Streamlining Environmental Approvals Act of 2019 or the SEA Act of 2019 This bill lessens restrictions on taking and importing marine mammals and marine mammal products and also decreases the requirements for obtaining an authorization for incidentally taking marine mammals by harassment. Harassment is an act of pursuit, torment, or annoyance which has the potential to either (1) injure a marine mammal in the wild; or (2) disturb a marine mammal by causing disruption of behavioral patterns, such as migration or breeding.