Water Quality Analyses (WQA) with EPA Concurrence of MDE's Findings: Bynum Run

The Bynum Run watershed is located in the center of Harford County. The watershed drains into Bush River. The main transportation corridors in the watershed are Maryland-Route 24, which runs the length of the watershed, and Interstate-95 in the southern portion.  The drainage area of Bynum Run watershed is 14,358 acres.  

Bynum Run (basin code 02130704), located in Harford County, Maryland, was identified on the State’s list of WQLSs as impaired by sediments (1996 listing), nutrients (1996 listing), and impacts to biological communities (2002 listing).   The document available below, upon EPA approval, addresses the nutrient impairment in Bynum Run; the sediment and biological impairments will be addressed at a future date.

An analysis of recent monitoring data shows that the dissolved oxygen criterion and designated uses associated with nutrients are being met in Bynum Run.  The analysis supports the conclusion that a TMDL for nutrients is not necessary to achieve water quality in this case. 
Barring the receipt of contradictory data, this report will be used to support the nutrients listing change for the Bynum Run from Category 5 (“waterbodies impaired by one or more pollutants requiring a TMDL”) to Category 2 (“Surface waters that are meeting some standards and have insufficient information to determine attainment of other standards”), when the Maryland Department of the Environment (MDE) proposes the revision of Maryland’s 303(d) list for public review in the future. 

Although the waters of Bynum Run do not display signs of eutrophication, the State reserves the right to require future controls in the Bynum Run watershed if evidence suggests nutrients from the basin are contributing to downstream water quality problems.  

Water Quality Analysis of Eutrophication for Bynum Run, Harford County, Maryland

(Concurrence June 12, 2007)

EPA's Decision Letter EPA's Decision Letter

Main Report 

WQA_BynumRun_eutro.pdf (521KB)

Comment Response Document

CRD_BynumRun_eutro.pdf (14KB)

Contact Information

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