1997 ~ 2010

• Establishment of Cheonghae Environment (97.2.28).
• Registration for design and construction industries of sewage treatment facilities (98.10.26).
• Registration of personal sewage treatment facility management business (00.7.27)
• Registration of professional construction business (water supply and sewage) (05.6.29).
• Registration for a water quality environment construction project (06.4.7)
• Converting to Cheonghae ENV Co., Ltd. (07.7.1)
• Establishment of an affiliated research institute (09.3.11)
• Designated as a water quality environment management agency (10.4.5)

2011 ~ 2019

• Registration of a company specializing in installing renewable energy facilities (11.4.29).
• Facility maintenance business (14.9.30)
• Public sewage management agency (10,000㎥/day) (14.11.12)
• Public Sewage Management Agency (Sewage Pipeline) (14.11.12)
• Management Innovation Small and Medium Business(MAIN-BIZ) Confirmation (15.5.8)
• The quality management/environmental management certificate update (18.3.30) ISO 9001:2015/14001:2015
• Air environment construction project (18.5.3)
• Environmental testing and inspection institution quality management verification (18.12.18)
• Technology Innovation Small and Medium Business (INO-BIZ) Certification (19.9.5)Engineering business report (19.11.5)

2020 ~

• Designation of an air environment management agency (20.6.4)
• Acquisition of venture company confirmation (20.11.19)
• Cheonghae ENV Co., Ltd. Factory Registration (20.11.20)
• Registration as a star company in Gyeonggi Province (20.12.7)
• Designated as a promising environmental company in Gyeonggi-do (20.12.10)