Playas de Rosarito, Baja California, Mexico

Improvements to the Water and Wastewater Systems in Rosarito, Baja California

Status: Completed


At the outset of the project, the majority of the low income communities of Playas de Rosarito had inadequate wastewater (WW) services. WW was disposed of through latrines, cesspools and, in some instances, directly to the surface waters which discharge to the Pacific Ocean and indirectly affect coastal resources in the US. The project’s biggest challenge was the difficult negotiations with the land owners (Ejido Mazatlan), which  complicated  the  development of the project and caused modifications to the original collector alignments. This project is referred to as Rosarito I.


The purpose of the project was to eliminate exposure to untreated wastewater discharges by expanding the wastewater collection system to  the  unserved  areas, reducing groundwater pollution and the risk of waterborne diseases.


The project consisted of improvements to the wastewater collection system to unserved areas of Poblado Morelos, La Mina, Colinas de Rosarito, Colinas de Montecarlo and Santa Lucia in Playas de Rosarito. Collected WW is now conveyed to existing Rosarito I and Rosarito Norte WWTPs.

Project Financing

Total Project Cost US 10.03M
NADB Funding US 1.16M - NADB Loan
US 2.58M - NADB Grant: BEIF

Project Photos

Results Measurement

Results are measured upon completion of the project through a closeout process that assesses project performance within 6-12 months after completion, as well as the achievement of the goals and objectives established at the time of project certification and financing approval.


Increase access and use of safe and sanitary wastewater collection services

Reduction of untreated wastewater discharges to water bodies


Actual (2013)

Increased number of new connections (Target based on full build out; Actual based on existing occupied homes with service)


Quantity of uncollected wastewater discharges eliminated

0.23 MGD



Wastewater connections


Wastewater collection lines (miles)


Significant project finding(s)

Access to WWC in the Project areas was provided as planned and sewer lines can provide service to over 19,000 residents.