Water Resources Program  |  TMDLs

TMDL Requirements
Moorman's RiverIt is likely that most of the streams and lakes within Albemarle County would be deemed "impaired" by the Virginia Department of Environmental Quality (DEQ), if enough information was collected to make a determination. DEQ is required to prepare plans to restore all impaired waters through a process commonly referred to as a TMDL. This acronym strictly stands for "Total Maximum Daily Load", which is the maximum pollution amount a waterbody can assimilate over a given time period while still remaining healthy.

Click here to view a detailed map of DEQ-designated impaired water within Albemarle County.

The term TMDL is more often used to describe the entire analysis and planning process for assessing and restoring a waterbody. The process includes identifying impaired waters as described above, determining the pollution limits for these waters, and developing an implementation plan to reduce pollution loads to the determined limits. Therefore, the term Chesapeake Bay TMDL is typically meant to refer to the restoration process and not merely the determined pollutant load limits.

DEQ has required localities to develop, by July 1, 2015, a detailed action plan to achieve pollutant load reductions allocated to urban areas throughout the state as part of the Chesapeake Bay TMDL process. In addition, by July 1, 2016 the County must develop action plans for any local TMDLs that have associated load reduction allocations; these presently include an e. Coli reduction for the Rivanna River and some of its tributaries and a sediment reduction for the Rivanna River.

Chesapeake Bay TMDL Action Plan
The County has prepared a Chesapeake Bay TMDL Action Plan that was submitted to DEQ on October 1, 2015 as part of the County's
MS4 Annual ReportThe County sought public comments on this draft during the month of August 2015 and incorporated comments received into the report. Additionally, the County has prepared a Local TMDL Action Plan, see link below, to address the special conditions for an approved TMDL other than the Chesapeake Bay TMDL.

Various elements of the Action Plan are available below.

Chesapeake Bay TMDL Action Plan

 - document summarizing the requirements, computations, and results

Local TMDL Action Plan

 - document summarizing the local requirements, computations, and results

Map 1: MS4 Regulated Area

- map depicting extent of the County's regulated area and contrasting with the County's designated urban areas

Map 2: Existing and New Sources for Chesapeake Bay TMDL Action Plan
(large file: 7.3MB)

 - map depicting 2009 land cover and locations of subsequent land development that must be considered as part of pollutant reduction accounting

Nutrient Load Accounting for Chesapeake Bay TMDL Action Plan  - spreadsheet containing all computations

 Staff contact: Stavros Calos