| Director’s office | 04-23304788 | 1203 | 04-23300190 |
| Deputy director’s office | 04-23304788 | 1204 | 04-23300190 |
| Drainage Division | 04-23304788 | 2227 | 04-23303019 |
| Drainage Division Jiuzheng office | 04-23304788 | 2227 | 04-23303019 |
| Drainage Division Chiding office | 037-584514 | 5111 | 037-584514
|
| River And Coast Planning Section | 04-23304788 | 2352 | 04-23308781 |
| River And Coast Planning Section Jiuzheng office | 04-23304788 | 2352 | 04-23323523 |
| River And Coast Planning Section Miaoli office | 037-322675 | | 037-328927 |
| River And Coast Planning Section Chiding office | 037-586315 | | 037-585019 |
| River And Coast Planning Section Tainan office | 06-2543172 | | 06-2547066 |
| Water Resources Planning Section | 04-23304788 | 1356 | 04-23308781 |
| Water Resources Planning Section Changhua Office | 047-628741 | 3112 | 047-619021 |
| Hydro & Geo-Tech Experimentation | 04-23304788 | 1356 | 04-23308781 |
| Hydro & Geo-Tech Experimentation Jiuzheng office | 04-23331001 | 2101 | 04-23393147 |
| Technology Development Section | 04-23304788 | 1311 | 04-23322535 |
| Secretarial Office | 04-23304788 | 1132 | 04-23300282 |
| Personal Office | 04-23304788 | 1102 | 04-23300439 |
| Ethics Office | 04-23304788 | 1112 | 04-23301740 |
| Accounting Office | 04-23304788 | 1217 | 04-23322531 |