| 211 | Atmosphere prevention facility installation work | Mido Co., Ltd. | Mido Co., Ltd. | 2022.10 |
| 218 | Wastewater treatment plant agitator installation work | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 2022.11 |
| 217 | Concentration tank, dewatering tank piping repair work | Techcross Environmental Services Co., Ltd. | Techcross Environmental Services Co., Ltd. | 2022.11 |
| 216 | Cleaning dust collector and filter dust collector improvement work (12 sets) | Korea Glass Industry Co., Ltd. | Korea Glass Industry Co., Ltd. | 2022.11 |
| 215 | Post-treatment dust collector new diaphragm valve installation work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2022.11 |
| 214 | Borax dust collector duct repair and cleaning work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2022.11 |
| 213 | Gunsan wastewater treatment plant separation membrane replacement and cleaning work | Gunsan City Waterworks Office | Gunsan Wastewater Treatment Plant | 2022.11 |
| 221 | Air-gun hood manufacturing and installation | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2022.12 |
| 220 | Waterworks facility electric valve replacement work | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2022.12 |
| 219 | Public wastewater treatment plant expansion treatment plant separation membrane cleaning service | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2022.12 |
| 202 | Air and wastewater licensing service/magnetic pump installation | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 202208 |
| 224 | Adsorption tower dust collector installation work | Mido Co., Ltd. | Mido Co., Ltd. | 2023.01 |
| 223 | Demister replacement work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2023.01 |
| 222 | Report of installation of 1 case including air emission facility | Ganong Limited, an agricultural corporation | Ganong Limited, an agricultural corporation | 2023.01 |
| 226 | White filter and diaphragm valve replacement work | Dabok Metal Co., Ltd. | Dabok Metal Co., Ltd. | 2023.02 |
| 225 | Adsorption tower installation work | GK Bendings Co., Ltd. | GK Bendings Co., Ltd. | 2023.02 |
| 227 | White filter installation work (1200㎥/min*2set, 650㎥/min*4set) | Korea Glass Industry Co., Ltd. | Korea Glass Industry Co., Ltd. | 2023.03 |
| 231 | Gunsan public wastewater treatment plant impurity treatment machine purchase and replacement work | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2023.04 |
| 230 | Waste landfill preliminary collection tank piping installation | Gunsan City Hall | Gunsan | 2023.04 |
| 229 | Partial replacement of condensate piping in assembly plant, replacement of industrial header in starting room, steam piping insulation in body shop | Tata Daewoo Commercial Vehicle Co., Ltd. | Tata Daewoo Commercial Vehicle Co., Ltd. | 2023.04 |
| 228 | Oil mist dust collector installation work (200㎥/min*5 sets) | Mando Mexico Corporation | Mando Mexico Co., Ltd. | 2023.04 |
| 234 | Concentrate chemical injection facility repair work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.05 |
| 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 |
| 235 | Wastewater treatment facility installation work | Baekgwang IST | Baekgwang IST | 2023.08 |
| 236 | Wastewater treatment plant tank and piping improvement work | Hanwha Q CELLS Jincheon | Hanwha Q CELLS Jincheon | 2023.09 |
| 239 | Final settler sludge collector repair contract | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.11 |
| 238 | Replacement of relay pump deodorizer filter material | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2023.11 |
| 237 | Desulfurization filter media replacement work | Gunsan City Waterworks Office | Gunsan City Waterworks Office | 2023.11 |
| 241 | White filter replacement work | Korea Mold Gimje Co., Ltd. | Korea Mold Gimje Co., Ltd. | 2023.12 |
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