Marukoma Hot Spring Hotel

Day Use

Yes

10:00–14:00

Day-use bathing runs only on Fridays, Saturdays, and Sundays, 10:00-14:00, and guests are asked to leave the premises by 15:00.

¥1,200

Adult day-use entry is 1,200 yen, elementary-school children 600 yen, and preschoolers 300 yen; children under 3 bathe free.

Bathing & Water

Natural onsen water

Uses natural hot spring water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Dry heat sauna room

Cold BathYes

Cold water plunge bath, typically used after sauna

Capabilities

Private BathYes

Private bath available for day-use visitors or hotel guests to reserve

Room OnsenNo

Private onsen bath in guest rooms, for overnight guests only

All room types listed (family Japanese-style, Japanese-Western, mountain-side) show only a standard unit bath in the amenity list; no room type mentions an in-room onsen bath.

Mixed BathingNo

Shared bathing area for all genders

Site lists separate 男性大浴場 (men's) and 女性大浴場 (women's) bath sections; no mixed-bathing (混浴) is mentioned anywhere on the site.

Policies & Services

TattooYes

Allows entry with visible tattoos

Unverified

KidsYes

Welcomes children and families

DiningYes

Restaurant or dining open to visitors (not just hotel meal plans)

WashingYes

Shower, wash stations, soap and shampoo provided

TowelsYes

Towels available to rent or borrow

Rest AreaYes

Relaxation space for after bathing

ParkingYes

On-site or nearby parking available

丸駒温泉 2号井

Marukoma Onsen Well No. 2

Operated by · 丸駒温泉株式会社

塩

Chloride

+ Bicarbonate · Sulfate

Color: pale yellow, slightly turbid
Taste: tasteless
Odor: odorless

Sodium-Calcium Chloride-Bicarbonate-Sulfate spring

pH 6.9NeutralHot source · 51°CHigh silica

Composition fingerprint1.7 g/kg dissolved · Hypotonic

Na⁺55

Ca²⁺27

Mg²⁺13

Cl⁻47

HCO₃⁻29

SO₄²⁻24

◀ CationsAnions ▶

Sodium Na⁺: salt's cation — pairs with chloride to make the water salty.
Chloride Cl⁻: table-salt anion — coats the skin and holds heat in.

Known good for

Warmingcold sensitivity
Circulationtired legs
Aches & jointsstiff shoulders

A sodium- and calcium-led chloride spring with bicarbonate softness and a quiet sulfate body layered in — a true compound water rather than a single-axis source. Neutral pH keeps the touch gentle, while 1,728 mg/kg of dissolved solids gives enough mineral body to be noticeable on the skin. A generous 241 mg/kg of metasilicic acid puts it squarely in the Japanese 'beauty-water' family — the silica leaves a thin film that makes skin feel noticeably smoother afterwards. The water carries a faint yellow tint with slight turbidity at the source, with no perceptible taste or smell.

Sampled at wellhead·Analyzed Oct 2, 2019·日本衛生株式会社·Cert no. 北海道生衛第0169号

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