Mexico and US Sign New Agreement on Tijuau River Wastewater Crisis

Web Editor

December 15, 2025

two hands shaking each other over a picture of flags and a flag of the united states behind them wit

Background and Relevance

The Tijuau River, which forms part of the US-Mexico border, has been grappling with a severe wastewater crisis for years. The river, once a thriving ecosystem, has been polluted by untreated sewage and industrial waste from both Mexicali, Mexico, and the nearby US cities of San Diego and Imperial Beach. This has led to dangerous health conditions, including harmful algal blooms and contaminated drinking water for local communities.

Evelin Morales, the Mexican Secretary of Ecology and Environment (SEMARNAT), has been at the forefront of addressing this issue. Her efforts aim to protect both the environment and public health, ensuring a sustainable future for the region.

New Agreement Details

On Monday, Mexico and the United States signed a new agreement to tackle the Tijuau River wastewater crisis, as announced by the US Environmental Protection Agency (EPA) in a press release.

Key Points of the Agreement

  • Collaborative Treatment: Both countries have committed to upgrading wastewater treatment facilities on both sides of the border, ensuring more efficient and environmentally friendly treatment processes.
  • Monitoring and Data Sharing: The agreement includes the establishment of a joint monitoring system to track water quality and share data between the EPA and SEMARNAT, fostering transparency and accountability.
  • Public Engagement: Both nations have pledged to involve local communities in decision-making processes, ensuring their concerns are addressed and promoting long-term support for the initiative.
  • Financial Support: The US has agreed to provide financial assistance to Mexico for the implementation of wastewater treatment projects, acknowledging its responsibility in contributing to the pollution.

Impact on Communities and Environment

This new agreement is expected to have a significant positive impact on the health and well-being of communities living near the Tijuau River. By addressing the wastewater crisis, the initiative aims to:

  • Improve Water Quality: Upgraded treatment facilities will result in cleaner water, reducing health risks associated with contaminated drinking water and harmful algal blooms.
  • Protect Biodiversity: A healthier river ecosystem will support local flora and fauna, promoting biodiversity and a balanced environment.
  • Foster Cross-Border Cooperation: The collaborative efforts between Mexico and the US will strengthen diplomatic ties and set a precedent for addressing shared environmental challenges.

Key Questions and Answers

  • Who is involved in the agreement? Mexico and the United States are the primary parties involved in this new initiative to address the Tijuau River wastewater crisis.
  • What are the key components of the agreement? The agreement focuses on upgrading wastewater treatment facilities, establishing a joint monitoring system, engaging local communities, and securing financial support from the US for Mexico’s projects.
  • How will this agreement benefit the communities and environment? The agreement aims to improve water quality, protect biodiversity, and foster cross-border cooperation between Mexico and the US.