California voters approved Proposition 4 last year. It will yield $10 billion to pay for environmental projects and programs. Of that total, $50 million is earmarked to spend on water quality projects in the polluted Tijuana River. … San Diego Supervisor Paloma Aguirre flew to Sacramento to ask the State Water Resources Control Board on Tuesday for the full $50 million. … But Calexico Mayor Diana Nuricumbo said that her city is relying on its share of the $50 million to pay for upgrades to its wastewater treatment plant, which processes and cleans wastewater before discharging it into the New River. 

Other cross-border water news:

• Herald Review (Sierra Vista, Ariz.): Conservationists protect Southern Arizona wildlife amid wall construction