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)
- 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)