Final TMDLs Approved by EPA: Magothy River

The Magothy River is a 6-mile-long tidal tributary of the Chesapeake Bay in Anne Arundel County, Maryland. From its headwaters in northeast Anne Arundel County, in the vicinity of Pasadena, the river enters the Chesapeake Bay south of Gibson Island. The drainage area of the Magothy River is approximately 92.7 square kilometers (22,901 acres).

Maryland water quality regulations specify that all surface waters of the State shall be protected for water contact recreation, fishing, and protection of aquatic life and wildlife. The designated use of the waters of the Magothy River (8-digit Basin Code: 02131001) 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 Magothy River (Integrated Report Assessment Unit ID: MD-MAGMH) on the State's 2012 Integrated Report as impaired by nutrients (nitrogen & phosphorus) (1996), fecal coliform (1996), impacts to biological communities (2004), polychlorinated biphenyls (PCBs) in fish tissue (2006), and fecal coliform (Deep Creek Tributary) (2012). 

A fecal coliform TMDL for the Magothy River was approved by EPA on February 20, 2006. The Chesapeake Bay TMDL, which was approved by the EPA on December 29, 2010, addressed the sediment and nutrient listings for the Magothy River. The listing for impacts to biological communities and fecal coliform (Deep Creek Tributary) will be addressed at a future date.

The document, available below, establishes a total PCB (tPCB) TMDL for the tidal waters of the Magothy River, for which a data solicitation was conducted, and all readily available data from the past 5 years have been considered.

Total Maximum Daily Loads of Polychlorinated Biphenyls in in the Magothy River Mesohaline Chesapeake Bay Tidal Segment in Anne Arundel County, Maryland

(Approved on March 16, 2015)

EPA's Decision Letter

EPA's Decision Letter

Main Report

Magothy_River_PCB_TMDL_fa.pdf (3,130KB)

Comment Response Document

Magothy_River_PCB_TMDL_CRD_fa.pdf (7KB)

Contact Information

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