| 104 | Chango Village Sewage Treatment Plant Repair Work | Techcross Environmental Service Co., Ltd. | Chango Village | 2020.07 |
| 46 | Manufacturing and installation of iron manganese removal equipment | GNS Engineering | gongju | 2018. 11 |
| 239 | Final settler sludge collector repair contract | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.11 |
| 181 | Measuring tool improvement work | Tata Daewoo Commercial Vehicles Ltd. | Tata Daewoo Commercial Vehicles Ltd. | 2022.05 |
| 246 | 침사&협잡물 호퍼 보수공사 | Techcross Environmental Services Co., Ltd. | Techcross Environmental Services Co., Ltd. | 2024.03 |
| 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 |
| 18 | Sedimentation tank scraper installation work | farmers food | farmers food | 2015. 04 |
| 68 | Cartridge filter dust collector outlet reinforcement work | Iljin Steel Co., Ltd. | Iljin Steel | 2019.11 |
| 69 | Cartridge filter dust collector air piping reinforcement work | Iljin Steel Co., Ltd. | Iljin Steel | 2019.11 |
| 55 | Conveyor belt cover installation work | HiNTech Co., Ltd. | Gunsan Sewage Treatment Plant | 2019.05 |
| 17 | Dehydrator repair and enrichment tank repair work | farmers food | farmers food | 2015. 03 |
| 114 | Deodorizer desulfurization media replacement work | Techcross Environmental Service | Gunsan Sewage Treatment Plant | 2020.11 |
| 237 | Desulfurization filter media replacement work | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2023.11 |
| 34 | Desulfurizer replacement and piping work | ATE Co., Ltd. | Gunsan Sewage Treatment Plant | 2018. 04 |
| 73 | Tank PE piping installation work | Xinjiang Enterprise | - | 2019. 12 |
| 155 | Cullet sorting plant dust collector installation work (1800CMM) | Korea Glass Industry Co., Ltd. | Korea Glass Industry Co., Ltd. | 2021.11 |
| 156 | Cullet sorting plant dust collector installation work (700CMM) | Korea Glass Industry Co., Ltd. | Korea Glass Industry Co., Ltd. | 2021.11 |
| 196 | Pipe cutting fume dust collector installation work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2022.07 |
| 49 | Fan balancing and bearing replacement | Korea TV | Pyeongtaek Godeok Sewage Treatment Plant | 2019. 01 |
| 145 | Pen Balancing and Bearing Replacement | Korea TV Co., Ltd. | Korea TV Co., Ltd. | 2021.07 |
| 230 | Waste landfill preliminary collection tank piping installation | Gunsan City Hall | Gunsan | 2023.04 |
| 210 | Waste change permit service | Bogwang Industry Co., Ltd. | Bogwang Industry Co., Ltd. | 2022.09 |
| 139 | Wastewater discharge facility reporting rental service | Dongwoo Farm to Table Co., Ltd. | Dongwoo Farm to Table Co., Ltd. | 2021.06 |
| 91 | Wastewater treatment facility mechanical installation work | Farmers Food Co., Ltd. | farmers food | 2020. 04 |
| 16 | Wastewater treatment facility repair work | Kimjangdok | Kimjangdok | 2015. 02 |
| 7 | Wastewater treatment facility repair work | farmers food | farmers food | 2014. 06 |
| 6 | Wastewater treatment facility repair work | farmers food | farmers food | 2013. 12 |
| 1 | Wastewater treatment facility repair work | Kimjangdok | Kimjangdok | 2013.07 |
| 235 | Wastewater treatment facility installation work | Baekgwang IST | Baekgwang IST | 2023.08 |
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