Chateraise Hotel Isawa (Day Use)

Spring source

Isawa Onsen water

Spring classification

Alkaline simple spring

pH

9.1

Water handling

The facility describes a circulation and heating system with added water. The bubbling pool uses plain water, not onsen water.

Public bathing is listed 10:30–21:30, last admission 20:30, at ¥1,000 for adults and ¥700 for children. The one-hour private bath costs ¥3,300 plus admission per guest and must be booked in advance. A day-use closure was scheduled for 2026-09-17; verify the latest operating notice. Tattoos are not permitted.