Badly needed fixes to Tijuana’s wastewater system — which recently leaked millions of gallons of raw sewage into the Pacific Ocean, fouling beaches as far north as Coronado — may have to wait.

President Trump’s proposed budget released Thursday slashes funding for the Environmental Protection Agency by a whopping $5.7 billion dollars or 31 percent.

Those cuts include dollars for the U.S.-Mexico Border Water Infrastructure Grant Program, which officials in San Diego and elsewhere hoped would help fix Tijuana’s aging sewer pipes and an ailing water treatment facility along the coast of Baja California.

“President Trump’s budget proposal would rob us of that solution and make it more difficult to complete necessary repairs to help prevent this kind of spill from happening again,” Rep. Scott Peters, D-San Diego, said in a statement Thursday.

Officials in Mexico have said that efforts to upgrade Tijuana’s wastewater infrastructure have taken on a new urgency since a sewer pipe broke last month and spewed millions of gallons of raw sewage into river and eventually into South San Diego County beaches. But those efforts will likely need binational cooperation and funding.

If the EPA grants go away, rehabilitating Tijuana’s wastewater system will become significantly harder, said María Elena Giner, general manager at the Border Environment Cooperation Commission, which administers the federal dollars.

“At worst it will kill it. At best it will slow it down.” she said. “Eliminating program funds will result in greater deficiencies in infrastructure existing south of the border, which threatens health and prosperity of residents in the U.S.”

Diane Takvorian, executive director of the San Diego-based Environmental Health Coalition, said that her group received notice today that a previously approve grant from EPA to help preserve the Alamar River in Tijuana was abruptly pulled back.

“We expect that that project will be terminated,” Takvorian said.

Tijuana and other towns that border the U.S. have some of the best wastewater infrastructure in Mexico, in large part, due to U.S. grants and other federal programs that facilitate low-interest loans.

For example, in the 1990s, as much as 10 million gallons of raw sewage flowed daily into the Tijuana River and north across into San Diego’s coastal waters. After billions of dollars of investment on both sides of the border, nearly all wastewater collected in the city is now treated.