The bill, passed by both houses of the GOP-controlled Congress, undoes the DOI Office of Surface Mining Reclamation and Enforcement's so-called stream protection rule.
The regulation was filed in the final days of President Barack Obama's presidency.
The Stream Protection Rule drew attacks from the mining industry, which said its true aim was to shut down mines. The coal mining industry said it would be costly to implement and lead to job losses across the sector, which is already suffering from a market-driven downturn in demand for its product.
"Not only did the Department of the Interior and OSMRE fail to consult with stakeholders and consider the economic impacts, including the possible elimination of thousands of jobs, but they also refused to acknowledge that the rule conflicted with EPA authority and was duplicative of existing regulations under laws such as the Clean Water Act", Manchin said. "We're going to fight for you". Republicans voted to overturn the "stream protection rule" earlier this month.
"In eliminating this rule, I am continuing to keep my promise to the American people to get rid of wasteful regulations that do absolutely nothing but slow down the economy, hamstring companies, push jobs to other countries", he said while surrounded by lawmakers and coal miners.
Environmentalists supported the administration rule, saying it would protect waterways from pollution and preserve public health.
The legislation has at least some bipartisan support. Sen.
"If you want to help miners, then come address their health and safety and their pension program", Sen.
The Senate this week sent Trump a CRA resolution blocking a gun sales regulation.
This story was updated at 4:10 p.m.