The environmental group Friends of the Earth, represented by Earthjustice, has filed a lawsuit in federal court seeking what it calls more effective regulation of sewage discharges from cruise ships and other vessels in U.S. waters.

In a prepared statement, Friends of the Earth said that cruise ships alone dumped more than 1 billion gallons of sewage in the ocean last year and much of it was poorly treated. In addition, it stated, tens of thousands of ocean-going vessels like cargo ships and oil tankers discharged even more inadequately treated sewage into coastal waters.

The group said that the number and size of ships in U.S. waters continues to rapidly expand while federal standards governing their sewage discharges remain more than 35 years out of date. It said: “Cruise ships with populations the size of small towns ply the waters off our coasts and massive cargo ships carrying goods to our ports produce and then dump large amounts of partially treated sewage and other wastes into our oceans. This waste pollutes our beaches, contaminates our coral reefs, and destroys our valuable marine ecology. Sewage contamination also puts swimmers at elevated risk of illness and can make seafood caught by coastal fishermen unsafe to eat. Additionally, discharges from ships disrupt coastal economies. In 2012, ship sewage contributed to elevated levels of fecal coliform that led to more than 31,000 days of beach advisories and closings.”

Marcie Keever, Oceans and vessels program director at Friends of the Earth, said in a prepared statement: “Sewage-contaminated waters not only harm sea life, but also harm people who use these waters. These ship sewage discharges contribute to the risk of serious, potentially life-threatening health effects such as gastrointestinal illnesses, hepatitis, ear nose and throat illnesses, vomiting, and respiratory diseases. The EPA reported in 2000 that its ship sewage treatment standards were out of date and needed an update. After 38 years, it is time for EPA to act.”

According to the organization, U.S. environmental laws have not kept pace with growth of the industry. In certain regions, including New England and California, ship sewage discharges close to shore have been banned. However, the Northwest, the Gulf of Mexico and almost the entire Southeast remain unprotected from ship sewage. New laws and standards are urgently needed to protect all of our ocean waters.

“The EPA is required under the Clean Water Act to protect people who swim, boat, and fish in waters affected by ship sewage discharges,” said Andrea Treece of Earthjustice, who filed the lawsuit for Friends of the Earth. “Modern sewage treatment options are available for relatively low cost, but EPA hasn’t updated it regulations to reflect those advances since 1976. As a result, ships can dump bacteria-laden wastewater in some of our most valuable waters.”

Sewage releases near shellfish beds can be particularly dangerous to public health, according to Friends of the Earth, which said that when eaten raw or undercooked, contaminated shellfish can pose considerable health risks to humans who consume them. Coral reefs are also vulnerable to harm by sewage discharges from marine vessels. Pathogens from sewage can cause disease and scarring in many coral species. Nutrients from sewage, like nitrogen and phosphorus, promote excessive algal growth, which consumes oxygen in the water and can smother reefs and the marine ecosystems they support.

Released last year, a Cruise Ship Report found that most ships have installed advanced sewage treatment systems, but not all, some of which received “failing grades” by Friends of the Earth.