National Water-Quality Assessment (NAWQA) Program

   Home    Headlines    Featured Studies    Liaison Committee    Informing Decision Makers    Data    Modeling/Software    Publications    Maps

General Information
About the Program
Glossary
Related Sites
Contact us

Chloride in Groundwater in the Glacial Aquifer System

Chloride concentrations were greater than the secondary maximum contaminant level established by the U.S. Environmental Protection Agency of 250 milligrams per liter in 2.5 percent of samples from 797 shallow monitoring wells (not drinking water) and in 1.7 percent of samples from 532 drinking-water supply wells. Water samples from shallow monitoring wells in urban areas had the largest concentration of chloride, followed by water samples from agricultural and forested areas (medians of 46, 12, and 2.9 milligrams per liter, respectively)

More information is available in the report: http://pubs.usgs.gov/sir/2009/5086/

map

Accessibility FOIA Privacy Policies and Notices

Take Pride in America home page. FirstGov button U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov/nawqa/home_maps/chloride_gw.html
Page Contact Information: gs-w_nawqa_whq@usgs.gov
Page Last Modified: Wednesday, 09-Jan-2013 12:09:42 EST