| 75 | Adsorption tower repair work | Kangsan E&C | Korea Securit | 2019. 12 |
| 74 | Okseo Chongin Facility Filter No. 4 Repair Work | Environmental Facility Management Co., Ltd. | Okseo Sewage Treatment Plant | 2019. 12 |
| 73 | Tank PE piping installation work | Xinjiang Enterprise | - | 2019. 12 |
| 72 | Agricultural Life Center restaurant cooling and heating system installation work | National Youth Training Center | National Youth Training Center | 2019. 12 |
| 71 | Purchase of Godeok wastewater treatment plant inflow distribution channel bypass piping cover | Pyeongtaek City Hall | Godeok Wastewater Treatment Plant | 2019. 12 |
| 70 | A/C TOWER repair work | E&S Tech Co., Ltd. | LG Household & Health Care | 2019. 12 |
| 69 | Cartridge filter dust collector air piping reinforcement work | Iljin Steel Co., Ltd. | Iljin Steel | 2019.11 |
| 68 | Cartridge filter dust collector outlet reinforcement work | Iljin Steel Co., Ltd. | Iljin Steel | 2019.11 |
| 67 | Replacement of fire extinguishing gas desulfurizer at Gunsan office | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2019.11 |
| 66 | Anseong Juksan sewage treatment facility sedimentation tank installation work | Samheung G&G Co., Ltd. | Juksan Sewage Treatment Plant | 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 |
| 64 | Okgu small-scale treatment plant piping repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2019.10 |
| 63 | Painting work Bag filter canvas replacement work | KHE Co., Ltd. | KHE Co., Ltd. | 2019.10 |
| 62 | Micro filter housing installation work | Baekje Country Club Co., Ltd. | Baekje Country Club | 2019.09 |
| 61 | Deokam Middle School Main Building Building Faculty Restroom Improvement Mechanical Equipment Construction | Deokam Middle School | Deokam Middle School | 2019.09 |
| 60 | High-concentration deodorization facility reinforcement work | HiNTech Co., Ltd. | Pyeongtaek Wastewater Treatment Plant | 2019. 09 |
| 59 | Filtration tank installation work | Kangsan E&C | Gunsan Wolmyeong Swimming Pool | 2019.09 |
| 58 | Installation of automatic polymer dissolution device in the dehydrator room of the second treatment facility | HiNTech Co., Ltd. | Guri Sewage Treatment Plant | 2019. 08 |
| 57 | New wastewater treatment plant installation work | farmers food | Jongcheon Agricultural and Industrial Complex | 2019. 06 |
| 56 | Groundwater water treatment system installation work | GNS Engineering | Pocheon military unit | 2019. 05 |
| 55 | Conveyor belt cover installation work | HiNTech Co., Ltd. | Gunsan Sewage Treatment Plant | 2019.05 |
| 54 | Bag filter installation work | Lucky Environment Co., Ltd. | Lucky Wood | 2019.04 |
| 53 | Activated carbon dust collector repair work | Kangsan E&C | Korea Securit Co., Ltd. | 2019. 02 |
| 52 | Bag filter installation work | Lucky Wood Co., Ltd. | Lucky Wood | 2019.02 |
| 51 | Wastewater treatment plant level sensor replacement work | Gunsan Medical Center | Gunsan Medical Center | 2019.01 |
| 50 | HNP Grinding water tank repair work | Securit Co., Ltd. Gunsan | Korea Securit Co., Ltd. | 2019. 01 |
| 49 | Fan balancing and bearing replacement | Korea TV | Pyeongtaek Godeok Sewage Treatment Plant | 2019. 01 |
| 48 | 12 cases including odor prevention facility repair work | HiNTech Co., Ltd. | Pyeongtaek Godeok Sewage Treatment Plant | 2018. 12 |
| 47 | Installation of manned fan and air supply drain plate at tertiary treatment facility | HiNTech Co., Ltd. | Pyeongtaek Godeok Sewage Treatment Plant | 2018. 11 |
| 46 | Manufacturing and installation of iron manganese removal equipment | GNS Engineering | gongju | 2018. 11 |
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