The primary source of marine pollution along the Pacific Coast is Plastic waste.

Plastic waste is the leading source of marine pollution along the Pacific Coast, significantly impacting marine ecosystems and coastal environments. Each year, tons of plastic waste—from single-use items like bottles, bags, and food packaging—finds its way into the ocean. This waste often breaks down into microplastics, which are consumed by fish and other marine animals, leading to health issues that can travel up the food chain to affect humans. Additionally, plastic debris harms marine life through ingestion and entanglement, causing injury and death. Efforts to address plastic pollution along the Pacific Coast include promoting reusable materials, implementing stricter regulations on plastic production and disposal, and organizing beach cleanups to prevent debris from entering the ocean.