An Act updating and expanding the storm water planning requirements to be undertaken by counties; authorizing counties to regulate storm water within a watershed-based planning area; authorizing the formation of water resources management authorities; enabling counties, municipalities and water resources management authorities to develop integrated water resources management plans; imposing duties and conferring powers on the Department of Environmental Protection, the Environmental Quality Board, counties, municipalities and water resources management authorities; providing for financing and for waiver of use for certain grant or loan funds; establishing the Integrated Water Resources Management Account; and making repeals.

HB 659 creates a new statewide framework for managing water resources by requiring counties and municipalities to develop watershed-based storm water and integrated water management plans. It authorizes counties to regulate storm water within specific watersheds, allows for the formation of water resources management authorities, and mandates coordinated planning across local governments. The bill establishes the Integrated Water Resources Management Account to fund these efforts and provides new mechanisms for grants, loans, and fee collection to support implementation. This replaces outdated storm water planning rules with a unified system aimed at addressing flooding, erosion, and water quality issues through coordinated local action.