Synopsis As Introduced Amends the Counties Code. Changes the application of provisions concerning allowing management and mitigation of the effects of urbanization on stormwater drainage in metropolitan counties located in the area served by the Northeastern Illinois Planning Commission to those located in the area served by the Chicago Metropolitan Agency for Planning. Authorizes all counties (currently, only specified counties) to adopt stormwater management plans. Provides that counties' minimum standards for floodplain and stormwater management should have an emphasis on the use of cost effective, nature-based solutions and provides examples of such solutions. Provides that the stormwater management plans shall evaluate water quality and flooding problems caused by urban flooding. Defines "urban flooding" as the flooding of public and private land in urban areas that results from stormwater or snowmelt runoff overwhelming the existing drainage infrastructure, unrelated to the overflow of any river or lake, whether or not that land is located in or near a floodplain. Provides that a stormwater management planning committee may make grants to units of local government and landowners under specified conditions.