Final TMDLs Approved by EPA: Liberty Reservoir

​The Liberty Reservoir watershed is located within the Patapsco River sub-basin of the Chesapeake Bay watershed, within Maryland.  The reservoir’s watershed drains 104,800 acres of western Baltimore County and eastern Carroll County (majority of watershed is located in Carroll County).  A dam was constructed on the North Branch Patapsco River in 1953, creating the Liberty Reservoir, which is owned by the Baltimore City Department of Public Works (BCDPW).  Water supply intakes in the reservoir feed the BCDPW’s Ashburton Water Filtration Plant, which provides drinking water to Baltimore City, Carroll County, and Baltimore County.  The reservoir is primarily fed by the North Branch Patapsco River; other tributaries include Beaver Run, Key​er's Run, Prugh Run, Morgan Run, Middle Run, Locust Run, and Cooks Branch. 

The Maryland Surface Water Use Designation in the Code of Maryland Regulations for Liberty Reservoir is Use I-P (Water Contact Recreation, Protection of Aquatic Life, and Public Water Supply).  The Maryland Department of the Environment (MDE) has identified Liberty Reservoir on the State’s 2010 Integrated Report as impaired by sediments - sedimentation/siltation (1996), nutrients - phosphorus (1996), mercury in fish tissue (2002), and metals – chromium and lead (1996).  The non-tidal portion of the Liberty Reservoir watershed has been identified by MDE on the State’s 2010 Integrated Report as impaired by bacteria – fecal coliform (mainstem only; 2002) and impacts to biological communities (2004).
The TMDL established below by MDE will address the 1996 nutrient and sediment listings for Liberty Reservoir, for which a data solicitation was conducted, and all readily available data from the past five years have been considered.  A water quality analysis (WQA) for chromium and lead in Liberty Reservoir was approved by the EPA in 2003, and a fecal coliform TMDL for the nontidal portion of the watershed was approved by the EPA in 2009.  A TMDL for mercury in fish tissue is currently under development and is scheduled for submittal to EPA in 2012. In the 2012 Integrated Report, the listing for impacts to biological communities includes the results of a stressor identification analysis.

Revised Final Document for Public Comment

On May 7, 2014, the U.S. Environmental Protection Agency (EPA) approved the "Total Maximum Daily Loads (TMDLs) of Phosphorus and Sediments for Liberty Reservoir, Baltimore and Carroll Counties, Maryland," developed by the Maryland Department of the Environment. 
BTR Hampstead, LLC, 102 W. Pennsylvania Ave., Suite 302, Towson, MD 21204 and Carroll County Bureau of Utilities, 225 North Center Street, Westminster MD 21157 jointly submitted an application to be co-permittees for renewal of a permit to discharge an average of 217,000 gallons per day (gpd) of treated sanitary wastewater, noncontact cooling water, wastewater from remediation of contaminated groundwater, and variable amounts of stormwater from an industrial park, located at 626 Hanover Pike, Hampstead, MD to Deep Run (a Use I-P tributary to North Branch Patapsco River) though Outfall 001. 
The permit application also proposes that the BTR Hampstead, LLC sanitary wastewater will be redirected for treatment to the Hampstead Wastewater Treatment Plant (WWTP) located at 4455 North Woods Trail, Hampstead MD 21074 (16-DP-0594, MD0022446) through an existing pumping station located at the adjacent Jos. A. Bank facility. Additionally, a new pumping station and force main will be installed to redirect up to 600,000 gpd of the Hampstead WWTP treated wastewater, after being upgraded to Enhanced Nutrient Reduction Technology, to the existing BTR Hampstead, LLC Outfall 001. After redirection of both these waste streams, a total combined flow of 817,000 gpd will be discharged to the unnamed tributary to Deep Run through Outfall 001.

As a result of this permit request, the text of the point source technical memorandum has been modified to include the updated permit information.  No numeric changes have occurred to the allocations or the overall total TMDL.  These documents along with the permit were available for public comment.  The public comment period was held from March 9 to June 16, 2017.  No comments were received related to the TMDL documents.  The USEPA accepted the revisions on November 13, 2017.

Total Maximum Daily Loads of Phosphorus and Sediments for Liberty Reservoir,
Baltimore and Carroll Counties, Maryland 
(Approved on May 7, 2014)

Portable Document Format

​EPA Acceptance of Revisions Letter EPA's_Acceptance_Letter.pdf (362 KB)
Revised Point Source Technical Memorandum Liberty_Nuts_sed_TMDL_PS_TechMemo_Revised_Final.pdf (70 KB)
EPA Decision Letter EPA's_Decision_Letter.pdf (1,096 KB)
Main Report and Appendices Liberty_Nuts_Sed_TMDL_final.pdf (2,080 KB)
Point Source Technical Memorandum Liberty_Nuts_Sed_TMDL_PS_TechMemo_final.pdf (69 KB)
Nonpoint Source Technical Memorandum Liberty_Nuts_Sed_TMDL_NPS_TechMemo_final.pdf (33 KB)
Comment Response Document Liberty_Nuts_sed_TMDL_CRD.pdf​ (140 KB)

Additional Supporting Information:


Main Report LIBModelReport-9-28-12_Final (2,760 KB)
Appendix A Liberty_Model Appendix_A_06-26-12 (1,479 KB)
Appendix B Liberty_Model_report AppendixB_09-21-12 (731 KB)
Appendix C Liberty_Model_Appendix_C-06-26-12 (29 KB)
Appendix D Liberty_Model_AppendixD_9-21-12 (208 KB)

Appendix E

Liberty_Model_Appendix_E-9-21-12​ (133 KB)


Contact Information 

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