An EPA rollback of Obama-era water protections could be particularly harmful to places like Harris County, which is still recovering from Hurricane Harvey.
A federal judge issued a nationwide injunction on the Trump administration's order delaying the Clean Water Rule.
The Clean Water Rule, which passed in 2015, was meant to give federal officials more authority over small waterways and wetlands to prevent pollution.
The Trump administration hopes to replace the regulation with a more industry-friendly version.