Tombstone, Arizona, USA

Drinking Water System Improvements in Tombstone, Arizona

Status: Completed


The purpose of the Project is to improve drinking water quality by blending Well No. 1 water with surface (spring) water to bring arsenic concentrations within the established maximum contaminant level (MCL) of 10 micrograms per liter (µg/l), which will contribute to the reduction of health risks associated with high levels of arsenic.


The project consists of improvements to the drinking water supply and to the water storage and distribution infrastructure, including replacement of the roof structure and liner at the surface water reservoir, pipeline replacement and the installation of control valves monitored by a new Supervisory Control and Data Acquisition (SCADA) system in the City of Tombstone, Arizona (the “Project”).


The Project is expected to generate environmental and human health benefits related to the following Project outcomes:

Provide improved drinking water quality for 718 residential service connections. 

Full compliance with regulatory standards for arsenic concentrations, which will be reduced to < 10 µg/L.

Project Financing

Total Project Cost US 0.75M
NADBank Funding US 0.5M - NADBank Grant: CAP