Cruise Ships Profit — Florida Waters Lose: Carnival Lines Failing Grade

As the state’s cruise industry expands, so does the flow of exhaust, wastewater, and garbage into surrounding seas — raising alarms about marine life, reefs, and tourism

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By Senior Staff Writer, Edmond Thorne for OmniCom MultiMedia

Florida News Network: Fort Lauderdale — Florida’s ports bustle at dawn. Passengers in sun hats stream up gangways, eager for their next Caribbean adventure. Behind the glittering decks and poolside bars, though, lies a less glamorous reality: each departing cruise ship leaves pollution in its wake, and Florida’s waters are paying the price. At the heart of much of Florida’s cruise pollution is Carnival Corp and its many cruise ship lines, which received an overall F-Grade for pollution from foe.org.

The state’s cruise industry has surged in recent years, cementing Florida as the nation’s undisputed cruise capital. More than 17 million passengers embarked from Florida ports in 2023, according to industry data. Yet this booming business comes with environmental costs that marine scientists, environmental groups, and coastal residents say can no longer be ignored. From exhaust fumes drifting over coastal cities to millions of gallons of contaminated water dumped at sea, the industry’s pollution footprint is expanding alongside its passenger count.

Black Smoke & Blue Skies: Cruise ships burn heavy fuel oil, a thick, tar-like substance left over after gasoline and diesel are refined. This cheap fuel powers massive engines but spews sulfur oxides, nitrogen oxides, and particulate matter into the air. In port cities like Miami, Tampa, and Port Canaveral, residents sometimes wake to hazy skies and acrid smells when ships idle near shore.

To address smokestack emissions, some vessels have installed exhaust gas cleaning systems, commonly called scrubbers. These devices spray seawater through exhaust to capture pollutants before they reach the atmosphere. Sounds like progress, right? Not quite. The scrubber water, now loaded with heavy metals, sulfates, and chemical residues, often gets discharged directly into the ocean. What was once air pollution becomes water pollution, dumped in the very marine corridors Florida’s tourism industry depends on.

The Environmental Protection Agency allows open-loop scrubbers in most U.S. waters, including off Florida’s coast. Critics argue that this trades one problem for another. A single large cruise ship can discharge tens of thousands of gallons of scrubber washwater daily, creating plumes of contamination near sensitive habitats. Want to know what your cruise line grade is for pollution? Click on the link: https://foe.org/wp-content/uploads/2024/11/CruiseShipReportCard_2024_final.pdf

Sewage, Sludge & Everything in Between: Exhaust and scrubber water are only part of the story. A typical cruise ship carrying thousands of passengers generates roughly 210,000 gallons of sewage and a million gallons of graywater each week, according to estimates from the Environmental Protection Agency. Graywater comes from showers, sinks, and laundry facilities, often containing detergents, oils, and other chemicals. Sewage, meanwhile, carries bacteria and nutrients that can fuel harmful algae blooms when released in coastal waters.

Then there’s bilge water — oily runoff that collects in the lowest part of the ship’s hull — and solid waste ranging from food scraps to plastic packaging. Despite regulations requiring treatment before discharge, enforcement remains spotty, and illegal dumping has been documented repeatedly. Companies have paid millions in fines for dumping untreated waste, yet violations continue.

Reefs Under Siege: Florida’s coral reefs, already stressed by warming ocean temperatures and disease, face additional threats from nutrient-laden wastewater and toxic discharges. Excess nitrogen and phosphorus from sewage feed algae blooms that block sunlight and smother coral. Heavy metals and chemical pollutants can weaken coral resilience, making it harder for reefs to recover from bleaching events.

The Florida Reef Tract, stretching from the Dry Tortugas to Martin County, supports commercial and recreational fishing worth billions of dollars. It also attracts snorkelers and divers whose tourism spending fuels coastal economies. When cruise ships dump waste near these reefs, they jeopardize both marine ecosystems and the livelihoods tied to them.

Marine biologists point out that pollution from cruise ships compounds other stressors. Fish populations decline, seagrass beds deteriorate, and beaches collect debris. Locals in the Keys have long complained about floating trash and discolored water after cruise ships pass nearby.

Regulations That Don’t Work: Federal law technically restricts how close to shore ships can discharge certain waste streams, but enforcement lags behind the scale of the problem. The Clean Water Act and the Act to Prevent Pollution from Ships set standards, yet limited Coast Guard resources and the vast expanse of ocean make monitoring difficult. Ships caught violating rules often pay fines that amount to a rounding error on their annual revenues.

Some environmental advocates have pushed for stricter state-level controls. Alaska, for instance, enacted tougher discharge limits years ago. California banned open-loop scrubbers in state waters. Florida, despite its vulnerability to marine pollution, has not adopted comparable measures. Industry lobbyists argue that overly strict rules could drive cruise lines to homeport elsewhere, costing jobs and tax revenue. It’s a tension that state lawmakers must navigate.

Florida Forward: Florida stands at a crossroads. The cruise industry brings economic benefits — jobs, taxes, and tourist spending — but the environmental toll is becoming harder to ignore. Without stronger regulations and better enforcement, the state’s marine ecosystems will continue to absorb the burden of this booming business.

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• Florida
• Carnival Cruise Lines
• Florida Pollution
• Florida Cruise Pollution
• Florida Water Pollution