This bill amends the Storm Water Management Act of October 4, 1978, specifically focusing on the requirements for counties to prepare and adopt watershed storm water management plans. It mandates that each county must develop these plans within two years of the Department of Environmental Resources issuing guidelines, in consultation with local municipalities, and requires a review and revision of the plans at least every five years. The Department may grant extensions for good cause to counties needing more time to comply.

A significant change introduced by this bill is the exemption for municipalities that do not have a public water or sewer system from participating in the watershed storm water management plan. This insertion aims to alleviate the regulatory burden on smaller or less developed municipalities that may lack the infrastructure to engage in such planning. The act is set to take effect 60 days after its passage.