| 278 | 다이아프램밸브 교체공사 | (유)상산개발 | Gunsan | 2025.03 |
| 180 | Air, noise and vibration approval | Baeksan Wood Co., Ltd. | Baeksan Wood Co., Ltd. | 2022.05 |
| 54 | Bag filter installation work | Lucky Environment Co., Ltd. | Lucky Wood | 2019.04 |
| 52 | Bag filter installation work | Lucky Wood Co., Ltd. | Lucky Wood | 2019.02 |
| 183 | Blower maintenance work | DS Timber Co., Ltd. | DS Timber Co., Ltd. | 2022.05 |
| 125 | Centrifugal dust collector installation work (500㎥/min) | DS Timber Co., Ltd. | DS Timber Co., Ltd. | 2021.03 |
| 149 | Environmental approval and permit rental services, etc. | Daeseung Industrial Co., Ltd. | Daeseung Industrial Co., Ltd. | 2021.08 |
| 170 | Other than waiting permit services | Namyang Wood Co., Ltd. | Namyang Wood Co., Ltd. | 2022.02 |
| 65 | Water softening equipment automatic valve replacement work | Hotel Lotte Co., Ltd. Lotte Resort Buyeo | Hotel Lotte Co., Ltd. Lotte Resort Buyeo | 2019.10 |
| 156 | Cullet sorting plant dust collector installation work (700CMM) | Korea Glass Industry Co., Ltd. | Korea Glass Industry Co., Ltd. | 2021.11 |
| 155 | Cullet sorting plant dust collector installation work (1800CMM) | Korea Glass Industry Co., Ltd. | Korea Glass Industry Co., Ltd. | 2021.11 |
| 241 | White filter replacement work | Korea Mold Gimje Co., Ltd. | Korea Mold Gimje Co., Ltd. | 2023.12 |
| 60 | High-concentration deodorization facility reinforcement work | HiNTech Co., Ltd. | Pyeongtaek Wastewater Treatment Plant | 2019. 09 |
| 58 | Installation of automatic polymer dissolution device in the dehydrator room of the second treatment facility | HiNTech Co., Ltd. | Guri Sewage Treatment Plant | 2019. 08 |
| 55 | Conveyor belt cover installation work | HiNTech Co., Ltd. | Gunsan Sewage Treatment Plant | 2019.05 |
| 48 | 12 cases including odor prevention facility repair work | HiNTech Co., Ltd. | Pyeongtaek Godeok Sewage Treatment Plant | 2018. 12 |
| 47 | Installation of manned fan and air supply drain plate at tertiary treatment facility | HiNTech Co., Ltd. | Pyeongtaek Godeok Sewage Treatment Plant | 2018. 11 |
| 39 | Belt conveyor repair | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.07 |
| 38 | Drum screen installation work | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.07 |
| 37 | Performance improvement design and test operation. | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018. 07 |
| 36 | Hyocheon Sewage Treatment Plant Inlet Pipe Installation Work | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018. 04 |
| 35 | Hyocheon Sewage Treatment Plant Tally Filtration Pipe Supplementation Work | HiNTech Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.04 |
| 33 | Performance improvement design and test run thalliac piping work | HiNTech Co., Ltd. | Gwangju Sewage Treatment Plant | 2018. 04 |
| 239 | Final settler sludge collector repair contract | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.11 |
| 238 | Replacement of relay pump deodorizer filter material | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.11 |
| 234 | Concentrate chemical injection facility repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.05 |
| 233 | Silt silt storage hopper repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.05 |
| 232 | Chimshachi waste storage hopper repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.05 |
| 186 | 24Silt chamber impurities skip hoist repair | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2022.05 |
| 179 | Filtered water supply pump joint work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2022.04 |
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