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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Cerrillos

Ponce

Safety

167.54m

549.68 ft

6.64 m above Observation

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

Compared with normal

2.48 m below normal for this date

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

Percentile 41 across 32 years of record.

Rank 184 of 451 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
170.02 m
Minimum
3.39 m1991
Maximum
176.01 m1998
90th percentile
173.80 m

Level over time

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

Cerrillos: level from July 25, 2026 to August 23, 2026, a net fall of 1.44 m.

August 23, 2026: 167.54 m.

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

From July 25, 2026 to August 23, 2026. Minimum 167.54 m, maximum 168.98 m.

The vertical scale runs from 167.50 m to 169.00 m and does not start at zero: these are metres above sea level.

5 bounds fall outside this chart’s scale.

Cerrillos: level from July 25, 2026 to August 23, 2026, a net fall of 1.44 m.
Datem
July 25, 2026168.98
July 26, 2026168.93
July 27, 2026168.87
July 28, 2026168.83
July 29, 2026168.79
July 30, 2026168.74
July 31, 2026168.68
August 1, 2026168.63
August 2, 2026168.58
August 3, 2026168.52
August 4, 2026168.47
August 5, 2026168.44
August 6, 2026168.38
August 7, 2026168.32
August 8, 2026168.27
August 9, 2026168.22
August 10, 2026168.16
August 11, 2026168.11
August 12, 2026168.09
August 13, 2026168.07
August 14, 2026168.03
August 15, 2026167.98
August 16, 2026167.92
August 17, 2026167.87
August 18, 2026167.82
August 19, 2026167.76
August 20, 2026167.71
August 21, 2026167.66
August 22, 2026167.60
August 23, 2026167.54

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.

12 years of the 31 with a reading on August 23 were below the most recent level.

From 1992 to 2026.

The dashed line is this reservoir’s most recent level: 167.54 m on August 23, 2026.

The vertical scale runs from 100.00 m to 180.00 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.

12 years of the 31 with a reading on August 23 were below the most recent level.
Every August 23 in the recordm
1992117.07
1993157.69
1995167.85
1996170.04
1997171.97
1998174.59
1999172.79
2000172.88
2001170.62
2002152.48
2003154.47
2004166.93
2005172.63
2006171.88
2008167.64
2009170.91
2010173.30
2011173.13
2012171.28
2013170.63
2014161.46
2015164.32
2017173.94
2018172.66
2019166.02
2020163.23
2021157.14
2022154.80
2024174.26
2025165.91
2026167.54

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

546 days in Safety, since February 16, 2025.

The longest run in Safety on record: 979 days, from December 1, 1993 to September 10, 1996.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020June 29, 2020179
ObservationJuly 7, 2020July 30, 202024
SafetyJuly 31, 2020June 16, 2021308
ObservationJune 17, 2021November 20, 2021151
SafetyNovember 21, 2021May 6, 2022167
ObservationMay 7, 2022September 18, 2022130
SafetySeptember 19, 2022September 27, 20229
OverflowSeptember 28, 2022October 1, 20224
SafetyOctober 2, 2022October 22, 202221
OverflowOctober 23, 2022November 25, 202232
SafetyNovember 26, 2022April 24, 2023150
OverflowApril 25, 2023June 20, 202357
SafetyJune 21, 2023September 17, 202317
OverflowSeptember 18, 2023September 22, 20235
SafetySeptember 23, 2023October 5, 202313
OverflowOctober 6, 2023October 22, 202317
SafetyOctober 23, 2023October 30, 20238
OverflowOctober 31, 2023November 17, 202318
SafetyNovember 18, 2023January 4, 202448
OverflowJanuary 5, 2024April 20, 2024107
SafetyApril 21, 2024August 14, 2024109
OverflowAugust 15, 2024August 19, 20245
SafetyAugust 20, 2024November 15, 202488
OverflowNovember 16, 2024February 15, 202592
SafetyFebruary 16, 2025August 23, 2026546

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.