Tai Tam Upper Reservoir
Hong Kong Island · Hong Kong Island · Hong Kong Island catchments
Capacity
1.49 hm³
Coordinates
22.258°N, 114.207°E
Operator
Water Supplies Department (WSD)
94.4% full
Current fill
94.4%vs 7 days ago
0.0%stable
vs 1 year ago
-5.6%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
96%of normal
94.4% full on 2026-10-01, against an average of 97.9% for October across 8 years of readings (-3.5 points).
Rain over the last three months · 21 September 2026
Near normal
In the three months to 21 September 2026 the area around Tai Tam Upper Reservoir had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index +0.38). Rain, not storage. Hong Kong drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 1.49 hm³ |
| Usable capacity | 1.49 hm³ |
| Year built | 1888 |
| Primary use | water supply |
| Operator | Water Supplies Department (WSD) |
| Province | Hong Kong Island |
| Autonomous community | Hong Kong Island |
| River basin | Hong Kong Island catchments |
Satellite imagery: Esri, Maxar, Earthstar Geographics. 22.258, 114.207 · Open in Google Maps
About Tai Tam Upper Reservoir
As of October 1, 2026, Tai Tam Upper Reservoir is filled to 94.4% of its total capacity, holding roughly 1 hm³ of water out of a maximum 1 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 5.6 points below its level on the same date a year earlier.
Across the readings we hold for Tai Tam Upper Reservoir — 184 data points between January 16, 2019 and October 1, 2026 — the level has ranged from a low of 23.7% (May 16, 2025) to a high of 100.0% (June 16, 2019). On average the reservoir is fullest around September and at its lowest around April.
The dam at Tai Tam Upper Reservoir was completed in 1888. It is operated by Water Supplies Department (WSD) primarily for water supply. It lies within the Hong Kong Island catchments basin at 22.258°N, 114.207°E.
Key facts
- Current fill level
- 94.4%
- Water stored
- 1 hm³
- Total capacity
- 1 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 5.6 pts
- Primary use
- Water supply
- River basin
- Hong Kong Island catchments
- Year completed
- 1888
- Operator
- Water Supplies Department (WSD)
- Coordinates
- 22.258°N, 114.207°E
- Last updated
- October 1, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 1 Oct 2026 | 94.4% | 1 |
| 16 Sep 2026 | 100.0% | 1 |
| 1 Sep 2026 | 100.0% | 1 |
| 16 Aug 2026 | 100.0% | 1 |
| 1 Aug 2026 | 100.0% | 1 |
| 16 Jul 2026 | 100.0% | 1 |
| 1 Jul 2026 | 100.0% | 1 |
| 16 Jun 2026 | 92.6% | 1 |
| 1 Jun 2026 | 57.9% | 1 |
| 16 May 2026 | 41.9% | 1 |
| 1 May 2026 | 31.7% | 0 |
| 16 Apr 2026 | 29.5% | 0 |