This document provides details for a federal contract solicitation to improve a wastewater treatment facility on tribal lands. The solicitation seeks a contractor to renovate and expand an existing 32.6-acre, six cell lagoon facility to a 49-acre, five cell treatment system. This acquisition is set aside for Indian Small Business Economic Enterprises in accordance with the Buy Indian Act. The solicitation is issued by the Department of Health and Human Services Indian Health Service for the Zuni Wastewater Treatment Improvements project. The contractor shall furnish all labor, materials and equipment for the construction of the improved wastewater lagoon treatment facility through a two-phase approach.