The Pump House of Nagaoka’s First Waterworks
The Former Nakajima Water Purification Plant Pump Room Building (旧中島浄水場ポンプ室棟) is the pump house of a water purification plant of 1927 in Suidocho, Nagaoka City, Niigata Prefecture, and was registered as a Registered Tangible Cultural Property (structure) on December 24, 2013 (Agency for Cultural Affairs). In romanised Japanese it is Kyū Nakajima Jōsuijō Ponpushitsu-tō.
The Agency records an L-shaped, single-storey reinforced concrete building with a flat roof and a building area of 295 square metres; registration number 15-0382.
The Former Nakajima Water Purification Plant Pump Room Building is the largest of the three registered buildings left from the plant, alongside the monitoring room and the standby generator room. According to the chronology kept by the Nagaoka City Waterworks Bureau, the founding works were completed in March 1927, when the Nakajima plant and its water tower were finished.
A Facade of Giant Pilasters and an Arch
Of the two wings of the L-shaped plan, the front one held the high-lift pumps (Agency for Cultural Affairs). An entrance porch projects from the centre of this front, and above it a Parapet rises in the outline of a semicircular arch.
The elevation is strictly symmetrical and carries a giant order of pilasters across its full height. The base is faced with stone, so the reinforced concrete reads as a heavy masonry building, while key details are finished in an Art Deco manner (Agency for Cultural Affairs). The Former Nakajima Water Purification Plant Pump Room Building gives a utilitarian building of 1927 the look of a stone public building.
Why It Was Registered
The Agency for Cultural Affairs registered the Former Nakajima Water Purification Plant Pump Room Building as a model of design. Its description points to the symmetrical front with giant pilasters, the weighty stone-like exterior and the Art Deco details.
Nagaoka began supplying piped water in part in August 1926; the Waterworks Bureau chronology counts it as the 81st waterworks in Japan. The pump room belongs to that founding generation and was registered in 2013 together with the monitoring room and the standby generator room.
What to Look For
Standing in front of the building, the first thing to catch the eye is the arched parapet rising over the porch. Pilasters march out to either side at an even rhythm, dividing the wall into tall bays.
Look at how the stone-faced base gives weight while the Art Deco touches keep the design crisp (Agency for Cultural Affairs). The small monitoring room to the south-west repeats the same vocabulary, so the Former Nakajima Water Purification Plant Pump Room Building is worth comparing with it.
Visiting
The Former Nakajima Water Purification Plant Pump Room Building stands inside Suido Park, and its exterior can be seen from the park grounds. The porch front is the side to start from, since that wing was the high-lift pump room. No official information was found on interior access or photography rules (checked November 2026).
Q&A
- When was the Former Nakajima Water Purification Plant Pump Room Building built?
- In 1927 (Agency for Cultural Affairs). The Waterworks Bureau chronology also dates the completion of the Nakajima plant to March 1927.
- What does the Former Nakajima Water Purification Plant pump room look like?
- It is a single-storey, L-shaped reinforced concrete building with a symmetrical front of giant pilasters, an arched parapet over the porch, a stone-faced base and Art Deco details (Agency for Cultural Affairs).
- Can you go inside the Former Nakajima Water Purification Plant pump room?
- No official information on interior access was found. The exterior can be seen from Suido Park.
- Where is the Former Nakajima Water Purification Plant Pump Room Building?
- In Suido Park, Suidocho, Nagaoka City, Niigata Prefecture.
- When was the Former Nakajima Water Purification Plant Pump Room Building registered?
- On December 24, 2013 (Agency for Cultural Affairs).
Basic Information
| Name | Former Nakajima Water Purification Plant Pump Room Building (旧中島浄水場ポンプ室棟) |
|---|---|
| Location | 3-247-2 Suidocho, Nagaoka City, Niigata Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered 2013/12/24 (Heisei 25) |
| Quantity | 1 building |
| Dimensions | Reinforced concrete, single storey, building area 295 m² |
| Owner | Nagaoka City |
| Public Access | Exterior visible from Suido Park; no official information on interior access |
References
- Former Nakajima Water Purification Plant Pump Room Building (Database of National Cultural Properties, Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00009745
- Nagaoka Waterworks, FY2022 edition (Nagaoka City Waterworks Bureau, Japanese)
- https://www.city.nagaoka.niigata.jp/suidou/doc/suidou/w-s_summary/summary-r04.pdf
- Suido Park (Niigata Prefecture Tourism Association, Japanese)
- https://niigata-kankou.or.jp/spot/detail_43801.html
Last verified: 2026.11.14
