The release of the treated water was decided on by the Suga administration in April 2021.
"We made the decision with the determination that we cannot push back (the release of) the treated water," Suga told reporters during the visit.
"There is no end to efforts to ensure safety," he said, adding that the water release "should be done with a sense of tension."
During the visit, Suga watched reactor decommissioning work from a deck overlooking a reactor building and was briefed on the water release process by Tepco officials at a facility for diluting the treated water before releasing it into the sea.
Through the inspection, Suga may have partly intended to demonstrate his presence ahead of three by-elections for the House of Representatives later this month, observers said.
Suga told reporters that it was "very regrettable" that the LDP has managed to endorse a candidate in only one of the three races.
Regarding possible revisions to the political funds control law following a high-profile money scandal involving LDP factions, Suga said that the party should lead work to draw up revisions that are highly transparent and convincing to the people.
According to sources, Suga has said that Prime Minister Fumio Kishida cannot dissolve the Lower House amid falling public support for his Cabinet.
Suga — a key figure among nonmainstream members of the LDP — and his actions could be closely watched as the results of the by-elections may trigger moves to replace Kishida as president of the LDP, observers said.
