Total Maximum Daily Load (TMDL) Action Plans

A Total Maximum Daily Load (TMDL) is the calculated maximum amount of a particular pollutant a waterbody can receive without exceeding water quality standards. Implementation of TMDLs are a requirement of section 303(d) of the Clean Water Act. The Commonwealth of Virginia is required to establish TMDLs for waterbodies that are declared impaired for certain pollutants. Localities receive allocations for those pollutants under a TMDL and are required to create an action plan for each TMDL. The TMDL action plan is a document that outlines management and restoration initiatives aimed to reduce the amount of a particular pollutant for a designated body of water.

Municipal Separate Storm Sewer System (MS4) Permit

Chesterfield County’s Municipal Separate Storm Sewer System (MS4) Permit Number VA0088609 (PDF) was reissued to the county on Dec. 17, 2014. The purpose of the permit is to authorize the discharge of stormwater from the MS4 and require the implementation of programs which manage stormwater and reduce the discharge of pollutants to surface waters.

Action Plans

Bacteria TMDL Action Plan

Action Plan Development

A component of the county’s permit, TMDL action plans, requires the development of programs to reduce specific pollutants in the county’s waterways. The Bacteria TMDL Action Plan (PDF) provides a framework for Chesterfield County’s efforts to reduce discharges of bacteria from MS4 sources.


Chesterfield County encourages residents to review the Plan and offer comments. When submitting comments, please indicate in the subject line “Bacteria TMDL Action Plan” and include your name and any organizational affiliation name.

Comments can be emailed to the stormwater manager or submitted by mail:

Chesterfield County Environmental Engineering
P.O. Box 40
9800 Government Center Parkway
Chesterfield, VA 23832