Central Nozawa Onsen, Nozawaonsen Village, Nagano Prefecture
Oyu Public Bath
The village's best-known wooden bathhouse, with separate hot and cooler pools fed by the Oyu source. The baths are simple and volunteer-maintained, with no showers or hair dryers.
Check before bathing
- Opening hours
- 05:00–23:00 from April through November; 06:00–23:00 from December through March. There is no fixed admission charge; visitors are asked for a voluntary contribution.
- Tattoo policy
- The current tourism-association pages reviewed do not confirm a tattoo rule; check locally if you need a definite answer.
Spring & water temperature
- Spring-source temperature
- 66°C; the official description also notes weak alkalinity.
- Bathing temperature
- Not published as a fixed figure; the bath has hot and cooler pools.
- Spring source
- Oyu source.
- Spring classification
- Simple sulfur spring.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- Nozawa Onsen's tourism association describes all 13 public baths as 100% source-flowing. The two pools are identified as hot and cooler, but fixed temperatures and pool-specific flow details are not published.
Bathing indications
The association lists general bathing indications including neuralgia, rheumatism, reduced gastrointestinal function, diabetes and dermatitis. These are general references, not medical advice or a treatment promise.
The 66°C figure is the source temperature, not the pool temperature. Bring your own toiletries; there are no showers or hair dryers.
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.
