Quite extensive, in fact:
One example: On January 16, 2016, President Obama issued an emergency declaration for the State of Michigan and ordered Federal aid to supplement state and local response efforts due to the emergency conditions in Flint, Michigan, affected by contaminated water. The President's action authorized the Federal Emergency Management Agency (FEMA) to provide water, water filters, water filter cartridges, water test kits, and other necessary related items; assistance with those commodities has been extended through August 14, 2016.
Read more: FACT SHEET: Federal Support for the Flint Water Crisis Response and Recovery
In addition, he brokered a $100 million grant: $100 million to address the lead in the drinking water crisis in Flint, Michigan, despite a report that seeks to give Trump credit for the funding.
$100 million to the state of Michigan to fund drinking water infrastructure upgrades in Flint. The EPA said in its announcement that the funding was provided by the Water Infrastructure Improvements for the Nation Act of 2016, a measure passed by Congress and signed into law by Obama in December.