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Table 2-2. Components of Water Quality Standards
Water Quality
Standards Component Definition
Designated Uses Those uses specified in water quality
standards for each water body or segment
whether or not they are being attained
(40 CFR §131.3). Typical uses include
public water supplies, propagation of
fish and wildlife, recreation,
agriculture, industry, or navigation.
Water Quality Criteria Elements of State water quality standards,
expressed as constituent concentrations,
levels, or narrative statements,
representing a quality of water that
supports a particular use. When criteria
are met, water quality will generally
protect the designated use (40 CFR §131.3)
Antidegradation Antidegradation is a policy required in
State water quality standards to protect
their waters from degradation. At a
minimum, States must maintain and protect
the quality of waters to support existing
uses. Antidegradation was originally
based on the spirit, intent, and goals of
the Clean Water Act, especially the clause
"...restore and maintain the chemical,
physical, and biological integrity of the
Nation's waters".
Adapted from:
Water Quality Standards Handbook: Second Edition. 1994. EPA
823-B-94-005a. Office of Water.
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