Tokumitsu, Hakusan, Ishikawa Prefecture
Mattō Kaihin Onsen Otsukarisama
One of Hakusan's strongest road-trip stops if you want an early soak, open-air bath, sauna or sunset over the Sea of Japan near the Hokuriku Expressway. Choose a mountain municipal bath if your priority is the lowest admission or a quieter setting.
Check before bathing
- Opening hours
- Tuesday–Sunday 05:00–22:30; Mondays 10:00–22:30. Last admission 22:00. Closed on the third Thursday of each month.
- Tattoo policy
- The current first-party information reviewed does not confirm a tattoo policy. Check with the facility before visiting.
Spring & water temperature
- Spring-source temperature
- Not published. The current 2026 official pages classify it as a hot spring but give no exact source temperature.
- Bathing temperature
- Not published as a fixed value.
- Spring source
- Mattō Kaihin Onsen; the current official pages do not publish an individual source well that can be matched to 2026.
- Spring classification
- Sodium chloride spring; isotonic, mildly alkaline and hot.
- pH
- Not published in current official pages.
- Flow rate
- Not published in current official pages.
- Water handling
- Hakusan City, the Hakusan Tourism League and the operator confirm a natural chloride spring. Facilities include a large bath, open-air bath, sauna, shallow pool and reclining bath. Current 2026 pages do not give complete treatment details for water addition, heating, circulation filtration, disinfection or overflow for each pool, so the baths are not described as entirely source-flowing.
Bathing indications
Hakusan City's current page lists general bathing indications including neuralgia, muscle and joint pain, frozen shoulder, bruises, sprains, chronic digestive conditions, haemorrhoids, sensitivity to cold, fatigue, cuts, burns, chronic skin conditions and chronic gynecological conditions. These are not treatment guarantees.
Current main pages do not provide complete pool-by-pool information on water addition, heating, circulation, disinfection or overflow.
Admission in 2026 is ¥530 for adults, ¥150 for elementary-school children and ¥100 for children aged 3 and older. The operator confirmed reopening on 23 April 2026 and continues to update its event calendar.
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.
