According to Ministry of the Environment statistics, Tokyo (Kanto) has 22 onsen areas and 168 hot-spring sources. This page lists 14 onsen in Tokyo with their water types. The most common water type among them is Chloride Spring (4 onsen).
Source: Ministry of the Environment, FY2024 Hot Spring Utilization Survey (as of March 31, 2025). Best-known onsen = most annual Wikipedia views.
| Water Type | Count | Share |
|---|---|---|
| Chloride Spring | 4 | 29% |
| Simple Thermal Spring | 3 | 21% |
| Sulfur Spring | 2 | 14% |
| Unknown | 2 | 14% |
| Bicarbonate Spring | 1 | 7% |
| Iron Spring | 1 | 7% |
| Radium Spring | 1 | 7% |
| Facility | Water Type |
|---|---|
| Hanakei no Yu | Unknown |
| Kur Garden (Tama Tech) | Unknown |
| Spa LaQua | Unknown |
| LaQua | Unknown |
| Toshimaen Niwa no Yu | Chloride Spring Sodium – strong chloride spring |
| Thermae-yu | Unknown |
| Keio Takaosan Onsen | Simple Thermal Spring Alkaline simple spring |
| Kabe Onsen | Unknown |
| Akigawa Valley Seotonoyu | Unknown |
| Spagium Japon | Chloride Spring Sodium – chloride/bicarbonate spring |
| Murayama Onsen Katakuri no Yu | Unknown |
| Okutama Onsen Moegi no Yu A day-use hot spring facility near Lake Okutama, a rarity within central Tokyo. | Simple Thermal Spring Alkaline simple spring |