Hatao Basin Spring Water Group Kanagawa Prefecture｜Complete Guide to Famous Water Spots from Japan’s Top 100 Waters
Hatao City, located in western Kanagawa Prefecture, is known as a “famous water village” with the only basin topography in the prefecture. The “Hatao Basin Spring Water Group,” designated as one of Japan’s Top 100 Famous Waters by the Ministry of the Environment in 1985, is an area abundant with the blessings of water, where clear groundwater nurtured by the rich nature of the Tanzawa Mountains springs forth at various locations throughout the city.
Despite being just about an hour away from Shinjuku by Odakyu Line, Hatao City is blessed with abundant spring water. This article thoroughly introduces Hatao’s water culture, including the charm of the Hatao Basin Spring Water Group, recommended spring water spots, and famous restaurants that utilize famous water.
About the Hatao Basin Spring Water Group｜Kanagawa’s Treasure Selected as One of Japan’s Top 100 Famous Waters
Kanagawa’s Only Basin Creates a Natural Water Reservoir
The Hatao Basin is Kanagawa Prefecture’s only basin, surrounded by the Tanzawa Mountains to the north and the Oiso (Shibusawa) Hills to the south. This unique topography is the primary factor that makes Hatao a “city of water.”
The underground structure of the basin is truly a “natural water reservoir.” Rain and snow that falls on the Tanzawa Mountains passes through geological layers over long periods and accumulates underground in the basin. This groundwater reservoir contains approximately 750 million tons of groundwater, equivalent to approximately 2.7 times the volume of Lake Ashi in Hakone.
The alluvial fan topography formed by rivers such as the Mizunashi, Kuzuha, and Kaneme rivers flowing from the Tanzawa Mountain range includes highly permeable sand and gravel layers, functioning as a natural filtration system for groundwater. Through this natural mechanism, Hatao’s groundwater maintains high purity.
History and Evaluation of the Top 100 Famous Waters Designation
In 1985, the Hatao Basin Spring Water Group was selected as one of Japan’s Top 100 Famous Waters by the Ministry of the Environment (then the Environmental Agency). This is not a single spring but a collective term for multiple spring water spots scattered throughout Hatao City.
Furthermore, in March 2016, “Delicious Hatao Water～Tanzawa’s Droplet～,” a bottled groundwater from Hatao, won first place nationally in the “Delicious Famous Water Division” of the Top 100 Famous Waters Election. This achievement made the high quality of Hatao’s water known nationwide.
The selection was based on abundant spring water volume, excellent water quality, and preservation activities by local residents. More than 50 spring water sites have been identified in the city, and many continue to spring forth clear water today.
Why Hatao’s Groundwater Is So Clear
The reason Hatao’s groundwater is particularly clear lies in its formation process.
First, the forests of the Tanzawa Mountains function as a natural filter. As precipitation passes through forest soil, impurities are removed, and the water becomes mineral-rich in appropriate amounts.
Next, water that has infiltrated underground passes through geological layers such as sand and gravel and volcanic ash layers over a long period. This natural filtration process further improves water quality. Hatao’s groundwater is said to take several decades to several hundred years from infiltration to emergence, and this long residence time contributes to the stability of water quality.
Additionally, the closed geographical form of the basin creates an environment less susceptible to external contamination. Hatao City has enacted a groundwater protection ordinance and works toward proper groundwater use and water quality preservation, and preservation activities involving both government and citizens are important factors in protecting clear water.
Where to Collect Famous Hatao Water｜8 Recommended Spring Water Spots
While there are numerous spring water spots throughout Hatao City, here we introduce spots that have been developed as water collection areas and are easily accessible.
1. Kobo no Shimizu (Kobo’s Clear Water)｜Famous Water with Kobo Daishi Legend
About 15 minutes on foot from Hatao Station, despite being in an urban area, “Kobo no Shimizu” boasts abundant spring water.
As its name suggests, a legend related to Kobo Daishi (Kukai) has been preserved. According to tradition, when Kobo Daishi was traveling throughout the provinces, he struck the ground with his staff to provide clear water for villagers suffering from water shortage, and clear water sprang forth.
Currently, approximately 200 liters of water spring forth per minute, and local residents and visitors from distant places come to collect water. The water temperature remains stable at approximately 15 degrees Celsius year-round, feeling cold in summer and warm in winter.
Access Information
- Location: Soyo, Hatao City
- About 15 minutes on foot from Hatao Station on the Odakyu Line
- Parking: Limited spaces; use of public transportation recommended
- Water collection hours: 24 hours (evening visits are not recommended)
2. Yuzuri no Mizu｜Sacred Spring Water at Izumo Taisha Sagami Branch
“Yuzuri no Mizu” is located within the grounds of Izumo Taisha Sagami Branch Shrine and is clear water springing forth in the sacred atmosphere of the shrine.
