Seoul Urban Solutions Agency

Water Management


Water Management

Arisu – one of the safest and best quality drinking water

Seoul is blessed with the Han River, an abundant body of water where Arisu is sourced from. Arisu undergoes tap water quality tests for 163 substances as recommended by the WHO including direct tests on 5 major substances such as residual chlorine, turbidity, hydrogen ion concentration, iron and copper.

  • 10 million : Population served
  • 3.2 million m² : Average daily production
  • 4.35 million m² : Daily production capacity
  • 13,846 km : Tap water piping network
  • 94% : Rate of water flow

Strict Quality Control

Number of Water Quality Items Tested

items tested
# of Items

Inexpensive & 24/7 Supply

Water Utilities Bill of the World’s Major Cities

Revenue Water Ratio of the World’s Major Cities


Production/Impose Volume & Rate of Water Maintained

Smart Operation

Water Purification Centers

Approximately 3.2 million m3 of water is required to serve 10 million citizens each day. SMG operates six purification centers and five water intake stations to produce a vast amount of tap water.

Waste Water Management


  • 10 million:  Population served
  • 5.8 million m³:  Capacity per day
  • 10,500 kl:  Night soil & septic
  • 700 tons:  Daily sludge treatment
Before 19601960s ~ 1970s1980s ~ 1990s2000 ~ Present
  • GNI : USD 80/capita
  • Area : 268km2
  • Pop. : 2.4 mil.
  • GNI : USD 1,645
  • Area : 605km2
  • Pop. : 8.3 mil.
  • GNI : USD 10,841
  • Area : 605km2
  • Pop. : 10.3 mil.
  • GNI : USD 20,250 (2010)
  • Area : 605km2
  • Pop. : 10.17 mil.
  • No Treatment plants
  • Sewage and night soil discharged into streams and Han River
Streams in Seoul severely contaminated
  • All 36 streams dangerous
  • 24 streams covered up
Increase in sewage volume
Serious Pollution
  • Greater demand to improve environment
  • Mandatory onshore treatment of sludge
  • Strengthened sewage treatment standards
Reconstruction and extension of sewers(225km)
  1. Institutional arrangements and organization reform
  2. Construction of 5,940km sewers
  3. Open sewers were covered up
  4. Construction of two sewage treatment facilities
  1. Master plan for sewage and drainage in Seoul (1983)
  2. Expansion of sewage treatment facilities
  3. Introduction of separate pipes to separate rain and waste water
  4. Rehabilitation of existing pipes
  5. Introduction of Trenchless Pipe Lining in pipe maintenance(1995)
  1. Construct sludge treatment facilities
  2. Introduce advanced sewage treatment facilities
  3. Transform into a facility that produces new and renewable energy
  4. Ensure transparent management of the sewage treatment facilities
  5. Eliminate sewer plant odor and build parks for citizens

Han River Water Quality – Gayang point

Sewage Treatment Centers

Seoul operates 4 Sewage Treatment Centers to treat 5 million tons of sewage, excreta and food waste water in a clean and safe manner. The center contributes to water quality improvement in rivers and a healthy aquatic ecosystem.

Learn more

Seoul Solution: Water Management

Water Management Brochure