The Santa Monica Pier ranked among California's most polluted beaches for the fifth consecutive year, according to Heal the Bay's annual Beach Report Card.
Hundreds of sea lions and dolphins are dying along the California coast and experts believe it's due to high concentrations of toxic algae.
L.A. County has prevented trash from flowing into the ocean by using a device called "The Interceptor," which sits at the mouth of the Ballona Creek near Marina del Rey.
The Interceptor serves as a last line of defense against trash flowing into the Pacific Ocean by way of Ballona Creek.
Momoa co-founded a water company that promotes aluminum packaging and removes plastic from the ocean.
In addition to the fines and fees, the companies would also spend four years on probation and would be required to make a series of operational changes, including improved training, installation of a new leak-detection system and meeting notification requirements.