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8/6/15 The 2015 addendum to the low pH TMDL for the Great Smoky Mountains National Park, TN is available for public comment
8/1/2014 EPA has partially approved the 2014 303(d) list
7/16/2014 The 303(d) Listing Methodology public comment period has been extended to September 30, 2014.
5/30/14 The 303(d) Listing Methodology is available for public review
4/3/14 EPA approved Addendum#2 to the Jordan Lake TMDL for turbidity and high pH
1/16/14 The Draft Addendum#2 to the Jordan Lake TMDL is available for public comment
1/13/14 The Draft 2014 303(d) List is available for public comment
The Modeling and Assessment Branch uses computer models and data analyses to simulate and assess surface water resources. Staff are responsible for developing and reviewing water quality models for TMDLs, NPDES permitting, and management strategies; developing and reviewing basin hydrologic models for water supply planning; trend and other data analyses; water quality and natural conditions assessments; prioritizing impaired waters for management strategy or TMDL development; and developing TMDLs or TMDL alternatives.