping waste illegally, you can report it to the Coast Guard's National Response Center at 1-800-424-8802 or to the EPA's environmental violations hotline. Include the ship's name, location, date, time, and a description of what you saw. Reports are investigated if there is enough detail to identify the vessel and the incident.

Frequently Asked Questions

Can cruise ships dump sewage in the ocean?

Yes, but only in specific circumstances. Sewage can be discharged at least 12 nautical miles from shore if the ship is moving and the discharge meets treatment standards. In U.S. waters, the rules are stricter: sewage must go to a port facility or be treated on the ship and discharged only in approved zones far from the coast. Most cruise ships offload sewage at ports to avoid the complexity of at-sea discharge.

What happens to food waste from cruise ships?

Food waste can be ground and discharged at sea if the ship is at least 12 nautical miles from land, but most cruise lines collect it at ports and send it to landfills or composting facilities. Some ships incinerate food waste to reduce volume. The waste log must record which method was used, when, and where.

How much does it cost a cruise ship to offload waste at a port?

Costs vary by port and type of waste but typically range from $5,000 to $15,000 per port call. Sewage offloading is the most expensive because it requires specialized equipment and treatment. This high cost is one reason some cruise lines have been caught dumping illegally — the financial incentive to avoid port fees is significant.

Are cruise ship waste logs public?

Yes. Garbage record books and Coast Guard inspection reports are public records and can be obtained through a Freedom of Information Act request. Environmental groups and journalists have used these records to document illegal dumping and hold cruise lines accountable.

What is the biggest fine a cruise line has paid for illegal dumping?

Royal Caribbean paid $40 million in 2016 for dumping hazardous waste and falsifying garbage logs. Carnival Corporation paid $20 million in 2019 for similar violations. These settlements included criminal fines, civil penalties, and restitution for environmental harm.