Section 303(d) of the federal Clean Water Act (CWA) and the U.S. Environmental Protection Agencys (EPA) implementing regulations direct each state to identify and list waters, known as water quality limited segments (WQLSs), in which current required controls of a specified substance are inadequate to achieve water quality standards. For each WQLS, the State is to either establish a Total Maximum Daily Load (TMDL) of the specified substance that the waterbody can receive without violating water quality standards, or demonstrate that water quality standards are being met. The Jones Falls (basin code 02-13-09-04), located in Baltimore County and Baltimore City, MD, was identified on the States list of WQLSs as impaired by chlordane (1996 listing), copper (Cu) (1996 listing), lead (Pb) (1996 listing), zinc (Zn) (1996 listing), nutrients (1996 listing) suspended sediments (1996 listing), fecal coliform (2002 listing), polychlorinated biphenyls (PCBs) in fish tissue (2002 listing) and evidence of biological impacts (2002 listing). The PCB listing is designated for the Lake Roland impoundment while the remaining listings apply to the non-tidal streams. This report provides an analysis of recent heavy metals monitoring data, including hardness data.