There are various theories about the origin of the name “yuzuri,” but it is said to carry the meaning of “bestowing” abundant water upon people. This spring water is also used for the shrine’s purification ritual (temizu), and visitors can purify their mind and body with clear water.
The spring water area is well-maintained, with water collection facilities in place. The appeal is the ability to experience water collection in a quiet, spiritual shrine environment.
Access Information
- Location: Hirasawa, Hatao City
- About 10 minutes by bus from Hatao Station on the Odakyu Line, 5 minutes on foot from “Health and Welfare Center Mae” stop
- Parking: Available (for visitors)
- Water collection during visiting hours recommended
3. Gomayadashiki no Mizu｜Popular Spring Water Spot at the Base of Tanzawa Mountains
“Gomayadashiki no Mizu,” located along Prefectural Road 70 heading toward Yabitsutoge Pass, is a popular spring water spot positioned at the base of the Tanzawa Mountains, attracting visitors from throughout Kanagawa and beyond.
Because of its high elevation, the water temperature is particularly low, and even in the height of summer, cold water can be enjoyed. With good water quality, it is a place of respite for locals, mountain climbers, and touring motorcyclists alike.
The water collection area is developed relatively spaciously, allowing multiple people to collect water simultaneously. However, due to its location in a mountainous area, caution is needed regarding freezing and snowfall in winter.
Access Information
- Location: Terayama, Hatao City
- About 30 minutes by bus from Hatao Station on the Odakyu Line, directly off “Gomayadashiki” stop
- Parking spaces: Available (several spaces)
- Note: Be careful of frozen roads in winter
4. Imaizumi Spring Water Pond｜Parent-Child Water Park Near Urban Area
Imaizumi Spring Water Pond is a parent-child water park where rich natural environment is preserved despite being adjacent to residential areas. The pond created using spring water is home to creatures such as medaka fish and crayfish, serving as a place for children’s nature observation.
Since it is developed as a park, visitors can enjoy not only water collection but also walks. Benches and pavilions are available, allowing for leisurely time.
5. Kuzuha Greenery Spring Water｜Spring Water in Verdant Greenland
A spring water spot located in greenland along the Kuzuha River, surrounded by rich nature. The water volume is relatively stable, serving as a place of respite for local residents.
A walking trail is also developed within the greenland, allowing for walks while viewing the spring water. From cherry blossoms in spring to fresh greenery in summer to autumn foliage, visitors can experience seasonal nature while touching the famous water.
6. Kobo Mountain Water｜Spring Water on Hiking Course
A spring water spot located on the hiking course of Kobo Mountain Park, popular among climbers. Due to its high elevation, particularly in summer, cold and refreshing water soothes tired bodies.
Kobo Mountain is also known as a famous cherry blossom viewing spot, allowing visitors to enjoy both flower viewing and famous water simultaneously in spring. It is an ideal place to stop by during a hike.
7. Spring Water Around Shinsho Lake｜Mystical Lake Born from Earthquake
Shinsho Lake was created by mountain collapse during the 1923 Great Kanto Earthquake. There are multiple spring water points in the surrounding area as well. The landscape created by the lake, spring water, and surrounding nature has a particularly mystical atmosphere among Hatao locations.
Visitors can walk along a lakeside trail and visit spring water spots. It is a place where one can experience unique spring water appreciation where history and nature merge.
8. Touge Spring Water｜Water Source Maintained by Local Residents
A water area set up by local residents using excess water from the Touge intake facility. It exemplifies community-driven water source preservation and symbolizes Hatao City’s spring water culture.
The area is well-maintained by local residents and kept clean. When visiting, remember the gratitude toward local residents and observe proper etiquette when using the facility.
Tasting Hatao’s Famous Water｜5 Famous Restaurants Utilizing Famous Water
Hatao’s abundant spring water is deeply rooted in the region’s food culture. Here are famous restaurants that utilize famous water.
1. Kanai Sake Brewery｜Hatao’s Only Historic Sake Brewery
Founded in 1880 (Meiji 13), Kanai Sake Brewery is Hatao City’s only sake brewery. The signature brand “Shirasasa Tsudzumi” uses Hatao’s famous water as brewing water and is characterized by a crisp taste.
The brewery also offers tours (by reservation), where visitors can learn about the sake-making process and understand how famous water transforms into sake. The direct sales shop allows tasting, where the blessings of famous water can be fully appreciated.
Store Information
- Location: Yanagimachi, Hatao City
- Access: About 10 minutes on foot from Hatao Station on the Odakyu Line
- Hours: 9:00～17:00 (Closed: Sundays and Holidays)
2. Teuchi Soba Iseshoan｜Handmade Buckwheat Noodles Using Tanzawa’s Famous Water
A famous soba restaurant with particular attention to locally-produced buckwheat flour and Hatao’s famous water. Since water quality greatly influences soba taste, Iseshoan’s soba is a masterpiece where the blessing of famous water is fully felt.
