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's guidelines and review them every five years. Additionally, the bill allows the department to grant extensions for the preparation and adoption of these plans if good cause is shown.

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 municipalities that may lack the infrastructure to engage in such planning. The act is set to take effect 60 days after its passage.