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Introduction to WQS, continued

As indicated by the placement of WQS in all parts of the water body system illustrated in the figure to the left, water quality standards should be established for all surface waters meeting the definition of “waters of the United States.”

States, territories, and designated tribes, using their own authority, can adopt standards for additional surface waters. Though the CWA does not require WQS for ground water, states, tribes, and territories can use their own authority to set targets for ground water.