Oga Onsenkyo, Oga, Akita Prefecture
Seiko Grand Hotel
Not an option for general day visitors: the hotel currently restricts bathing to overnight guests and their designated guest privileges. Older directory listings for a ¥800 day ticket are out of date.
Check before bathing
- Opening hours
- General day-use bathing is not currently accepted. Overnight guests' bath hours are 15:00–24:00 and 05:00–09:00. A sister-hotel bathing benefit for Seiko Grand guests is seasonal, roughly mid-April to mid-November, and is not a general day ticket.
Spring & water temperature
- Spring-source temperature
- 55.4°C; this is the source temperature.
- Bathing temperature
- Not published.
- Spring source
- Oga Onsen No. 1.
- Spring classification
- Sodium chloride spring.
- pH
- 7.4.
- Flow rate
- Not published.
- Water handling
- The hotel describes the spring as source-flowing, with minimal seasonal water addition and heating, no circulation, no bath additives and chlorine-based sanitation. This describes the hotel's bathing facilities, not general day-use access.
Bathing indications
The hotel lists general bathing indications for its spring, but this does not change the current restriction on general day-use bathing.
As of 7 September 2026, general outside visitors were not accepted for day use. Older ¥800 listings do not supersede the hotel's current notice.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
