| 89 | Concentration tank silt basin fine dust remover repair contract | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2020. 03 |
| 217 | Concentration tank, dewatering tank piping repair work | Techcross Environmental Services Co., Ltd. | Techcross Environmental Services Co., Ltd. | 2022.11 |
| 101 | Diaphragm pump construction | Minseong Industry | Minseong Industry | 2020. 07 |
| 85 | Diaphragm valve | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2020. 02 |
| 25 | Diaphragm valve replacement | Korea Mold | Korea Mold | 2015.09 |
| 278 | 다이아프램밸브 교체공사 | (유)상산개발 | Gunsan | 2025.03 |
| 26 | Manufacturing and installation of multi-layer filter | Jeonbuk Innovation City Water Quality Restoration Center | Jeonbuk Innovation City Water Quality Restoration Center | 2015.10 |
| 100 | Daegu Sangri food waste treatment plant improvement project | Techcross Environmental Service Co., Ltd. | Daegu Sangni | 2020. 06 |
| 121 | Chemical piping during dredging and cleaning of Daegu food processing facility | Techcross Environmental Service | Daegu city | 2021.02 |
| 194 | In addition to reporting the start of operation of air and wastewater | Yusu Industry Co., Ltd. | Yusu Industry Co., Ltd. | 2022.07 |
| 195 | Air and wastewater change report permit service | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 2022.07 |
| 202 | Air and wastewater licensing service/magnetic pump installation | Dio Electronics Co., Ltd. | Dio Electronics Co., Ltd. | 202208 |
| 180 | Air, noise and vibration approval | Baeksan Wood Co., Ltd. | Baeksan Wood Co., Ltd. | 2022.05 |
| 211 | Atmosphere prevention facility installation work | Mido Co., Ltd. | Mido Co., Ltd. | 2022.10 |
| 274 | Air emission facility installation report rental service | (주)해성푸드원 | 서천 | 2025.01 |
| 118 | Air emission facility installation report rental service | Taechang Bio Co., Ltd. | Taechang Bio Co., Ltd. | 2021. 01 |
| 276 | 대기배출시설 인허가 대관용역 | (주)오미아코리아 | (주)오미아코리아 | 2025.02 |
| 222 | Report of installation of 1 case including air emission facility | Ganong Limited, an agricultural corporation | Ganong Limited, an agricultural corporation | 2023.01 |
| 166 | Waiting permit rental service (Plant 1, Factory 2) | K-Net Co., Ltd. | K-Net Co., Ltd. | 2022.01 |
| 165 | Other than waiting permit rental service | Wooshin Pigment Co., Ltd. Iksan Branch | Wooshin Pigment Co., Ltd. Iksan Branch | 2022.01 |
| 182 | Waiting permit service | Cheongsong Timber | Cheongsong Timber | 2022.05 |
| 171 | Waiting permit service | SA Tech Co., Ltd. | SA Tech Co., Ltd. | 2022.02 |
| 170 | Other than waiting permit services | Namyang Wood Co., Ltd. | Namyang Wood Co., Ltd. | 2022.02 |
| 169 | Other than waiting permit services | Dasan Wood | Dasan Wood | 2022.02 |
| 61 | Deokam Middle School Main Building Building Faculty Restroom Improvement Mechanical Equipment Construction | Deokam Middle School | Deokam Middle School | 2019.09 |
| 172 | Duct installation work | 3AC Jeongeup Factory | 3AC Jeongeup Factory | 2022.03 |
| 223 | Demister replacement work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2023.01 |
| 41 | Plating factory hydrochloric acid diffusion prevention facility installation work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 07 |
| 32 | Plating plant absorption tower (sclava) repair work | KHE Co., Ltd. | KHE Co., Ltd. | 2018. 04 |
| 63 | Painting work Bag filter canvas replacement work | KHE Co., Ltd. | KHE Co., Ltd. | 2019.10 |
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