Seoul Sewerage Science Museum

Seoul built the cleaning system beneath its feet

Beneath the Seoul Sewerage Science Museum, wastewater treatment continues out of public sight. Upstairs, exposed pipe sections and models show how used water travels from an apartment to a treatment plant; outdoors, recycled water feeds a small stream and planted wetland. The museum stands where Korea's first municipal wastewater treatment works opened in 1976

The original Cheonggyecheon Sewage Treatment Plant was later incorporated into what became the Jungnang Water Reclamation Center. During rapid urbanisation, Cheonggyecheon and the Han River carried growing amounts of untreated waste. Seoul had begun covering the polluted inner-city stream in 1958, and the first sewage works was part of the expensive infrastructure that would eventually change the quality of water downstream

Across South Korea, sewerage service coverage stood at just 8.3% in 1980. Additional treatment works followed through the 1980s, with more advanced processes introduced in subsequent decades. The museum opened on 5 September 2017 on the older facility's grounds, after a modernisation project moved parts of the treatment process underground and created public exhibition and parkland above. A building that visitors might think of as an ordinary environmental museum sits in the operating landscape it describes

The first-floor historical gallery includes a model of drainage ditches from Korea's Bronze Age, later stone and clay drains, and accounts of Joseon-era Cheonggyecheon works. In 1760, King Yeongjo ordered a major clearing of the stream known as Gyeongjin Juncheon. An illuminated map and models then place the twentieth-century plant alongside Seoul's other water-reclamation centres. The scale changes from a street drain to an entire city's obligation to move wastewater safely

From pipes to the invisible workforce

The historical drains pose a modern problem: what happens after that water enters an underground city network? The technical gallery displays different types of sewer pipes and construction materials. The first choice is architectural: combined systems carry rainwater and wastewater together, while separate pipes collect them independently. A street-level model reveals the pipe network that buildings usually conceal. The gallery explains how pipes are installed, maintained and repaired before the water even reaches a plant

At the works, screens and models trace wastewater through physical removal of large debris and suspended solids, biological treatment by microorganisms, chemical processes where needed and disinfection before release. A model of the Jungnang plant connects the tanks, machinery and underground modernisation. The active centre uses activated-sludge treatment, including advanced A²O and MLE systems that control oxygen conditions while microorganisms break down pollutants. The visible equipment is a representation of treatment technology, not an invitation to explore industrial tanks without supervision

Treatment reduces pollutants before effluent returns to waterways, and some treated water can be used for purposes that do not require drinking-water quality. The stream and wetland outside use reclaimed water, so the pipe and tank models indoors correspond to water management visitors can see in the landscape

The garden is another kind of treatment diagram

The resource-recovery display includes phosphorus, a nutrient that can be extracted for fertiliser, plus sewage heat and small hydropower as broader possibilities. Biogas has an actual local example: Jungnang's digester gas feeds a city-gas purification scheme. Seoul describes a design supply of roughly 26,000 cubic metres of raw gas a day, with annual upgraded output equivalent to the consumption of about 7,000 households. Those figures describe the city's energy-recovery scheme, not machines open to unsupervised museum visitors

The outdoor Water Cycle Theme Park extends the museum into four landscape areas. Rain gardens and rainwater storage demonstrate low-impact ways of absorbing or retaining runoff near where it falls, rather than sending all of it immediately into underground drains. A naturalistic channel and restored wetland show where treated water can be put to non-potable use. Waterwheels based on Archimedes' principles and a hand pump let children move water mechanically. These are devices to play with and understand flow, distinct from the municipal wastewater machinery below

The second floor has a children's learning space with animation about the birth and circulation of water, and exhibits on the reuse of treated water. For visitors who want a closer look at the real plant, guided wastewater-facility tours are offered separately through Seoul's public booking system. They may include a supervised outdoor plant area; museum admission alone does not authorise unescorted entry to operating treatment equipment. A VR tour also covers the galleries and plant processes online

Before you go

The museum is free and opens Tuesday through Sunday, 09:00–17:00; it closes on Mondays, January 1 and the days of Seollal and Chuseok. The first-floor gallery, children's learning space and outdoor water-cycle grounds make a flexible visit, while educational programmes and plant tours have separate booking, age and safety rules. The building and outdoor facilities may have different accessibility constraints, so ask about a specific guided route

The site is inside Jungnang Water Reclamation Center, at 64 Jadongchasijang 3-gil, Seongdong-gu. From Janghanpyeong Station (Line 5), Exit 8, the route runs roughly 400 metres towards Dapsimni, then turns into the lane between Mirabeau Tower and the neighbouring building before continuing past the water centre's west gate. Total walking time is about ten minutes. Buses 130, 303, 370 and 721 serve Cheongnyeonhoeso (Youth Association) stop. On-site parking is limited and costs ₩300 per ten minutes; the museum recommends public transport