The contaminants identified on the U.S. Environmental
Protection Agency's Contaminant Candidate List
are a natural focus for monitoring by utilities, industry,
government, and academicians. If contaminants are
chosen that are not of real concern, then resources will
be wasted monitoring these contaminants while
contaminants of real concern are left unchecked.
Prioritizing contaminants for monitoring and for
consideration as candidates for regulation is complex.
Both occurrence and health effects data must be factored
into the decision. Often, data for unregulated
contaminants are scarce and difficult to interpret.
An understandable and repeatable process is necessary
in order to effectively assess, organize, summarize,
and use available data to prioritize contaminants
for further monitoring and regulation. Significant
progress has been made in mining and organizing
the available data, however the classification of
contaminants of potential concern still needs an
understandable approach.
The method proposed here will allow all stakeholders
to visualize and understand the relative priority of
contaminants that are of possible concern to the drinking
water industry.