main menu


On&Off Real-Time
Water Quality
Openning Services
Unpsa 2009 Winners
Information on
and Sewage Billing
in English
Dasan 120 callcenter
For Foreigners
(02)120 + 9
① English   ② 中國語
③日本語   ④ Tiếngviệt
⑤ Монголхэл
Monday thru Friday
09:00am - 06:00pm
Weekdays only.
  • HOME >
  • Aiming for the World’s Best Quality >
  • Scientific Water Management

Scientific Water Management

Strict Water Quality Inspection for Safe Tap Water Production

The Seoul Metropolitan Government conducts water quality inspection on 172 indicators beyond the recommendation by WHO guidelines (tests for cutlassfish larvae added). Water quality inspection is performed on the water produced in the Arisu Purification Center daily and tap water collected from 450 points across Seoul. In addition, quarterly water quality inspection is conducted at 24 points for stricter water quality control. At the same time, the Arisu Purification Center is conducting real-time surveillance for eight water quality indicators by production process using an automatic water quality measuring unit. Accordingly, the Seoul Metropolitan Government is exerting all-out efforts toward producing and delivering safe tap water.

Seoul Water-Now System

Seoul Water-Now System monitors tap water produced in the purification centers 24 hours a day on a real-time basis. Monitoring is carried out in relation to 11 items at a total of 186 points divided into 5 intake points, 6 purification centers, A total of 11 items at 525 points including 90 outlets and 424 water pipes by each stage of tap water delivery to the citizens in Seoul. Through this system, the quality of water consumed by the citizens is managed in real time and round the clock. and will be continuously increased in the future. Since 2008, data on the analysis of tap water quality in relation to this system have been disclosed in Seoul Waterworks Authority website ( Likewise, since 2011, the data have also been posted for access via mobile phone (Mobile Arisu App) or in an electronic signboard for air pollution.

seoul water-now system

Arisu Map

It is a tap water information map for viewing the information on tap water in the region of residence of citizens at a glance. It is possible to easily and conveniently search information on the quality of tap water in your neighborhood, supply route of Arisu and status of construction in your neighborhood, etc. by selecting the location on the map. It is being supplied through the website,

  • Information on the quality of water in your neighborhood: Provision of water quality information measured with automatic quality measurement device in your neighborhood every 20 minutes
  • Arisu supply route: Arisu supply route and water quality for each route are provided when you select the location of your home on the map
  • Arisu information: Provides information on the location of drinking fountain in parks, construction and competent waterworks offices.
Seoul Water Institute

The Seoul Water Institute focuses on studying tap water quality to provide safe, high-quality water throughout the future. It conducts precision inspections on 172 water quality items beyond the WHO recommendation and regularly posts the results on its website. In addition, it pursues waterworks technology development in line with the international trend of low carbon, green growth. At the same time, the Seoul Water Institute is providing 16 training courses including the water quality management course for the purpose of fostering waterworks specialists. The institute is producing technological outcomes in various fields ranging from the hi-tech membrane separation (operation) technology and environment-friendly ozone process to rust-free pipe development. The Seoul Water Institute has acquired 10 domestic patents and international patents, and supports various water supply projects by providing advanced technologies accumulated over many years.

Testing Institution Designation Status

information about the Testing Institution Designation Status and Related Supporting Fields
Nov. 1989 Designated as a drinking water quality inspection institution
Apr. 2003 Designated as a nationally authorized virus testing institution
Sep. 2004 Designated as a nationally authorized protozoa testing institution
Jan. 2005 Designated as KS Q ISO/IEC 17025(KOLAS)-certified test lab
Jun. 2009 Designated as a nationally authorized Norovirus testing institution