Seiganji, Nishi Ward, Saitama City, Saitama Prefecture
Saitama Seiganji Onsen
A strong choice if the spring itself matters: the facility offers a raw, unheated source-water bath, a bamboo-grove outdoor setting and modest admission. It is less suitable for tattooed visitors or anyone relying on a late-night visit after 01:00.
Facility photos
Check before bathing
- Opening hours
- 10:00–24:00; last admission 23:30. Adult admission is ¥900 on weekdays and ¥1,000 on weekends and holidays. Towels and facility wear cost extra.
- Access
- About an 18-minute walk from Nishi-Omiya Station. From Omiya West Exit, several Tobu Bus routes stop at Seiganji; the bath is about a one-minute walk from the stop.
- Tattoo policy
- Tattoos of any size and body-paint stickers are not permitted. No cover-seal exception is listed.
Spring & water temperature
- Spring-source temperature
- 38.1°C in the facility's published analysis dated 14 December 2009; the current outdoor-bath page separately describes the raw spring at about 38.3°C.
- Bathing temperature
- The published analysis lists 37.5°C for the raw-spring bath, 43°C for the source hot pool, 40°C for the hinoki bath and 41°C for the rock, sleeping, reclining and pot baths. The current page also describes the raw spring at about 38.3°C; actual temperatures may vary by operation and season.
- Spring source
- Seiganji Onsen, beneath Seiganji 683-4 in Nishi Ward; the outdoor raw-spring bath draws from about 1,500 metres underground.
- Spring classification
- Sodium chloride spring; weakly alkaline.
- pH
- 7.9 in the facility's published analysis.
- Flow rate
- 230 L/min, drilled and mechanically lifted, according to the facility's analysis.
- Water handling
- The facility's analysis page lists the raw-spring bath as unheated, without circulation filtration or chlorine disinfection. The source hot pool, rock bath, sleeping bath, reclining bath and pot baths are heated but not circulation-filtered or chlorine-disinfected. The hinoki bath is heated, circulation-filtered and chlorine-disinfected.
- Analysis date
- 2009
Bathing indications
The facility's listed bathing indications are general hot-spring information, not a treatment guarantee.
Tattoos of any size are prohibited. The 38.1°C source figure comes from a 2009 analysis; it is not a new 2026 test.
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.
