| 61 | Deokam Middle School Main Building Building Faculty Restroom Improvement Mechanical Equipment Construction | Deokam Middle School | Deokam Middle School | 2019.09 |
| 62 | Micro filter housing installation work | Baekje Country Club Co., Ltd. | Baekje Country Club | 2019.09 |
| 63 | Painting work Bag filter canvas replacement work | KHE Co., Ltd. | KHE Co., Ltd. | 2019.10 |
| 64 | Okgu small-scale treatment plant piping repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2019.10 |
| 65 | Water softening equipment automatic valve replacement work | Hotel Lotte Co., Ltd. Lotte Resort Buyeo | Hotel Lotte Co., Ltd. Lotte Resort Buyeo | 2019.10 |
| 66 | Anseong Juksan sewage treatment facility sedimentation tank installation work | Samheung G&G Co., Ltd. | Juksan Sewage Treatment Plant | 2019.10 |
| 67 | Replacement of fire extinguishing gas desulfurizer at Gunsan office | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2019.11 |
| 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 |
| 70 | A/C TOWER repair work | E&S Tech Co., Ltd. | LG Household & Health Care | 2019. 12 |
| 71 | Purchase of Godeok wastewater treatment plant inflow distribution channel bypass piping cover | Pyeongtaek City Hall | Godeok Wastewater Treatment Plant | 2019. 12 |
| 72 | Agricultural Life Center restaurant cooling and heating system installation work | National Youth Training Center | National Youth Training Center | 2019. 12 |
| 73 | Tank PE piping installation work | Xinjiang Enterprise | - | 2019. 12 |
| 74 | Okseo Chongin Facility Filter No. 4 Repair Work | Environmental Facility Management Co., Ltd. | Okseo Sewage Treatment Plant | 2019. 12 |
| 75 | Adsorption tower repair work | Kangsan E&C | Korea Securit | 2019. 12 |
| 76 | E-Land Park Jirisan Namwon micro filter installation work | E-Land Park Co., Ltd. Kensington Resort Jirisan Namwon | E-Land Park Co., Ltd. Jirisan Namwon | 2019. 12 |
| 77 | Production of odor reduction facilities | CP Co., Ltd. | CP | 2019. 12 |
| 78 | Chemical pump valve installation | Handok C&C | Daesang Bio | 2019. 12 |
| 79 | Mechanical installation work (1st phase) during structural construction (other existing facility improvement work) | Techcross Environmental Service Co., Ltd. | Daegu food processing plant | 2019. 12 |
| 80 | Dust collector diaphragm valve replacement work | Sunil Co., Ltd. | Korea Securit | 2020. 01 |
| 81 | Autoclave piping work | Aone Construction Co., Ltd. | Aone Construction Co., Ltd. | 2020. 01 |
| 82 | Chemical tank piping installation | Gyeongjin Industry | Pyeongtaek Wastewater Treatment Plant | 2020. 02 |
| 83 | Chemical tank and pump installation work | Segi Energy Co., Ltd. | Korea Securit | 2020. 02 |
| 84 | RTO duct repair work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2020. 02 |
| 85 | Diaphragm valve | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2020. 02 |
| 86 | Mechanical installation work (2nd phase) during structural construction (other existing facility improvement work) | Techcross Environmental Service Co., Ltd. | Daegu food processing plant | 2020. 03 |
| 87 | Plumbing construction | Segi E.N.G. | Korea Securit | 2020. 03 |
| 88 | Gunsan Business Office Concentration Tank Sludge Collector Repair Contract | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2020. 03 |
| 89 | Concentration tank silt basin fine dust remover repair contract | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2020. 03 |
| 90 | Plumbing work, pump installation | Segi E.N.G. | SeAH Besteel | 2020. 03 |
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