Water quality regulation is currently evolving as new regulatory programs for both point and nonpoint source water quality and the management tools necessary to address those programs are developed. The Chesapeake Bay Tributary Strategy, preparation of total maximum daily loads (TMDLs), nonpoint source best management practices (BMPs) and related issues are all still evolving. Maryland's population growth over the next 25 years provides a challenging environment in which to integrate water quality planning with local comprehensive plans. As with water supply, the quality of the data will continue to change and improve during the planning period mandated in HB 1141 and the regulatory context will continue to be clarified. Also as with water supply, this guidance document and the WREs that are prepared by local governments will have to be updated in the future to reflect changes in water quality programs and regulations.​