Saito Tennen Onsen Sumire-no-yu

Day Use

Yes

Open year-round; last entry is one hour before closing (1:00am on nights the bath closes at 2:00am). It may close temporarily for equipment inspections.

¥900

Weekday adult bathing is 900 yen, weekend/holiday 1000 yen (children and ages 3 to 4 cheaper, ages 2 and under free). A discounted 'Sumire Day' rate (about 750 yen for adults) runs on select dates. The jjimjilbang-style rock-heat area is priced separately from bathing, and under-2s aren't admitted to it.

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

Mixed BathingNo

Shared bathing area for all genders

Site and reviews only reference separate men's/women's pricing and facilities; no mixed bathing is mentioned anywhere.

Policies & Services

TattooNo

Allows entry with visible tattoos

Any tattoo, regardless of size or location, results in immediate removal from the premises and a permanent ban.

KidsWith Conditions

Welcomes children and families

Regular bathing welcomes all ages (under-2s free), but the jjimjilbang-style rock-heat spa area does not admit children age 2 and under.

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

天然温泉すみれの湯

Tennen Onsen Sumire-no-yu

Operated by · 山口建設株式会社

湯

Simple

Color: colorless and transparent
Taste: not recorded
Odor: odorless

Sodium Chloride spring

pH 7.2NeutralHigh silica

Composition fingerprint0.8 g/kg dissolved · Hypotonic

Na⁺63

Ca²⁺17

Mg²⁺16

Cl⁻80

HCO₃⁻16

◀ 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

Smooth skindry, rough skin
Recoveryfatigue, stress

A simple thermal spring pumped at Shimizu in Ibaraki City, neutral at pH 7.2 and lightly mineralized at 793.6 mg/kg of dissolved solids, so it bathes gently with little bite. It carries a fair amount of metasilicic acid (69.9 mg/kg), the kind of silica that leaves a thin film for noticeably smoother skin, and runs colorless, transparent and odorless.

Sampled at wellhead·Analyzed Dec 21, 2017·株式会社ケイ・エス分析センター·Cert no. No.R-0049-1

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