Santillana
Community of Madrid · Tajo
Capacity
91 hm³
Coordinates
40.725°N, 3.831°W
Operator
CHT
56.0% full
Current fill
56.0%vs 7 days ago
-1.1%losing
vs 1 year ago
-12.1%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
98%of normal
56.0% full on 2026-10-13, against an average of 57.4% for October across 9 years of readings (-1.4 points).
Rain over the last three months · 21 September 2026
Extremely dry
In the three months to 21 September 2026 the area around Santillana had extremely little rain for the season, a shortfall seen about one year in forty. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −2.73). Rain, not storage.
EU drought indicator · 11 September 2026
Warningsoil-moisture deficit
The European Drought Observatory's combined reading of rain, soil moisture and vegetation at this point. Watch means rain has been short, Warning that the soil has dried out, Alert that vegetation is visibly stressed; Recovery means the shortfall is easing. Ground conditions, not the reservoir's storage. Spain drought figures →
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 91 hm³ |
| Usable capacity | 81.9 hm³ |
| Primary use | Multi-purpose |
| Operator | CHT |
| Autonomous community | Community of Madrid |
| River basin | Tajo |
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.725, -3.831 · Open in Google Maps
About Santillana
As of October 13, 2026, Santillana is filled to 56.0% of its total capacity, holding roughly 51 hm³ of water out of a maximum 91 hm³. At this level the reservoir is within its normal operating range. Of that total, about 82 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (-1.1 pts), and it is 12.1 points below its level on the same date a year earlier.
Across the readings we hold for Santillana — 418 data points between October 16, 2018 and October 13, 2026 — the level has ranged from a low of 31.9% (November 12, 2019) to a high of 100.0% (March 25, 2025). On average the reservoir is fullest around April and at its lowest around October.
It is operated by CHT primarily for multiple purposes. It lies within the Tajo basin at 40.725°N, 3.831°W.
Key facts
- Current fill level
- 56.0%
- Water stored
- 51 hm³
- Total capacity
- 91 hm³
- Usable capacity
- 82 hm³
- 7-day change
- ▼ 1.1 pts
- Year-on-year
- ▼ 12.1 pts
- Primary use
- Multipurpose
- River basin
- Tajo
- Operator
- CHT
- Coordinates
- 40.725°N, 3.831°W
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 56.0% | 51 |
| 6 Oct 2026 | 57.1% | 52 |
| 29 Sep 2026 | 58.2% | 53 |
| 22 Sep 2026 | 59.3% | 54 |
| 15 Sep 2026 | 60.4% | 55 |
| 8 Sep 2026 | 62.6% | 57 |
| 1 Sep 2026 | 64.8% | 59 |
| 25 Aug 2026 | 65.9% | 60 |
| 18 Aug 2026 | 68.1% | 62 |
| 11 Aug 2026 | 70.3% | 64 |
| 4 Aug 2026 | 71.4% | 65 |
| 28 Jul 2026 | 73.6% | 67 |