Authorities say more than 100 people are confirmed to have died in Ishikawa Prefecture as of Saturday. Over 200 are still unaccounted for.
At least 10 people are believed to be trapped under collapsed houses in part of the quake-hit town of Anamizu after the quake triggered landslides. Police and firefighters are continuing with their rescue operations.
Authorities are warning that the weekend's bad weather will only worsen the danger. Rain is forecast through Sunday across the Hokuriku region and Niigata Prefecture.
The ground has been loosened, and even a small amount of rain could trigger more landslides.
72,000 households without water, 23,900 without power
Japan's health ministry says more than 72,000 households were without water as of 7 a.m. on Saturday in the three prefectures most affected by Monday's massive earthquake.
The three prefectures are Ishikawa, Toyama and Niigata, along the Sea of Japan coast in central Japan.
In Ishikawa, the worst-hit prefecture, disrupted water supplies are affecting 66,400 households in seven cities and seven towns. About 5,640 households in two cities in Toyama and about 150 households in two cities in Niigata are also affected.
The country's industry ministry says the earthquake damaged equipment used to distribute electricity, leaving about 23,000 households in Ishikawa without power as of 2:00 p.m. on Saturday.