Where Does the Water of Dogo Onsen Come From? — 19 Hot Spring Sources and Four Water Distribution Stations

In Dogo Onsen, 29 hot spring sources have been developed, and 19 are registered in Ehime Prefecture. This article introduces the four water distribution stations that blend source waters to adjust the water temperature, and the 4th Water Distribution Station where you can view the piping and hand bath. It also outlines its location from the station and the contents of the viewing room.

29 Wells Dug, 19 Active

At Dogo Onsen, 29 hot spring sources have been developed to date. Among them, 19 are currently registered with Ehime Prefecture as hot springs. The sources are numbered from No. 1 to No. 29, and each varies in temperature and discharge volume. Lower-temperature sources are around 20 degrees Celsius, while higher-temperature ones reach around 55 degrees Celsius, creating a range of more than 30 degrees Celsius. While Source No. 1 is no longer pumped today, the site of its well is still displayed in the Kami-no-Yu male bathhouse of Dogo Onsen Honkan.

The Choice to Neither Heat Nor Dilute with Water

Hot spring waters with varying temperatures cannot be sent directly to the bathtubs as they are. Therefore, in Dogo, pumped spring water is first gathered in facilities called "distribution facilities" (bunyujo). There are four distribution facilities. Here, high-temperature and low-temperature spring waters are blended and adjusted to a constant temperature before being distributed to the public bathhouses (soto-yu) and individual ryokan inns.

What is noteworthy is that neither heating nor adding water is used for this temperature adjustment. The water temperature is adjusted solely by blending sources of different temperatures together—a method made possible precisely because of the number of sources and the broad temperature range spanning from 20 to 55 degrees Celsius.

The 4th Hot Spring Distribution Facility: A Site Where You Can See Water Gathering

Among the four distribution facilities, the 4th Hot Spring Distribution Facility is the only one where visitors can observe the process of spring water being gathered. Located at 7-28 Dogoyuno-machi, Matsuyama City, a 1-minute walk west from Dogo Onsen Station, its observation room is open to the public free of charge from 9:00 a.m. to 8:00 p.m. It is open year-round, but may close temporarily for major cleaning or other reasons.

Here, water is gathered from six sources in total: four located on the facility grounds and two slightly farther away. The gathered water is distributed to the indoor baths of various ryokan inns, as well as to Dogo Onsen Honkan, Tsubaki no Yu, and Asuka-no-Yu. Because it is located a 1-minute walk west from Dogo Onsen Station, it can be visited as if tracing the flow of hot water from in front of the station.

Pipes, Thermometers, and Storage Tanks

Upon entering the observation room, you will see hot spring water flowing vigorously from five pipes directly in front. All of it is hot spring water pumped from the source wells. Because the pumped volume is adjusted depending on the season, weather, and the number of bathers, some pipes may not be discharging water. Inside the room, thermometers allow visitors to check the temperature of each individual source. Visitors can also observe multiple sources flowing down into the storage tank.

The hand bath (teyu) located on the front-right side of the building is supplied directly from the storage tank gathering hot springs at the 4th Hot Spring Distribution Facility. All the hot spring waters gathered here are around 50 degrees Celsius, and because the hand bath does not undergo temperature adjustment, it is also around 50 degrees Celsius. It is a place where you can feel the warmth of hot water with your hands.

Visiting the Facility on Foot

The building is a single-story reinforced concrete structure with a site area of 115.35 square meters and a building footprint of 39.2 square meters. There is no parking lot on the premises. Care should be taken when walking from Dogo Onsen Station, as the road is used by large buses.

Collecting, Mixing, and Distributing

Rather than each facility having its own separate hot spring source, Dogo's water is collected, mixed, and distributed. The spring quality is an alkaline simple hot spring. Whether visiting a public bathhouse or staying at a ryokan inn, you soak in water that has passed through the exact same system. For those wishing to view Dogo's hot springs from an angle distinct from architecture or history, this distribution system serves as an entry point. Visiting the 4th Hot Spring Distribution Facility before taking a bath and feeling the water running through the pipes and the heat of the hand bath may slightly change how you experience your bath afterward.

Visiting the 4th Hot Spring Distribution Facility before heading to a public bath allows you to understand how the waters of Dogo Onsen reach each facility in the sequence of source, piping, storage tank, and distribution destination. While the observation room is open free of charge, the volume of spring water pumped is adjusted according to the season, weather, and number of bathers, so the conditions of the pipes vary from time to time.

*Note: The number of hot spring sources, temperatures, and observation hours are subject to change. Please verify official information before visiting.