Arsenic in ground water of the Willamette Basin, Oregon

Water-Resources Investigations Report 98-4205
Prepared in cooperation with Oregon Water Resources Department
By:  and 



In response to increasing demands on ground-water resources in the Willamette Basin, Oregon (fig. 1), the Oregon Water Resources Department (OWRD) and the U.S. Geological Survey (USGS) began a cooperative study of the basin’s ground-water resources in 1996. This study was designed to increase the current understanding of the ground-water resource, and to better characterize the distribution of naturally occurring poor quality ground water in the basin. Essential components of the study of the physical ground-water resource are the development of a quantitative understanding of regional ground-water availability and flow, and of ground-water/surface-water interactions. Of paramount interest in the characterization of naturally occurring poor-quality ground water in the Willamette Basin is the distribution of arsenic in ground water, the subject of this report.

Arsenic contaminates many regional aquifer systems worldwide (Cantor, 1996; Thornton, 1996), and arsenic commonly is detected in ground water of the Willamette Basin at concentrations exceeding the U.S. Environmental Protection Agency (USEPA) current drinking water Maximum Contaminant Level (MCL) of 50 µg/L (micrograms per liter) (U.S. Environmental Protection Agency, 1996). Arsenic is associated with a number of adverse effects on human health. The USEPA considers arsenic to be a human carcinogen (U.S. Environmental Protection Agency, 1996). Examples of other adverse health effects attributed to consumption of arsenic range from weakness and abdominal pain to neurological and cardiovascular problems. A review of health effects associated with consumption of arsenic is given in a report by World Health Organization (1996).



Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Arsenic in ground water of the Willamette Basin, Oregon
Series title Water-Resources Investigations Report
Series number 98-4205
DOI 10.3133/wri984205
Year Published 1999
Language English
Publisher U.S. Geological Survey
Publisher location Portland, OR
Contributing office(s) Oregon Water Science Center
Description Report: iv, 28 p.; 1 Plate: 24.01 x 35.00 inches
Country United States
State Oregon
Other Geospatial Willamette River
Online Only (Y/N) N
Additional Online Files (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details