Since becoming the Mexican ambassador to the U.S., Roberto Lazzeri has been confronted with many pressing cross-border issues, ranging from trade deals and border security to immigration. But he said there’s one in particular that comes up constantly in his many meetings in Washington — the Tijuana River Valley’s pollution crisis. The Mexican ambassador visited San Diego for the first time last week since taking the job in June. During his stay, he met with leadership from U.S. Customs and Border Protection, U.S. Border Patrol and the International Boundary and Water Commission, among others. … The Mexican ambassador to the U.S. said that Mexico is conducting a study to identify the most effective solutions. … Lazzeri said he hopes the study will determine whether to expand the [San Antonio de los Buenos wastewater] plant’s treatment capacity or construct additional infrastructure. 

Other Tijuana River news:

• CBS8 (San Diego): Study traces Tijuana River pollution ripple effects to La Jolla​
• FOX5/KUSI (San Diego): Tijuana River sewage impacts communities as far north as La Jolla, study finds​