Two inland treatment plants in Tijuana, Arturo Herrera and La Morita, discharge treated wastewater into the Tijuana River. This project sends that water upstream of the Rodriguez Dam instead.
Why it matters
Even when treated, this water adds about 10 million gallons a day to the river, and treatment quality has been inconsistent. That's volume PB-CILA has to pump, and more water that crosses the border when the pumps can't keep up.
Where it stands (as of October 2026)
- Mexico began construction in February 2026. In September, EPA said it was on track to finish by December 2027.
- Phase 1 is expected in mid-2027 and costs $16 million. Phase 2 is expected in December 2027.
Who's responsible
Mexican state and federal agencies, as part of Mexico's commitments under the 2025 agreement.
What to watch
Phase 1 progress in EPA's quarterly updates.
Related
The map: upstream treatment plants. What reaches the ocean.
Sources
- U.S. EPA, Tijuana River watershed public updates, quarterly updates from November 2025 to September 2026