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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Toa Vaca

Villalba

Safety

147.26m

483.14 ft

0.26 m above Observation

Data as of August 23, 2026 · Reading taken at 5:00 AM

Compared with normal

0.35 m above normal for this date

A ±7-day window around August 23, 2026, this reservoir's own most recent reading.

Percentile 52 across 28 years of record.

Rank 211 of 406 readings from these dates. Rank 1 is the lowest.

The rank counts individual readings, not years.

Most recent year lower on this date: 2025.

Median
146.91 m
Minimum
19.40 m2001
Maximum
164.02 m2011
90th percentile
157.25 m

Level over time

Resolution follows the range: daily up to a year, weekly at five years, monthly across the whole record.

Toa Vaca: level from July 25, 2026 to August 23, 2026, a net fall of 0.64 m.

August 23, 2026: 147.26 m.

Hover the chart or use the arrow keys to read a point.

From July 25, 2026 to August 23, 2026. Minimum 147.26 m, maximum 147.90 m.

The vertical scale runs from 147.20 m to 148.00 m and does not start at zero: these are metres above sea level.

5 bounds fall outside this chart’s scale.

Toa Vaca: level from July 25, 2026 to August 23, 2026, a net fall of 0.64 m.
Datem
July 25, 2026147.90
July 26, 2026147.87
July 27, 2026147.86
July 28, 2026147.83
July 29, 2026147.81
July 30, 2026147.79
July 31, 2026147.76
August 1, 2026147.74
August 2, 2026147.72
August 3, 2026147.69
August 4, 2026147.67
August 5, 2026147.65
August 6, 2026147.62
August 7, 2026147.59
August 8, 2026147.57
August 9, 2026147.55
August 10, 2026147.53
August 11, 2026147.50
August 12, 2026147.49
August 13, 2026147.48
August 14, 2026147.47
August 15, 2026147.44
August 16, 2026147.42
August 17, 2026147.40
August 18, 2026147.38
August 19, 2026147.35
August 20, 2026147.33
August 21, 2026147.31
August 22, 2026147.29
August 23, 2026147.26

Projection

Disabled

This portal does not publish projections yet. Saying when a reservoir would reach its next phase is a claim about the future of a great many people's water, and before publishing one we want the rule for when it may and may not be made written down.

Every August 23 in the record

Compare another date

Hover the dots or use the arrow keys.

14 years of the 28 with a reading on August 23 were below the most recent level.

From 1997 to 2026.

The dashed line is this reservoir’s most recent level: 147.26 m on August 23, 2026.

The vertical scale runs from 0.00 m to 200.00 m and does not start at zero: these are metres above sea level.

Years with no reading on this date are not in the record and are left as empty space on the axis.

Years below the most recent level are marked with a filled dot.

This counts years. The rank in the block above counts readings.

14 years of the 28 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
199727.15
199830.27
199932.54
200028.50
200119.95
200228.74
200433.23
2005158.74
2006155.88
2007153.59
2008151.66
2009153.07
2010155.70
2011163.08
2012157.19
2014141.94
2015144.95
2016145.35
2017148.07
2018153.98
2019144.95
2020147.01
2021148.54
2022140.81
2023156.54
2024154.47
2025146.83
2026147.26

When it has been in each phase

Hover the bands or use the arrow keys.

Each band is one run in one phase, since January 1, 2020.

The axis is calendar time, from January 1, 2020 to August 23, 2026. Stretches with no bulletin are left blank.

Current run

303 days in Safety, since October 25, 2025.

The longest run in Safety on record: 2,229 days, from April 22, 2005 to August 23, 2011.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020July 24, 2020206
ObservationJuly 25, 2020July 30, 20206
SafetyJuly 31, 2020August 10, 202011
ObservationAugust 11, 2020August 22, 202012
SafetyAugust 23, 2020August 25, 20203
ObservationAugust 26, 2020October 20, 202056
SafetyOctober 21, 2020January 28, 2022465
ObservationJanuary 29, 2022September 18, 2022233
SafetySeptember 19, 2022August 11, 20251050
ObservationAugust 12, 2025October 24, 202574
SafetyOctober 25, 2025August 23, 2026303

How we read the data

Every figure on this portal is the 5:00 AM AST reading from the USGS gauge, every day, at every reservoir. AAA's daily bulletin is drawn at 4:55 AM and carries the freshest reading that had arrived by press time; the gauges transmit once an hour, and the 5:00 AM reading is published around 5:57 AM. On days when levels move quickly the two figures can therefore differ by about a centimetre. Each is correct for its own cut-off. Ours holds the same 24-hour interval every day, which is what makes our day-over-day changes directly comparable to one another.

We read the same USGS gauges that underpin the bulletin. The alert phases (Overflow, Safety, Observation, Operational adjustments, Control) are the thresholds AAA publishes for each reservoir; AAA prints them in Spanish, as Desborde, Seguridad, Observación, Ajustes and Control.

Source

Data: U.S. Geological Survey (USGS)

Provisional data

Provisional data: values are preliminary, have not been reviewed or approved by the U.S. Geological Survey, and are subject to revision or removal as the record is finalized. Do not use them for decisions involving personal or public safety, or property.

Daily reservoir level bulletin: Autoridad de Acueductos y Alcantarillados de Puerto Rico.

This portal is not an official channel of the Autoridad de Acueductos y Alcantarillados. For service notices, consult AAA.