Iwaki Yumoto Onsen: Day-Use Hot Spring Baths & Prices

In the south of Iwaki City, Iwaki Yumoto Onsen is a historic spring counted among the Three Ancient Springs of Japan, alongside Arima and Dogo. With more than a thousand years since its opening, it is a town that once flourished with the Joban coal mines.

Highlights

The sulphur-scented water is said to keep you warm long after the bath. It is a sulfur-sodium-chloride-sulfate spring with a source temperature of about 58 degrees and an abundant yield of some 5,000 liters per minute. Nearby stands the Spa Resort Hawaiians, and the town is known for the story of the hula girls born from the history of the Joban mines, giving it a lively spirit. There is also a public bathhouse, the Sahako-no-yu.

Enjoying the Seasons

The sea is close and the climate mild all year, with swimming in summer and strolls in spring and autumn. Even winter is pleasant here. As the Hawaiians is mainly an indoor facility, it can be enjoyed year-round regardless of the weather.

Access and Basic Information

About five to ten minutes on foot from Yumoto Station on the JR Joban Line. With good limited-express access from the Ueno direction, and about five minutes from the Iwaki-Yumoto interchange on the Joban Expressway, it is easy to reach by car too. Some facilities accept day-trip bathers, with fees ranging roughly from a few hundred yen to the low thousands.

Practical Travel Notes

The best times are early summer to summer for the sea, and mild spring and autumn for comfortable strolling. The Hawaiians is large enough to fill a full day, so pairing it with a hot spring stay makes for a rich visit. Enjoying the famous water simply at the Sahako-no-yu public bath is also recommended. To avoid crowds, aim for weekdays. Budget from a few hundred yen for a day bath, while overnight stays and leisure facilities vary by plan.

A Quick Tip

Combining the hot spring with seaside leisure makes for a full and satisfying day-long stay. Sulphur water warms the body quickly, so remember to rehydrate after your bath.

Practical Information for Your Visit

The information below centers on Sahako no Yu, the public bathhouse that serves as the gateway to the hot spring town.

• Spring quality: a sulfur-containing sodium chloride and sulfate spring (commonly called a sulfur spring). Although it is a sulfur spring, the rotten-egg smell is not strong. It combines three characters, known as Bijin no Yu (the water of beauty), Shinzo no Yu (the water for the heart) and Netsu no Yu (the water of warmth)
• Spring quality and indications at Sahako no Yu: the hot spring analysis gives a source temperature of 59.7 degrees, colorless and clear water with no taste, a smell of hydrogen sulfide and a pH of 7.6. The indications include chronic skin conditions, burns, cuts, arteriosclerosis, chronic gynecological conditions, diabetes and high blood pressure
• How the water is used: at Sahako no Yu the water flows freely from the source
• Volume pumped: 5 tons per minute (2 tons from the Yumoto Property Ward and 3 tons from Hawaiians)
• Day-trip bathing (Sahako no Yu): 10:00-22:00, with entry until 21:00. Bathing costs 300 yen for adults (junior high school age and above) and 150 yen for children (aged 6 and above up to elementary school age); preschool children enter free
• Closing days: the third Tuesday of each month (the following day when it falls on a public holiday) and New Year's Day
• Bathing rooms: there is an octagonal cypress bath called Kofuku no Yu and a rock bath with a cascading utase shower called Takara no Yu, and the men's and women's baths swap over each day
• Barrier-free access: there is a bathing room for people with disabilities called Choju no Yu, which must be reserved in advance
• Resting: on the second floor there is a hot spring exhibition corner, a changing room for resting and a massage room. The great hall on the third floor can be rented by the hour (for non-profit use with no admission charge, all the rooms cost 1,100 yen and a single room 550 yen)
• Check whether it is open: Sahako no Yu closed temporarily from June 24, 2026 after Legionella bacteria were detected in the bath water, and reopened on August 5, 2026. It also closed for the same reason in December 2025, so it is worth checking that it is open before you set out
• Day-trip bathing at the inns: the Iwaki Yumoto Onsen Ryokan Cooperative lists Fuki no Yu, Shohakukan, Furutakiya, Spa Hotel Sumirekan, Ryokan Koito, Iwaso, Iwaki Yumoto izumiya, Ujo no Yado Shintsuta and Shunmi no Yado Uosho as inns that accept day visitors for bathing. Reception times and prices differ from inn to inn, so it is safest to call before you go
• Parking: 61 spaces for ordinary cars and 6 for large vehicles. When car parks 1 and 2 are full, you can also use the second car park of the Iwaki City Coal and Fossil Museum, Horuru
• Getting there: 10 minutes on foot from Yumoto Station on the JR Joban Line. It is a 2-minute walk from the Onsen Jinja-mae stop on the bus bound for Hawaiians, or a 4-minute walk from the Kanmachi Fumikiri stop on the Katahama loop bus. By car it is 10 minutes from Iwaki-Yumoto IC on the Joban Expressway
• The building: a purely Japanese-style building recreating the style of the late Edo period, marked by the Sahako Gate and a fire lookout tower. It is a steel-frame structure with one basement level and four floors above ground
• Time needed: about an hour if you only take a bath. Allow a full day if you combine it with Hawaiians or the Coal and Fossil Museum Horuru
• Address: 176-1 Sahako, Joban-Yumotomachi, Iwaki City, Fukushima

📚 Sources

The spring quality, the pumping system and the figure of 5 tons per minute come from the Features of the Hot Spring page on the official website of the Iwaki Yumoto Onsen Ryokan Cooperative. The opening hours, closing days, bathing fees, great hall rental charges, hot spring analysis and layout of the bathing rooms at the Sahako no Yu public bathhouse come from that bathhouse's official website, while the number of parking spaces, the temporary closure and the reopening on August 5, 2026 were confirmed on the facility guide page of the official Iwaki City website. The record in the Engishiki Jinmyocho register, the legend of Sahako, the halt of the spring flow in 1919 and its revival in 1942, and the opening of the Joban Hawaiian Center in 1966 come from the History of Iwaki Yumoto Onsen page on the official website of Furutakiya, an inn at Iwaki Yumoto Onsen. Opening status and prices are subject to change, so please check the official information before you set out.