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Reservoirs

Levels for the 19 reservoirs on AAA's daily bulletin

Patillas

Patillas

Safety

63.46m

208.19 ft

1.28 m above Observation

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

Compared with normal

3.85 m below normal for this date

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

Percentile 3 across 31 years of record.

Rank 16 of 463 readings from these dates. Rank 1 is the lowest.

The rank counts individual readings, not years.

Most recent year lower on this date: 2015.

Median
67.31 m
Minimum
62.05 m2015
Maximum
68.08 m2013
90th percentile
67.62 m

Level over time

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

Patillas: level from July 25, 2026 to August 23, 2026, a net fall of 0.68 m.

August 23, 2026: 63.46 m.

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

From July 25, 2026 to August 23, 2026. Minimum 63.46 m, maximum 64.14 m.

The vertical scale runs from 63.40 m to 64.20 m and does not start at zero: these are metres above sea level.

5 bounds fall outside this chart’s scale.

Patillas: level from July 25, 2026 to August 23, 2026, a net fall of 0.68 m.
Datem
July 25, 202664.14
July 26, 202664.11
July 27, 202664.08
July 28, 202664.05
July 29, 202664.02
July 30, 202663.99
July 31, 202663.96
August 1, 202663.93
August 2, 202663.92
August 3, 202663.92
August 4, 202663.90
August 5, 202663.87
August 6, 202663.85
August 7, 202663.82
August 8, 202663.78
August 9, 202663.76
August 10, 202663.73
August 11, 202663.68
August 12, 202663.73
August 13, 202663.74
August 14, 202663.74
August 15, 202663.69
August 16, 202663.67
August 17, 202663.65
August 18, 202663.60
August 19, 202663.58
August 20, 202663.56
August 21, 202663.53
August 22, 202663.50
August 23, 202663.46

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.

1 year of the 32 with a reading on August 23 was below the most recent level.

From 1995 to 2026.

The dashed line is this reservoir’s most recent level: 63.46 m on August 23, 2026.

The vertical scale runs from 62.00 m to 70.00 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.

1 year of the 32 with a reading on August 23 was below the most recent level.
Every August 23 in the recordm
199567.21
199667.53
199767.16
199867.27
199967.52
200067.37
200166.40
200267.40
200367.39
200467.51
200567.56
200667.45
200767.61
200865.71
200967.39
201067.81
201168.00
201266.18
201367.66
201467.50
201562.14
201663.83
201763.97
201863.91
201964.08
202064.48
202163.90
202264.91
202365.46
202464.87
202565.19
202663.46

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

167 days in Safety, since March 10, 2026.

The longest run in Safety on record: 940 days, from November 18, 2017 to June 16, 2020.

Counts bulletin days, not calendar days.

Each band is one run in one phase, since January 1, 2020.
PhaseFromToBulletin days
SafetyJanuary 1, 2020June 16, 2020168
ObservationJune 17, 2020July 24, 202038
SafetyJuly 25, 2020July 30, 20206
OverflowJuly 31, 2020July 31, 20201
SafetyAugust 1, 2020November 8, 2020100
OverflowNovember 9, 2020November 9, 20201
SafetyNovember 10, 2020November 11, 20202
OverflowNovember 12, 2020November 12, 20201
SafetyNovember 13, 2020May 11, 2021180
ObservationMay 12, 2021June 8, 202128
SafetyJune 9, 2021September 18, 2022466
OverflowSeptember 19, 2022September 21, 20223
SafetySeptember 22, 2022October 26, 202235
OverflowOctober 27, 2022October 27, 20221
SafetyOctober 28, 2022November 5, 20229
OverflowNovember 6, 2022November 6, 20221
SafetyNovember 7, 2022November 7, 20221
OverflowNovember 8, 2022November 9, 20222
SafetyNovember 10, 2022June 29, 2023232
OverflowJune 30, 2023June 30, 20231
SafetyJuly 1, 2023August 20, 202351
OverflowAugust 21, 2023August 21, 20231
SafetyAugust 22, 2023August 25, 20234
OverflowAugust 26, 2023August 27, 20232
SafetyAugust 28, 2023September 14, 202318
OverflowSeptember 15, 2023September 16, 20232
SafetySeptember 17, 2023October 4, 202318
OverflowOctober 5, 2023October 6, 20232
SafetyOctober 7, 2023June 2, 2024240
OverflowJune 3, 2024June 6, 20244
SafetyJune 7, 2024August 14, 202469
OverflowAugust 15, 2024August 15, 20241
SafetyAugust 16, 2024September 9, 202425
OverflowSeptember 10, 2024September 11, 20242
SafetySeptember 12, 2024October 31, 202450
OverflowNovember 1, 2024November 4, 20244
SafetyNovember 5, 2024November 10, 20246
OverflowNovember 11, 2024November 11, 20241
SafetyNovember 12, 2024November 15, 20244
OverflowNovember 16, 2024December 12, 202427
SafetyDecember 13, 2024December 19, 20247
OverflowDecember 20, 2024December 21, 20242
SafetyDecember 22, 2024May 14, 2025144
OverflowMay 15, 2025May 17, 20253
SafetyMay 18, 2025February 26, 2026285
ObservationFebruary 27, 2026March 9, 202611
SafetyMarch 10, 2026August 23, 2026167

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.