The soba dipping sauce also uses famous water, with a delicate taste that brings out the soba’s original flavor. Side menu items such as tempura are also well-stocked, allowing for leisurely time.
Store Information
- Location: Hatao City (confirm details)
- Hours: 11:00～15:00, 17:00～20:00 (Closed: Wednesdays)
3. Teuchi Soba Sakama｜Exquisite Soba Using Famous Water and Sake Side Dishes
A famous restaurant offering handmade soba using Hatao’s famous water and local sake with seasonal side dishes. Not only soba but also side dishes served as sake accompaniments utilize famous water, with water quality enhancing the overall quality of dishes.
The calm atmosphere of the store allows visitors to thoroughly enjoy Hatao’s food culture. Sake from the local Kanai Sake Brewery is also stocked, where one can enjoy a pairing of soba made with famous water and sake.
Store Information
- Location: Hatao City (confirm details)
- Hours: 11:30～14:30, 17:30～21:00 (Closed: Mondays)
4. Mori no Tofu Kobo Mikawaya｜Tofu and Sweets Made from On-Site Spring Water
A workshop that manufactures tofu using spring water that wells up on the premises. The power of famous water to maximize soy flavor creates tofu that is rich yet has a crisp aftertaste.
Beyond tofu, sweets using soy milk are also popular. Soy milk soft serve ice cream and soy milk pudding and other products are available that allow one to feel the blessings of famous water and soybeans. These make ideal souvenirs.
Store Information
- Location: Hatao City (confirm details)
- Hours: 10:00～17:00 (Closed: Irregular)
5. Cafes and Restaurants in Hatao City｜Famous Water Coffee and Cuisine
Various cafes and restaurants scattered throughout Hatao City serve coffee and cuisine using famous water. In this blessed environment where tap water itself is famous water, many dining establishments offer high-quality cuisine using good water.
Coffee in particular is susceptible to water quality influence, and coffee brewed with Hatao’s famous water has little off-flavor, allowing the natural flavor of beans to stand out. When exploring the city, be sure to taste famous water coffee at a cafe.
Practical Information for Enjoying the Hatao Basin Spring Water Group
Water Collection Etiquette and Precautions
When enjoying Hatao’s spring water, observe the following etiquette.
Basic Etiquette
- Do not monopolize water collection areas; share in a spirit of consideration
- Always take trash with you
- Do not damage plants around spring water sites
- Obtain owner permission if on private property
- Avoid visiting late at night or very early morning (near residential areas)
Regarding Water Quality
Although designated as a famous water, consuming it is done at one’s own risk. If concerned, it is recommended to boil the water before use. Hatao City regularly conducts water quality testing at major spring water sites, with results published on the city website.
Convenient Items to Bring
- Clean containers (plastic bottles or water carriers)
- Towel (for wiping up spilled water)
- Boots or waterproof shoes (spring water areas often have wet ground)
- Insect repellent spray (essential in summer and naturally abundant areas)
Access and Surrounding Sightseeing
Access by Public Transportation
Hatao City is accessible about an hour from Shinjuku by Odakyu Line. Hatao Station on the Odakyu Odawara Line serves as the gateway. From the station, route buses operate to various locations throughout the city, with access to major spring water spots.
However, for mountain area spring water spots (such as Gomayadashiki no Mizu), bus services are limited, so checking schedules in advance is recommended.
Access by Car
About 15 minutes from Hatao Nakai IC on the Tomei Expressway. Urban spring water spots are relatively accessible, but some mountain area spots have narrow roads requiring careful driving.
Nearby Sightseeing Spots
Sightseeing spots to enjoy along with spring water tours:
- Kobo Mountain Park: Hiking course known as a famous cherry blossom spot
- Shinsho Lake: Mystical lake born from the Great Kanto Earthquake
- Izumo Taisha Sagami Branch Shrine: Popular shrine of the god of marriage ties
- Tanzawa Oyama Quasi-National Park: Natural abundant area for mountain climbing and hiking
- Hatao Togawa Park: Spacious prefectural park, popular “Wind Suspension Bridge”
Best Seasons and Ways to Enjoy
Spring (March～May)
Cherry blossoms at Kobo Mountain Park bloom, allowing simultaneous enjoyment of flower viewing and spring water tours. Temperatures are mild, making it ideal for walks. Water collection amid fresh greenery offers an exceptional sense of refreshment.
