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Watersheds

Understanding Water Quality

Impaired Waters

Algal blooms can lead to biological impairments

Algal blooms can lead to biological impairments

The 303(d) list is the list of waterbodies that do not meet water quality standards and are not covered under an approved TMDL for the pollutant of concern, even after controls for point and nonpoint source pollution have been put in place. A TMDL, or Total Maximum Daily Load, is the amount of a single pollutant (such as bacteria, nutrients, metals) that can enter a waterbody on a daily basis and still meet water quality standards set forth by the State. In accordance with the Clean Water Act, sites covered under an approved TMDL are removed from the 303(d) list for the pollutant of concern.

Agricultural Activities
Failing Septic Systems

Agricultural activities and failing septic systems can contribute to bacteria impairments


Bureau of Water . Phone: (803) 898-4300 . Fax: (803) 898-3795 . Contact Us