| 91 | Wastewater treatment facility mechanical installation work | Farmers Food Co., Ltd. | farmers food | 2020. 04 |
| 92 | Filter case production and PH sensor delivery | Kangsan E&C | Korea Securit | 2020. 04 |
| 93 | Piping installation work | Segi E.N.G. | SeAH Besteel | 2020. 04 |
| 94 | Sewage treatment plant discharge pump installation | Jeonbuk Gunsan Medical Center | Jeonbuk Gunsan Medical Center | 2020. 05 |
| 95 | Wastewater treatment facility installation work | Minseong Industry | Minseong Industry | 2020. 05 |
| 96 | Installation of odor treatment facility on Munyeo Island, Gunsan | Gunsan City Hall | Munyeo Island Sewage Treatment Plant | 2020. 05 |
| 97 | Installation of odor treatment facility at Gunsan 1 relay pump station | Gunsan City Hall | Gunsan 1st relay pumping station | 2020. 05 |
| 98 | Digestion gas desulfurization machine (M-1052) repair | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2020.06 |
| 99 | Chemical tank installation work | Handok C&C | Handok C&C | 2020. 06 |
| 100 | Daegu Sangri food waste treatment plant improvement project | Techcross Environmental Service Co., Ltd. | Daegu Sangni | 2020. 06 |
| 101 | Diaphragm pump construction | Minseong Industry | Minseong Industry | 2020. 07 |
| 102 | Mechanical equipment construction | Deokyu Engineering Co., Ltd. | Deokyu Engineering Co., Ltd. | 2020. 07 |
| 103 | Chemical piping installation work | Hanil Systems Co., Ltd. | Hanil Systems | 2020. 07 |
| 104 | Chango Village Sewage Treatment Plant Repair Work | Techcross Environmental Service Co., Ltd. | Chango Village | 2020.07 |
| 105 | Chemical tank protective wall installation and piping work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2020. 07 |
| 106 | Production and installation of loading table | Shinhwa Environmental Industry | Shinhwa Environmental Industry | 2020.07 |
| 107 | Gunsan Business Office Pond Room 2A Pond Discharge Drain Piping Construction | Korea Marine Environment Corporation Gunsan Branch | Korea Marine Environment Corporation | 2020. 08 |
| 108 | Gunsan Port pollutant storage facility chemical sludge tank replacement work | Gunsan Regional Maritime Affairs and Fisheries Office | Gunsan Port | 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 |
| 110 | Wastewater treatment plant discharge tank level sensor | Jeollabuk-do Gunsan Medical Center | Jeollabuk-do Gunsan Medical Center | 2020.08 |
| 111 | Pond room safety ladder installation | Korea Marine Environment Corporation Gunsan Branch | Korea Marine Environment Corporation | 2020. 09 |
| 112 | Manufacturing and installation of chemical cleaning deodorizer for 1st relay pump station | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2020.09 |
| 113 | Fine dust filtration BOOTH production and installation | KoreaTBM | KoreaTBM | 2020.10 |
| 114 | Deodorizer desulfurization media replacement work | Techcross Environmental Service | Gunsan Sewage Treatment Plant | 2020.11 |
| 115 | Eoeun Sewage Treatment Plant Repair Work | Techcross Environmental Service | Eoeun Sewage Treatment Plant | 2020.12 |
| 116 | Dust collector manufacturing and installation work | Cheongsong E&T Co., Ltd. | Cheongsong E&T Co., Ltd. | 2020.12 |
| 117 | Wastewater treatment plant management service | Deoksan Medical Foundation, a medical corporation | Deoksan Medical Foundation, a medical corporation | 2021.01 |
| 118 | Air emission facility installation report rental service | Taechang Bio Co., Ltd. | Taechang Bio Co., Ltd. | 2021. 01 |
| 119 | Environmental consulting service | Korea Best Environment | Korea Best Environment | 2021.01 |
| 120 | Chemical pump installation service | Minseong Industry | Minseong Industry | 2021.01 |
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