After dumping the fuel tanks into the lake of Ogawara, the jet returned to the base, the Kyodo news agency reported, providing no information on possible victims.
Fishermen said the tanks fell 400 meters (0.2 miles) from one of the fishing vessels on the lake, according to the agency.
The Misawa air base is located on the Japanese Honshu Island and hosts both US and Japanese troops. Misawa is also reportedly one of a few foreign airfields where the Americans station their advanced fifth-generation F-22 Raptor fighters on a rotational basis
Previous year, Pentagon started to relocate its fifth-generation F-35 fighters to the Iwakuni military base in southwestern Japanese prefecture of Yamaguchi. Washington planned to deploy sixteen F-35 jets in Japan, replacing F/A-18 and AV-8 Harrier aircraft.