Ocean pollution

Each year, billions of pounds of trash and other pollutants enter the ocean.

Where does pollution come from?

The majority of pollutants that make their way into the ocean come from human activities along the coastlines and far inland. One of the biggest sources of pollution is nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution can come from many sources, like septic tanks, vehicles, farms, livestock ranches, and timber harvest areas. Pollution that comes from a single source, like an oil or chemical spill, is known as point source pollution. Point source pollution events often have large impacts, but fortunately, they occur less often. Discharge from faulty or damaged factories or water treatment systems is also considered point source pollution.

Satellite image of Lake Erie on September 23, 2017. The bright green areas show the peak of last year's algal bloom – this year's bloom is predicted to be smaller.
NOAA is developing underwater robots to map, measure toxicity of Great Lakes algal blooms
Two underwater robots were deployed to autonomously monitor and measure the toxicity of harmful algal blooms in the Great Lakes.

Nutrients and algal blooms: Too much of a good thing?

Sometimes it is not the type of material, but its concentration that determines whether a substance is a pollutant. For example, the nutrients nitrogen and phosphorus are essential elements for plant growth. However, if they are too abundant in a body of water, they can stimulate an overgrowth of algae, triggering an event called an algal bloom. Harmful algal blooms (HABs), also known as “red tides,” grow rapidly and produce toxic effects that can affect marine life and sometimes even humans. Excess nutrients entering a body of water, either through natural or human activities, can also result in hypoxia or dead zones. When large amounts of algae sink and decompose in the water, the decomposition process consumes oxygen and depletes the supply available to healthy marine life. Many of the marine species that live in these areas either die or, if they are mobile (such as fish), leave the area.

Using ecological forecasting, NOAA is able to predict changes in ecosystems in response to HABs and other environmental drivers. These forecasts provide information about how people, economies, and communities may be affected. For example, the Harmful Algal Bloom Monitoring System developed by NOAA’s National Centers for Coastal Ocean Science provides information to the public and local authorities to help decide whether beaches need to be closed temporarily to protect public health.

The Trash Shouldn’t Splash Toolkit provides signage that can be used inside restaurants to encourage visitors to use alternatives to single-use plastic. The sign reads, "Think of our seas and be single-use plastic free!"
Creating a social norm: A student-designed program to reduce marine debris
In 2015, fifth graders from Falmouth, Massachusetts, noticed a problem. Although millions of metric tons of plastic waste were entering the ocean each year, the people around them kept using single-use plastics. In short, plastics were the norm. To address this problem, the students worked with Falmouth Water Stewards to create a campaign called “Skip the Straw.”

Marine debris

Marine debris is a persistent pollution problem that reaches throughout the entire ocean and Great Lakes. Our ocean and waterways are polluted with a wide variety of marine debris, ranging from tiny microplastics, smaller than 5 mm, to derelict fishing gear and abandoned vessels. Worldwide, hundreds of marine species have been negatively impacted by marine debris, which can harm or kill an animal when it is ingested or they become entangled, and can threaten the habitats they depend on. Marine debris can also interfere with navigation safety and potentially pose a threat to human health.

All marine debris comes from people with a majority of it originating on land and entering the ocean and Great Lakes through littering, poor waste management practices, storm water discharge, and extreme natural events such as tsunamis and hurricanes. Some debris, such as derelict fishing gear, can also come from ocean-based sources. This lost or abandoned gear is a major problem because it can continue to capture and kill wildlife, damage sensitive habitats, and even compete with and damage active fishing gear.

Local, national, and international efforts are needed to address this environmental problem. The Save our Seas Act of 2018 amends and reauthorizes the Marine Debris Act to promote international action, authorize cleanup and response actions, and increase coordination among federal agencies on this topic.

Garbage patches: What and where are they?

Garbage patches are large areas of the ocean where trash, fishing gear, and other marine debris collects. The term “garbage patch” is a misleading nickname, making many believe that garbage patches are "islands of trash" that are visible from afar. These areas are actually made up of debris ranging in size, from microplastics to large bundles of derelict fishing gear.

These patches are formed by large, rotating ocean currents called gyres that pull debris into one location, often to the gyre’s center. There are five gyres in the ocean: one in the Indian Ocean, two in the Atlantic Ocean, and two in the Pacific Ocean. Garbage patches of varying sizes are located in each gyre. Due to winds and currents, garbage patches are constantly changing size and shape. The debris making up the garbage patches can be found from the surface of the ocean all the way to the ocean floor.

The Cocos Lagoon Tire Reef to be removed and disposed of
50 years later: Clearing tires from Cocos Lagoon
In 1969, a team of Guam fisheries scientists installed an artificial tire reef within Cocos Lagoon as a way to reuse old rubber tires. Over 50 years later, the tire reef still sits on the bottom of the lagoon.

The impact of marine pollution on seafood

Heavy metals and other contaminants can accumulate in seafood, making it harmful for humans to consume. Microplastics can be ingested by fish and other species that filter their food out of the water. With more than one-third of the shellfish-growing waters of the United States adversely affected by coastal pollution, it’s important for NOAA and it’s partners to study the impacts of microplastics and harmful contaminants in seafood. There is ongoing research around the country focusing on the potential risk to wildlife and humans from debris exposure and ingestion. NOAA monitors seafood contamination and provides safety tips through the FishWatch program.

Marine debris is dangerous to wildlife even in the most remote places. This Hawaiian monk seal rests upon a derelict fishing net in Papahanaumokuakea Marine National Monument in the Northwestern Hawaiian Islands.
Derelict fishing gear research and recovery with Fishing for Energy
The Fishing for Energy​ program is a partnership between the National Fish and Wildlife Foundation, Covanta, and NOAA’s Marine Debris Program, and is dedicated to reducing derelict fishing gear that is lost, abandoned, or discarded in the marine environment.


Whether humans live near the coasts or far inland, they are a part of the problem — and the solution — to ocean pollution. Through this collection of resources and information, students can be informed of the types of pollution harming our ocean, and learn about actions they can take to prevent further pollution no matter where they live.

Updated April 2020