| 86 | Mechanical installation work (2nd phase) during structural construction (other existing facility improvement work) | Techcross Environmental Service Co., Ltd. | Daegu food processing plant | 2020. 03 |
| 188 | Production and installation of local exhaust facilities, air quality permit, hazardous risk prevention plan | PH Energy | PH Energy | 2022.05 |
| 255 | 군사하수사업소 원서포 중계펌프장 토출배관 수선 | 리뉴어스주식회사 | 군산시 하수처리장 | 2024.06 |
| 96 | Installation of odor treatment facility on Munyeo Island, Gunsan | Gunsan City Hall | Munyeo Island Sewage Treatment Plant | 2020. 05 |
| 97 | Installation of odor treatment facility at Gunsan 1 relay pump station | Gunsan City Hall | Gunsan 1st relay pumping station | 2020. 05 |
| 270 | 군산2공장 배기덕트 보수 및 인허가 용역 | 이피캠텍(주) | Gunsan | 2024.12 |
| 123 | Gunsan Industrial Complex 2 wastewater site separation membrane (B series) cleaning | Daehyun E&S | Gunsan Wastewater Treatment Plant | 2021. 03 |
| 242 | Gunsan Public Wastewater Treatment Plant Polymer Dissolution Equipment Replacement Construction Polymer Dissolution Equipment Manufacturing and Purchase | Gunsan City Waterworks Office | Gunsan City Public Wastewater Treatment Plant | 2024.01 |
| 254 | 군산공공폐수처리장 폴리머 용해장치 교체공사 | Gunsan City Waterworks Office | 군산시 폐수처리장 | 2024.05 |
| 231 | Gunsan public wastewater treatment plant impurity treatment machine purchase and replacement work | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2023.04 |
| 252 | 군산공공하수처리장 1차침전지 악취방지시설 설치 기계설비공사(탈취기) | 군사시수도사업소 | 군사시 하수처리장 | 2024.05 |
| 253 | 군산공공하수처리장 상반기 탈황기 여재 교체공사 | Gunsan City Waterworks Office | 군사시 하수처리장 | 2024.05 |
| 283 | 군산공장 1,3라인 C/T, B/P 대형집진기 캔버스 구매 | ㈜LX글라스 | Gunsan | 2025.04 |
| 261 | 군산공장 End Crusher & 화학창고 Recycling system 집진기 교체공사 | (주)LX 글라스 | Gunsan | 2024.07 |
| 88 | Gunsan Business Office Concentration Tank Sludge Collector Repair Contract | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2020. 03 |
| 67 | Replacement of fire extinguishing gas desulfurizer at Gunsan office | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2019.11 |
| 107 | Gunsan Business Office Pond Room 2A Pond Discharge Drain Piping Construction | Korea Marine Environment Corporation Gunsan Branch | Korea Marine Environment Corporation | 2020. 08 |
| 272 | 군산시 폐기물매립장 세차시설 유수분리조 설치공사 | Gunsan City Hall | Gunsan | 2024.12 |
| 213 | Gunsan wastewater treatment plant separation membrane replacement and cleaning work | Gunsan City Waterworks Office | Gunsan Wastewater Treatment Plant | 2022.11 |
| 258 | 군산하수사업소 관리동 지하 저수조 교체 | 리뉴어스주식회사 | 군산시 하수처리장 | 2024.06 |
| 263 | 군산하수사업소 농축조 슬러지 토출배관 보수 | 리뉴어스(주) | Gunsan | 2024.09 |
| 257 | 군산하수사업소 탈수동 지하 공정수펌프 도출배관 수선 | 리뉴어스주식회사 | 군산시 하수처리장 | 2024.06 |
| 275 | 군산하수종말처리장 최종침전조 비계설치 | 리뉴어스주식회사 | Gunsan | 2025.01 |
| 108 | Gunsan Port pollutant storage facility chemical sludge tank replacement work | Gunsan Regional Maritime Affairs and Fisheries Office | Gunsan Port | 2020. 08 |
| 161 | Geumam Village Sewage Treatment Plant Repair Work | Techcross Environmental Service Co., Ltd. | Geumam Village Sewage Treatment Plant | 2021.12 |
| 102 | Mechanical equipment construction | Deokyu Engineering Co., Ltd. | Deokyu Engineering Co., Ltd. | 2020. 07 |
| 5 | Nexelon wastewater treatment facility installation work | Econity | Nexelon | 2013. 11 |
| 3 | Nexelon wastewater treatment facility installation work | Econity | Nexelon | 2013. 10 |
| 72 | Agricultural Life Center restaurant cooling and heating system installation work | National Youth Training Center | National Youth Training Center | 2019. 12 |
| 234 | Concentrate chemical injection facility repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.05 |
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