| 1 | Public Works Department | #2503 | |
| 2 | Civil Engineering Section | #2600、#2601、#2603 | hchgr101@hchg.gov.tw |
| 3 | Maintenance Section | #2560、#2561、#2562 | hchgr201@hchg.gov.tw |
| 4 | Sewage Section | #2620、#2621、#2622 | hchgr301@hchg.gov.tw |
| 5 | Building Administration Section | #2530、#2531、#2532 | hchgr501@hchg.gov.tw |
| 6 | Engineering Section | #2650、#2652、#2653 | hchgr601@hchg.gov.tw |
| 7 | Building Permit and Inspection Section | #6350、#6351、#6352 | hchgr701@hchg.gov.tw |
| 8 | Water Resources Section | #6310、#6311、#6312 | hchgr801@hchg.gov.tw |