Websolus Co., Ltd. operates water related business, such as engineering, system integration, construction and operation. It also manufactures high pressured waterline camera, sewer line pipe video inspection crawler & sewage line pushrod camera. It was founded on January 15, 2001 and is headquartered in Seoul, South Korea.

Saehan Co. Ltd. is a private company headquartered in the South Korea. The firm manufactures sanitary paper products.

Taisei Corporation (大成建設株式会社 Taisei Kensetsu Kabushiki-gaisha) (TYO: 1801) is a Japanese corporation founded in 1873. Its main areas of business are building construction, civil engineering, and real estate development. Taisei's headquarters are located at Shinjuku Center Building in Nishi-Shinjuku, Shinjuku, Tokyo.

Jiangsu East China Geological Construction Group Co., Ltd., established on 1985-02-13, Business scope includes geological exploration,Engineering survey and engineering design,Mapping service,Technical testing,Environmental Monitoring and Environmental Governance,Engineering Management Services,Tailings Treatment,drilling,Logging,Mud logging,housing construction,Civil Engineering Construction,Building Decoration,business management,Investment and Asset Management,Engineering technology research and experimental development,Technical extension services,Technology intermediary service,Foundation and Foundation Engineering,Municipal Engineering,plumbing,Mechanical and electrical equipment installation engineering,Construction of steel structure engineering,Machinery and Equipment Leasing,Material rental.(Items subject to approval by law,Business activities can only be carried out after approval by relevant departments)

Baohang Environmental Restoration Co., Ltd., established on 2016-08-18, Business scope includes design for environmental remediation,consult,Technical Services;Environmental Pollution Prevention Technology and Engineering;Construction General Contracting;Professional contractors;Accept entrustment to provide operation of environmental pollution control facilities;Technology Import and Export,Import and export,Agent import and export;Sales of environmental remediation equipment,facility,chemical agent(Does not contain dangerous chemicals and a class of precursor chemicals).(Enterprises independently choose operating projects according to law,Carry out business activities;Items subject to approval by law,Carry out business activities in accordance with the approved content after approval by relevant departments;Do not engage in the business activities of projects prohibited and restricted by the city's industrial policies.)

Sejong Construction Co., Ltd. is a South Korean private company with domestic subsidiaries, that engages in housing construction services.

DuPont Mitsui Fluorochemicals Co., Ltd., part of Mitsui Chemicals, Inc., is a company headquartered in Japan that manufactures industrial inorganic chemicals.

Korea Institute of Civil Engineering and Building Technology contributes to the development of the Korean construction industry.

Dreambios Co., Ltd. is a holding company, which provides services related to assessment and remediation of water, soil, and wastes. Its business area are Bioenergy Division, Environmental IT Division, and Soil Remediation Division. Bio-energy Division is responsible for the recycling of livestock, food, contaminated water, and organic solid waste. Environmental IT Division offers services including water quality monitoring and waste water treatment and process management. Soil Remediation Division manufactures equipment for treatment of contaminated soil such as grouting system and photo ionization detector. The company was founded in October 1993 and is headquartered in Seoul, South Korea.

Chung Woo Industrial Co., Ltd. is a private company headquartered in the South Korea. The firm wholesales kitchen products.

Hyunjin Co. Ltd. engages in construction of residential and commercial building and Social Overhead Capital. The company was founded on July 31, 2000 and is headquartered in Seongnam, South Korea.

DAECHANG Co., Ltd. engages in the manufacture of non-ferrous metal products. Its products include free cutting, forged, and high-strength brass rods, brass class two, dezincification resistance brass, lead free brass, and copper anode. The company was founded on December 19, 1977 and is headquartered in Siheung-si, South Korea.

POSCO Holdings Inc. engages in the production of steel products. It operates through the following divisions: Steel, Engineering & Construction and Trading. The Steel division produces cold rolled, hot rolled and stainless steel products, plates, wire rods and silicon steel sheets. The Engineering & Construction division engages in the planning, designing and construction of industrial plants, civil engineering projects, commercial and residential buildings. The Trading division exports and imports steel products and raw materials. The company was founded by Tae-Joon Park on April 1, 1968 and is headquartered in Seoul, South Korea.