TMDL Information for Coastal Waccamaw

What is a TMDL?  A total maximum daily load is the amount of a pollutant (such as phosphorus) that can enter a waterbody on a daily basis, still allowing for the waterbody to meet state water quality standards. Every two years, SC DHEC must submit a list of monitored waterbodies that do not meet water quality standards for one or more parameter (the "303d list").  From that list, it is determined what pollutants and impairments can be fixed through the TMDL process or other means. Therefore, "TMDL" may refer to the calculation of a pollutant entering a waterbody as well as a document which outllines potential sources of that pollutant within a watersed, information on the calculation, and relevant information including maps, figures and pictures.

For more information on DHEC's website regarding the 303d list and TMDLs, click here.

The TMDL process is a regulatory process, and therefore, there are many ways in which a TMDL can play a role in local government decision-making. For our regional education effort, the TMDL process is an important consideration as the consortium decides what priority pollutants should be addressed through education and public involvement.

The following map shows the TMDL watersheds that have been approved and affect the Coastal Waccamaw region. Utilize the station identification numbers to locate the corresponding Approved TMDL document in the Approved TMDL List developed by DHEC.



Click here to download the map (produced in Feb. 2010 with available data)




Click here to download the map (produced in Feb. 2010 with available data)



To see what TMDLs are currently being developed by DHEC, visit the Commencement of TMDLs website.

2010 is the most recently developed 303(d) list for the state of South Carolina. Stations and their impairments can be viewed by county by clicking here (pdf, 66KB).