Total Maximum Daily Load (TMDL)

Total Maximum Daily Load (TMDL)

Virginia’s goal is that all is that rivers, lakes, streams and tidal waters are healthy and attain the appropriate beneficial uses. These beneficial uses are described by the following use goals: drinking water, primary contact/swimming, fishing, shellfishing and aquatic life. These uses are protected by application of the state’s numeric and narrative water quality criteria. When the beneficial uses are not being met these waters are considered “impaired” and the state must take steps to meet water quality standards and ensure that water quality is restored.


One very important step in restoring water quality in the impaired water bodies is the development and implementation of Total Maximum Daily Loads, or TMDLs. A TMDL identifies the amount of any pollutant that can be assimilated by a particular stream and that stream still meet the water quality standard for that pollutant. It also identifies all the known sources of that pollutant and quantifies each source. 

The District currently offers cost share for residential septic pump outs and repairs in the following TMDL watershed:​

  • Slate River & Rock Island Creek

Slate River & Rock Island Creek Watershed


If you are unsure of which watershed you are located in or have questions regarding your location, please contact our office at (434) 983-7923.