Yuma, Arizona, USA

Construction of the Wastewater Collection System for the B & C Colonia in Yuma County, Arizona

Status: Completed construction


The Avenue B&C Colonia is located in Yuma County, surrounded by the City of Yuma,  Arizona. The  B&C Colonia  did not have a wastewater collection (WWC) system and the WW was treated through the use of latrines, cesspools, and septic tanks. However, due to its proximity to the Colorado River, pooling of WW on the surface was common due to the shallow water table. The state of Arizona required the formation of an Improvement District before this unincorporated community could request any funding for the project.


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 the provision of a wastewater collection system to the un-served area of Avenue B & C Colonia in Yuma, Arizona. Collected wastewater is conveyed  to an existing wastewater treatment plant.

Project Financing

Total Project Cost US 22.01M
NADB Funding US 2.25M - NADB Grant: BEIF
Other Funding Partners Arizona WIFA - US 1.4M
USDA Grants - US 10.8M
USDA Loan - US 2.0M

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


Quantity of uncollected wastewater discharges eliminated

245,362 GPD



Wastewater connections


Wastewater collection lines 8"-16" dia (miles)


6”dia PVC Force main (miles)


Significant project finding(s)

Formation of an Improvement District required a significant public engagement effort supporting success and sustainability for the project's implementation.