Section 303(d) of the federal Clean Water Act (CWA) directs states to identify and list waters, known as water quality limited segments (WQLSs), where current, required controls of a specified substance are inadequate to achieve water quality standards. For each WQLS, the State is to establish a Total Maximum Daily Load (TMDL) of the specified substance that the waterbody can receive without violating water quality standards. On the basis of fish tissue data associated with portions of the Baltimore Harbor, the entire waterbody was identified on the 1998 additions to Maryland's 303(d) list of WQLSs as being impaired by the pesticide chlordane. This report documents the establishment of a proposed chlordane TMDL for Baltimore Harbor. Once approved by the U.S. Environmental Protection Agency (USEPA), the TMDL will be documented according to procedures described in the States Continuing Planning Process. In the future, the established TMDL will support monitoring activities required to track restoration of the impaired resource with the eventual goal of lifting the associated fish consumption advisory.