Assessment of Total Chromium in Illinois Community Water Supplies
In response to the Environmental Working Groupís recent report on the presence of chromium-6 in
drinking water, U.S. EPA will work with state and local officials to better determine how wide-
spread and prevalent this contaminant is. When U.S. EPA finishes their guidance and approved
sample method for chromium-6, it will be used to develop a network to scientifically assess the
prevalence of chromium-6 in source water (surface and groundwater), drinking water, and public
water supply distribution systems. This information will help to prioritize U.S. EPAís technical
assistance and guidance. Moreover, it will also assist U.S. EPA with the question of prevalence
and need to establish a drinking water standard.
Illinois EPA believes that it is very important that we start with a sound understanding and
assessment of what we know relative to total chromium in Illinois ground and surface water
(including Lake Michigan) used as a source of public water supply. To that end, Illinois EPA has
developed a Chromium-6 Strategic Plan. The statistically designed network to sample for Chromium-6 and total Chromium can be found in the Chromium-6 Strategy Update. The Illinois EPA has also prepared a fact sheet entitled “Assessment of Total Chromium in Illinois Community Water Supplies”
which references data for
drinking water quality for total chromium, as well as source water quality for total chromium
from surface water and groundwater sources.