| 45 | Chemical tank installation and plumbing work | Samho Chemssana Co., Ltd. | Samho Chemssana Co., Ltd. | 2018. 11 |
| 44 | Production and delivery of wastewater treatment plant | HNTech Co., Ltd. | HNTech Co., Ltd. | 2018. 11 |
| 43 | Scrava manufacturing and installation work | Hanmi Tech | Gunsan Sewage Treatment Plant | 2018. 11 |
| 42 | Weight system-related piping modification work | Securit Co., Ltd. Gunsan | Korea Securit Co., Ltd. | 2018.09 |
| 41 | Plating factory hydrochloric acid diffusion prevention facility installation work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 07 |
| 40 | Sulfuric acid transfer pump installation and piping work | J&HC Co., Ltd. | Hyocheon Sewage Treatment Plant | 2018.07 |
| 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 |
| 34 | Desulfurizer replacement and piping work | ATE Co., Ltd. | Gunsan Sewage Treatment Plant | 2018. 04 |
| 33 | Performance improvement design and test run thalliac piping work | HiNTech Co., Ltd. | Gwangju Sewage Treatment Plant | 2018. 04 |
| 32 | Plating plant absorption tower (sclava) repair work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 04 |
| 31 | Manufacturing and installation of backwash equipment | GNS Engineering | Gongju | 2018.02 |
| 30 | Dust collector relocation and DUCT installation work | Dasan Qigong | Dasan Qigong | 2015.12 |
| 29 | Cyclone production | Daeil E&C | Daeil E&C | 2015.12 |
| 28 | Filter installation work | Korea Marine Environment Management Corporation Gunsan Branch | Korea Marine Environment Management Corporation Gunsan Branch | 2015.12 |
| 27 | Bag filter and short equipment repair work | Korea TV | Korea TV | 2015.12 |
| 26 | Manufacturing and installation of multi-layer filter | Jeonbuk Innovation City Water Quality Restoration Center | Jeonbuk Innovation City Water Quality Restoration Center | 2015.10 |
| 25 | Diaphragm valve replacement | Korea Mold | Korea Mold | 2015.09 |
| 24 | Blower motor replacement and pulley manufacturing | Korea Mold | Korea Mold | 2015. 09 |
| 23 | Village sewage treatment facility expansion construction | Econity | Yeongdong-gun | 2015. 09 |
| 22 | Inflow flow meter installation work | Securit Co., Ltd. Gunsan | Securit Co., Ltd. | 2015. 08 |
| 21 | Micro filter piping repair work | Securit Co., Ltd. Gunsan | Securit Co., Ltd. | 2015. 07 |
| 20 | Ph meter sensor installation | Securit Co., Ltd. Gunsan | Securit Co., Ltd. | 2015. 06 |
| 19 | Chemical tank installation and FRP lining | Dio Electronics | Dio Electronics | 2015. 04 |
| 18 | Sedimentation tank scraper installation work | farmers food | farmers food | 2015. 04 |
| 17 | Dehydrator repair and enrichment tank repair work | farmers food | farmers food | 2015. 03 |
| 16 | Wastewater treatment facility repair work | Kimjangdok | Kimjangdok | 2015. 02 |
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