Secton 303(d)
Section 303(d) of the Clean Water Act
requires each state develop a list of waterbodies that need additional work beyond existing controls to achieve or maintain water quality standards, and submit an updated list to the Environmental Protection Agency (EPA) every two years. The additional work necessary includes the establishment of Total Maximum Daily Loads (TMDLs). The TMDL process provides analytical framework to identify the relative contributions of each pollutant. The TMDL identifies the sources and causes of pollution, e.g., point sources, non-point sources, or a combination of both, and establishes allocations for each source of pollution as needed to attain water quality standards.
The Section 303(d) List provides a comprehensive inventory of water bodies impaired by all sources. This inventory is the basis for targeting water bodies for watershed-based solutions, and the TMDL process provides an organized framework to develop these solutions.
 Map of the 1998 303(d) Listed Waters
Nevada's 1998 303(d) List
Nevada's 2002 303(d) List
EPA's partial approval and disapproval of 2002 303(d)List
EPA's Final Amendments to 2002 203(d) List
EPA APPROVED FINAL Nevada's
2004 303(d) Impaired Waters List – November 2005
EPA APPROVED FINAL Nevada's 2004 303(d) Impaired Waters List – November 2005 –
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