| 135 | Centrifugal force dust collection facility installation work (200㎥/min) | Seung Oud | Seung Oud | 2021.05 |
| 134 | Filtration dust collection facility installation work (300㎥/min) | Daishin Renewable Industry | Daishin Renewable Industry | 2021.05 |
| 133 | Ultramembrane cleaning work | Gunsan Wastewater Terminal Treatment Plant | Gunsan Wastewater Terminal Treatment Plant | 2021.05 |
| 132 | Filtration dust collection facility installation work (150㎥/min) | GS Metal | GS Metal | 2021.04 |
| 131 | Cleaning dust collection facility installation work (250㎥/min) | Sungjin Polymer Co., Ltd. | Sungjin Polymer Co., Ltd. | 2021.04 |
| 130 | Centrifugal force dust collection equipment installation work (180㎥/min) | Good wood | Good wood | 2021.04 |
| 129 | Centrifugal force dust collection equipment installation work (250㎥/min) | Taejin Wood Co., Ltd. | Taejin Wood Co., Ltd. | 2021.04 |
| 128 | Centrifugal dust collector installation work (250㎥/min) | Baeksan Wood | Baeksan Wood | 2021.03 |
| 127 | Centrifugal dust collector installation work (250㎥/min) | Haesung Timber Co., Ltd. | Haesung Timber Co., Ltd. | 2021.03 |
| 126 | Centrifugal force dust collector installation work (300㎥/min) | Taesung Wood Co., Ltd. | Taesung Wood Co., Ltd. | 2021.03 |
| 125 | Centrifugal dust collector installation work (500㎥/min) | DS Timber Co., Ltd. | DS Timber Co., Ltd. | 2021.03 |
| 124 | Post-treatment bag filter replacement work and duct chamber cleaning | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2021.03 |
| 123 | Gunsan Industrial Complex 2 wastewater site separation membrane (B series) cleaning | Daehyun E&S | Gunsan Wastewater Treatment Plant | 2021. 03 |
| 122 | Mechanical installation work during structural construction (other existing facility improvement work) | Techcross Environmental Service | Daegu food waste treatment plant | 2021.02 |
| 121 | Chemical piping during dredging and cleaning of Daegu food processing facility | Techcross Environmental Service | Daegu city | 2021.02 |
| 120 | Chemical pump installation service | Minseong Industry | Minseong Industry | 2021.01 |
| 119 | Environmental consulting service | Korea Best Environment | Korea Best Environment | 2021.01 |
| 118 | Air emission facility installation report rental service | Taechang Bio Co., Ltd. | Taechang Bio Co., Ltd. | 2021. 01 |
| 117 | Wastewater treatment plant management service | Deoksan Medical Foundation, a medical corporation | Deoksan Medical Foundation, a medical corporation | 2021.01 |
| 116 | Dust collector manufacturing and installation work | Cheongsong E&T Co., Ltd. | Cheongsong E&T Co., Ltd. | 2020.12 |
| 115 | Eoeun Sewage Treatment Plant Repair Work | Techcross Environmental Service | Eoeun Sewage Treatment Plant | 2020.12 |
| 114 | Deodorizer desulfurization media replacement work | Techcross Environmental Service | Gunsan Sewage Treatment Plant | 2020.11 |
| 113 | Fine dust filtration BOOTH production and installation | KoreaTBM | KoreaTBM | 2020.10 |
| 112 | Manufacturing and installation of chemical cleaning deodorizer for 1st relay pump station | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2020.09 |
| 111 | Pond room safety ladder installation | Korea Marine Environment Corporation Gunsan Branch | Korea Marine Environment Corporation | 2020. 09 |
| 110 | Wastewater treatment plant discharge tank level sensor | Jeollabuk-do Gunsan Medical Center | Jeollabuk-do Gunsan Medical Center | 2020.08 |
| 109 | Production and delivery of discharge device frame to Munyeodo Small Sewage Treatment Plant | Sangwon E&C Co., Ltd. | Shaman Island | 2020. 08 |
| 108 | Gunsan Port pollutant storage facility chemical sludge tank replacement work | Gunsan Regional Maritime Affairs and Fisheries Office | Gunsan Port | 2020. 08 |
| 107 | Gunsan Business Office Pond Room 2A Pond Discharge Drain Piping Construction | Korea Marine Environment Corporation Gunsan Branch | Korea Marine Environment Corporation | 2020. 08 |
| 106 | Production and installation of loading table | Shinhwa Environmental Industry | Shinhwa Environmental Industry | 2020.07 |
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