Final TMDLs Approved by EPA: Corsica River

The Corsica River watershed is located within Queen Anne’s County. It drains to the Chester River, which eventually drains to the Chesapeake Bay. The tidal portion of the watershed extends from its confluence with the Chester River to the Town of Centreville. The tidal range is 1.6 feet (0.488 meters (m)) based on the United States National Oceanic and Atmospheric Administration tidal station in Centreville Landing, MD. The depths of the river range from about 1-2 feet (0.3-0.6 m) at the headwaters of the tidal embayment to greater than 15 feet (4.6 m) prior to its confluence with the Chester River.

The Maryland water quality regulations state that all surface waters of Maryland shall be protected for water contact recreation, fishing, and protection of aquatic life and wildlife. The specific designated use of Corsica River of the Lower Chester River Mesohaline segment (also referred to as the Corsica River embayment ) is Use II – Support of Estuarine and Marine Aquatic Life and Shellfish Harvesting. The Maryland Department of the Environment (MDE) has identified the waters of the Corsica River of the Lower Chester River Mesohaline segment on the State’s Integrated Report as impaired by the following pollutants (listing year and Integrated Report Assessment Unit Identification in parentheses): sediments – later changed to a total suspended solids (TSS) listing (1996; MD-CHSMH), nutrients (1996; MD-CHSMH), fecal coliform (1996; MD-CHSMH-Corsica_River), polychlorinated biphenyls (PCBs) in fish tissue (2002; MD-CHSMH-02130507), and impacts to biological communities (2004; MD-CHSMH).

Nitrogen and phosphorus TMDLs and a fecal coliform TMDL for the restricted shellfish harvesting portion of the Corsica River were approved by the US EPA in 2000 and 2005, respectively. The sediments listing will be addressed via the Chesapeake Bay TMDL scheduled to be established by the end of 2010. The document, available below, establishes a total PCB (tPCB) TMDL for the Corsica River of the Lower Chester River Mesohaline segment (MD-CHSMH-02130507). Data solicitation for PCB related information was conducted by MDE, and all readily available data have been considered.


Total Maximum Daily Loads of Polychlorinated Biphenyls in Corsica River of the Lower Chester River, Mesohaline Segment, Queen Anne’s County, Maryland

(Approved on March 22, 2011)

EPA's Decision Letter EPA's Decision Letter
(Does not include MDE's requested revisions)
MDE's Edits to EPA's Decision Letter MDE's Decision Letter Edits (35KB)
Main Report

TMDL_Corsica_River_PCBs.pdf (1006KB)

Comment Response Document

CRD_Corsica_River_PCBs.pdf (7KB)


Contact Information

Please direct questions or comments concerning this project to Maryland's TMDL Program at (410) 537-3818.