Both United States and Mexican officials announced separate plans Tuesday to upgrade Tijuana River wastewater facilities.

The international river has been a longtime problem for residents of Imperial Beach and Tijuana, as sewage and trash from the river have spilled into the Pacific Ocean for decades, often closing beaches near the border and damaging natural habitats along the river.

The Tijuana River straddles the U.S.-Mexico border, picking up sewage and trash along its winding and cross-border path. Over the last 40 years water- treatment facilities have been overrun with sewage and trash, especially during the rainy season.