| 95 | Wastewater treatment facility installation work | Minseong Industry | Minseong Industry | 2020. 05 |
| 2 | Wastewater treatment facility installation work | Hyeseong Hospital | Hyeseong Hospital | 2013. 10 |
| 281 | 폐수처리시설 운영관리 도급 | 타타대우모빌리티(주) | Gunsan | 2025.04 |
| 117 | Wastewater treatment plant management service | Deoksan Medical Foundation, a medical corporation | Deoksan Medical Foundation, a medical corporation | 2021.01 |
| 218 | Wastewater treatment plant agitator installation work | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 2022.11 |
| 184 | Wastewater treatment plant agitator installation work | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 2022.05 |
| 51 | Wastewater treatment plant level sensor replacement work | Gunsan Medical Center | Gunsan Medical Center | 2019.01 |
| 264 | 폐수처리장 메탄올 TANK 방지시설 설치 | 한화솔루션(주)진천사업장 | 충북 진천 | 2024.09 |
| 110 | Wastewater treatment plant discharge tank level sensor | Jeollabuk-do Gunsan Medical Center | Jeollabuk-do Gunsan Medical Center | 2020.08 |
| 185 | Wastewater treatment plant repair work | Dasong Kister Co., Ltd. | Dasong Kister Co., Ltd. | 2022.05 |
| 148 | Wastewater treatment plant repair work | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 2021.08 |
| 266 | 폐수처리장 보완공사 (배관) | 한화솔루션(주)진천사업장 | 충북 진천 | 2024.10 |
| 269 | 폐수처리장 설비 공사 | Tata Daewoo Commercial Vehicle Co., Ltd. | Gunsan | 2024.11 |
| 150 | Wastewater treatment plant installation work (150 tons/day) | Daewoo Engineering & Construction | Iljuk Sewage Treatment Plant | 2021.09 |
| 236 | Wastewater treatment plant tank and piping improvement work | Hanwha Q CELLS Jincheon | Hanwha Q CELLS Jincheon | 2023.09 |
| 280 | 폐수처리장 여과기 여과사 교체공사 | 솔베이실리카코리아 | Gunsan | 2025.04 |
| 282 | 폐수처리장 폭기조 산기관 교체공사 | ㈜농협목우촌 김제육가공공장 | 김제 | 2025.04 |
| 240 | Wastewater treatment equipment capacity-up construction | Hanwha Q CELLS Jincheon | Hanwha Q CELLS Jincheon | 2023.12 |
| 44 | Production and delivery of wastewater treatment plant | HNTech Co., Ltd. | HNTech Co., Ltd. | 2018. 11 |
| 192 | Waste super refrigerant coagulation reaction tank FRP coating, etc. | Dasong Kister Co., Ltd. | Dasong Kister Co., Ltd. | 2022.06 |
| 111 | Pond room safety ladder installation | Korea Marine Environment Corporation Gunsan Branch | Korea Marine Environment Corporation | 2020. 09 |
| 92 | Filter case production and PH sensor delivery | Kangsan E&C | Korea Securit | 2020. 04 |
| 251 | 하수처리장 송풍기 (터보브로워) 납품 | Gunsan City Hall | 군산시 하수처리장 | 2024.04 |
| 249 | 하수처리장 악취방지시설공사(탈취기) | Gunsan City Hall | 군산시 하수처리장 | 2024.04 |
| 133 | Ultramembrane cleaning work | Gunsan Wastewater Terminal Treatment Plant | Gunsan Wastewater Terminal Treatment Plant | 2021.05 |
| 119 | Environmental consulting service | Korea Best Environment | Korea Best Environment | 2021.01 |
| 285 | 환경기초시설 통합환경허가 변경 용역 | 고창군청 | 고창 | 2025.04 |
| 247 | 환경인허가 | 의료법인 대산의료재단 | 익산병원 | 2024.03 |
| 149 | Environmental approval and permit rental services, etc. | Daeseung Industrial Co., Ltd. | Daeseung Industrial Co., Ltd. | 2021.08 |
| 198 | Activated carbon and filter replacement | Woosuk Engineering Co., Ltd. | Woosuk Engineering Co., Ltd. | 2022.07 |
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