Nondegradation Protection of High Quality Waters€¦ · No degradat\൩on of outstanding resource...
Transcript of Nondegradation Protection of High Quality Waters€¦ · No degradat\൩on of outstanding resource...
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Nondegradation: Protection of High Quality Waters
Amy Steinmetz MT DEQ Water Quality Standards and Modeling Section [email protected]
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Three “Tiers” for Nondegradation • Outstanding resource waters • High quality waters • All state waters
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Outstanding Resource Waters • Highest level of protection • Equivalent to EPA’s “tier 3” waters • Water bodies entirely within the boundary of a national park
or wilderness area • Water bodies designated by the BER and approved by the
legislature • Degradation not allowed
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High Quality Waters • Middle level of protection • Equivalent to EPA’s “tier 2” waters • Water bodies with assimilative capacity, i.e. the water quality
is better than the water quality criterion • Montana uses a parameter-by-parameter approach • New or increased sources of pollution must undergo a
nonsignificance review
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All State Waters • Lowest level of protection • Equivalent to EPA’s “tier 1” waters • Water bodies that are impaired • Existing uses must be protected
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Three “Tiers” for Nondegradation • Outstanding resource waters • High quality waters • All state waters
Increasing levels of protection as we climb from the bottom tier to the top tier.
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Why Nonanthropogenic is Difficult
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Looking Forward
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Questions?