| 98 | Digestion gas desulfurization machine (M-1052) repair | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2020.06 |
| 103 | Chemical piping installation work | Hanil Systems Co., Ltd. | Hanil Systems | 2020. 07 |
| 73 | Tank PE piping installation work | Xinjiang Enterprise | - | 2019. 12 |
| 217 | Concentration tank, dewatering tank piping repair work | Techcross Environmental Services Co., Ltd. | Techcross Environmental Services Co., Ltd. | 2022.11 |
| 127 | Centrifugal dust collector installation work (250㎥/min) | Haesung Timber Co., Ltd. | Haesung Timber Co., Ltd. | 2021.03 |
| 63 | Painting work Bag filter canvas replacement work | KHE Co., Ltd. | KHE Co., Ltd. | 2019.10 |
| 41 | Plating factory hydrochloric acid diffusion prevention facility installation work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 07 |
| 32 | Plating plant absorption tower (sclava) repair work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 04 |
| 226 | White filter and diaphragm valve replacement work | Dabok Metal Co., Ltd. | Dabok Metal Co., Ltd. | 2023.02 |
| 185 | Wastewater treatment plant repair work | Dasong Kister Co., Ltd. | Dasong Kister Co., Ltd. | 2022.05 |
| 154 | Exempt facility measurement tool installation work | Dongwoo Farm to Table Co., Ltd. | Dongwoo Farm to Table Co., Ltd. | 2021.11 |
| 139 | Wastewater discharge facility reporting rental service | Dongwoo Farm to Table Co., Ltd. | Dongwoo Farm to Table Co., Ltd. | 2021.06 |
| 228 | Oil mist dust collector installation work (200㎥/min*5 sets) | Mando Mexico Corporation | Mando Mexico Co., Ltd. | 2023.04 |
| 211 | Atmosphere prevention facility installation work | Mido Co., Ltd. | Mido Co., Ltd. | 2022.10 |
| 143 | Production and installation of local ventilation facilities for the grinding process | Sangwon IML Co., Ltd. | Sangwon IML Co., Ltd. | 2021.07 |
| 131 | Cleaning dust collection facility installation work (250㎥/min) | Sungjin Polymer Co., Ltd. | Sungjin Polymer Co., Ltd. | 2021.04 |
| 153 | Blower balancing & bearing and belt replacement | 3AC Co., Ltd. | 3AC Co., Ltd. | 2021.10 |
| 172 | Duct installation work | 3AC Jeongeup Factory | 3AC Jeongeup Factory | 2022.03 |
| 171 | Waiting permit service | SA Tech Co., Ltd. | SA Tech Co., Ltd. | 2022.02 |
| 81 | Autoclave piping work | Aone Construction Co., Ltd. | Aone Construction Co., Ltd. | 2020. 01 |
| 44 | Production and delivery of wastewater treatment plant | HNTech Co., Ltd. | HNTech Co., Ltd. | 2018. 11 |
| 151 | Air dryer installation work | Woosuk Engineering Co., Ltd. | Woosuk Engineering Co., Ltd. | 2021.09 |
| 165 | Other than waiting permit rental service | Wooshin Pigment Co., Ltd. Iksan Branch | Wooshin Pigment Co., Ltd. Iksan Branch | 2022.01 |
| 76 | E-Land Park Jirisan Namwon micro filter installation work | E-Land Park Co., Ltd. Kensington Resort Jirisan Namwon | E-Land Park Co., Ltd. Jirisan Namwon | 2019. 12 |
| 225 | Adsorption tower installation work | GK Bendings Co., Ltd. | GK Bendings Co., Ltd. | 2023.02 |
| 116 | Dust collector manufacturing and installation work | Cheongsong E&T Co., Ltd. | Cheongsong E&T Co., Ltd. | 2020.12 |
| 158 | Repair of bioreactor alum input equipment | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2021.11 |
| 146 | Digester B series concentrated sludge supply pipe replacement | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2021.08 |
| 105 | Chemical tank protective wall installation and piping work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2020. 07 |
| 64 | Okgu small-scale treatment plant piping repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2019.10 |
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