Summer (June～August)
Cold spring water feels most pleasant in this season. Particularly, Gomayadashiki no Mizu at high elevation remains surprisingly cold even in midsummer, making people forget the heat. However, this period has many insects, so insect repellent precautions should not be forgotten.
Autumn (September～November)
During autumn foliage season, spring water can be enjoyed against the backdrop of colored mountains. Cooler temperatures make the difference between water temperature and air temperature smaller, allowing for comfortably cold water collection.
Winter (December～February)
Spring water maintains stable temperature year-round, feeling “warm” in winter. However, mountain area spots may have snow and freezing conditions, requiring careful access. Urban spots like Kobo no Shimizu are easier to visit in winter.
Hatao’s Groundwater Preservation Efforts
Preservation Activities with Citizens and Government Working Together
Hatao City, to pass on precious groundwater resources to the future, cooperates with citizens to engage in preservation activities.
Hatao City Groundwater Protection Ordinance
The ordinance enacted in 1985 aims at proper groundwater use and water quality preservation. Large-scale groundwater extraction requires permission, with extraction volume management implemented.
Groundwater Recharge Project
To increase groundwater, efforts to allow rainwater to seep underground are underway. Use of permeable pavement and installation of rainwater infiltration pits, among others, aim for both urban development and groundwater preservation.
Water Source Area Preservation
Preservation of Tanzawa Mountain forests is an important effort. Healthy forests become the source of quality groundwater. Regular citizen volunteer activities including tree planting and thinning operations are conducted.
“Delicious Hatao Water～Tanzawa’s Droplet～”
“Delicious Hatao Water～Tanzawa’s Droplet～,” bottled groundwater from Hatao, is sold at city public facilities and some stores. Part of sales revenue is used for groundwater preservation activities, allowing purchasers to contribute to preservation efforts.
Winning first place nationwide in the Top 100 Famous Waters Election in 2016 gave Hatao’s famous water nationwide recognition. This evaluation is also a result of years of preservation efforts.
History and Culture of Hatao Basin Spring Water Group
Coexistence with Water Dating Back Centuries
The relationship between Hatao people and spring water dates back to ancient times. Archaeological sites from the Jomon period show that settlements formed near water, indicating that abundant spring water has supported people’s lives.
During the Edo period, spring water played an important role as agricultural water irrigating the Hatao Basin’s rice fields. Additionally, milling using water wheels was prosperous, with spring water blessings supporting regional industries.
Kobo Daishi Legend and Belief
Multiple spring water legends related to Kobo Daishi remain in Hatao City. The tradition that the Daishi struck the ground with his staff to produce spring water, beginning with Kobo no Shimizu, expresses people’s gratitude and faith regarding water.
At these spring water sites, statues of Jizo and small shrines are often enshrined, carefully maintained by local residents. Spring water has been positioned not merely as a water resource but also as an object of belief throughout history.
Water Use and Preservation Since Modern Times
After the Meiji period, as modern waterworks developed, spring water use continued in Hatao. In the early Showa period, industries using spring water such as sake brewing and tofu manufacturing flourished, strengthening the city’s character as a “town of water.”
During Japan’s rapid economic growth, concerns arose about lowering groundwater levels and water quality deterioration. In response, a groundwater protection ordinance was enacted in 1985, and with the simultaneous designation as one of Japan’s Top 100 Famous Waters, momentum for preservation increased.
Currently, sustainable water resource management is implemented while balancing preservation and use.
Conclusion｜Experience the Blessings of Famous Water at Hatao Basin Spring Water Group
The “Hatao Basin Spring Water Group,” nurtured by Kanagawa’s only basin, is a precious water resource created by the rich nature of Tanzawa and long history. Selected as one of Japan’s Top 100 Famous Waters and further recognized as number one nationally, its water quality continues to fascinate visitors.
Spring water spots scattered throughout the city allow visitors to actually collect famous water, and Hatao’s food culture using famous water—including sake, soba, and tofu—can also be enjoyed. The appeal includes easy access, about an hour from Shinjuku, making same-day visits entirely feasible.
Through spring water tours, one can feel the importance of water, nature’s blessings, and the preservation efforts of local people. When visiting Hatao, be sure to tour multiple spring water spots and taste each one’s individuality.
Famous water nurtured by Tanzawa Mountains, accumulated by the Hatao Basin, and preserved by local people for generations. Why not embark on a journey to experience these clear blessings with all five senses?
Pre-Visit Checklist
- Prepare water collection containers
- Dress appropriately for weather and season
- Confirm bus schedules (when using public transportation)
- Check spring water site etiquette
- Confirm operating hours of surrounding sightseeing spots
The Hatao Basin Spring Water Group is truly a “living famous water” where nature’s blessings and people’s efforts harmonize. Understanding its value, observing proper etiquette, and fully enjoying the charm of Hatao, the village of famous water.
