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Explore, Discover and Learn about your water.
States and Tribes Play a Primary Role in Protecting Water Quality
States have primary responsibility to implement the Clean Water Act to protect waters in their state and Native American Tribes and Nations have the opportunity to take on Clean Water Act authority for their tribal lands. This includes setting standards, monitoring and assessing water quality, and developing goals to safeguard and restore those water resources.
The Safe Drinking Water Act (SDWA) requires EPA to establish and enforce standards that public drinking water systems must follow. EPA delegates primary enforcement responsibility (also called primacy) for public water systems to states and Tribes if they meet certain requirements. The information shown on the tribal pages is inclusive of assessments performed against tribal thresholds, tribally adopted water quality standards, and EPA approved water quality standards.