Data as of August 31, 2026 · 19 of 19 reservoirs reporting
Showing 19 of 19 reservoirs
Trujillo Alto
Most recent reading
37.15m
121.87 ft
Taken at 5:45 AM
0.15 m above Control
24 hours
+0.07m rose
7 days
-0.20m fell
30 days
-0.80m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Comerío
Most recent reading
44.66m
146.52 ft
Taken at 6:45 AM
4.16 m above Control
24 hours
-0.05m fell
7 days
-0.61m fell
30 days
-2.39m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Cidra
Most recent reading
400.06m
1,312.53 ft
Taken at 5:45 AM; it is also the August 31, 2026 AAA official bulletin figure
1.69 m above Control
24 hours
+0.04m rose
7 days
-0.04m fell
30 days
-0.16m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Villalba
Most recent reading
147.11m
482.66 ft
Taken at 6:15 AM; it is also the August 31, 2026 AAA official bulletin figure
0.11 m above Observation
24 hours
0.00m no change
7 days
-0.12m fell
30 days
-0.62m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Naguabo
Most recent reading
24.50m
80.38 ft
Taken at 6:30 AM
0.25 m above Operational adjustments
24 hours
+0.20m rose
7 days
-0.14m fell
30 days
-1.60m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Fajardo
Most recent reading
46.40m
152.22 ft
Taken at 6:30 AM; it is also the August 31, 2026 AAA official bulletin figure
1.90 m above Operational adjustments
One day with no reading is drawn as a gap, never filled in.
24 hours
+0.16m rose
7 days
-0.27m fell
30 days
-1.61m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Guayama
Most recent reading
541.71m
1,777.25 ft
Taken at 6:15 AM
0.55 m above Observation
24 hours
+0.02m rose
7 days
-0.07m fell
30 days
-0.42m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Patillas
Most recent reading
63.38m
207.93 ft
Taken at 5:45 AM
1.20 m above Observation
24 hours
+0.05m rose
7 days
-0.08m fell
30 days
-0.56m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Orocovis
Most recent reading
901.53m
2,957.77 ft
Taken at 5:45 AM
2.37 m above Observation
24 hours
+0.04m rose
7 days
+0.11m rose
30 days
-0.90m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Orocovis
Most recent reading
733.16m
2,405.38 ft
Taken at 5:45 AM
0.12 m above Observation
24 hours
+0.04m rose
7 days
+0.04m rose
30 days
+0.21m rose
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Juana Díaz
Most recent reading
102.50m
336.30 ft
Taken at 5:50 AM
0.70 m above Operational adjustments
24 hours
+0.11m rose
7 days
-0.01m fell
30 days
-0.02m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Adjuntas
Most recent reading
736.06m
2,414.90 ft
Taken at 5:45 AM
3.02 m above Observation
24 hours
+0.02m rose
7 days
+0.06m rose
30 days
+0.01m rose
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Lares
Most recent reading
442.72m
1,452.50 ft
Taken at 5:45 AM
0.76 m above Observation
24 hours
+0.05m rose
7 days
+0.42m rose
30 days
+0.17m rose
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Yauco
Most recent reading
170.99m
561.00 ft
Taken at 5:45 AM
0.30 m above Observation
24 hours
-0.01m fell
7 days
-0.47m fell
30 days
-0.81m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Yauco
Most recent reading
69.32m
227.42 ft
Taken at 5:45 AM
0.44 m above Operational adjustments
24 hours
-0.05m fell
7 days
-0.55m fell
30 days
-0.58m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Arecibo
Most recent reading
89.68m
294.24 ft
Taken at 5:45 AM
1.59 m above Observation
24 hours
+0.02m rose
7 days
+1.11m rose
30 days
+0.85m rose
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Utuado
Most recent reading
250.53m
821.96 ft
Taken at 5:45 AM; it is also the August 31, 2026 AAA official bulletin figure
2.53 m above Observation
24 hours
+0.05m rose
7 days
-0.62m fell
30 days
-0.83m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Quebradillas
Most recent reading
195.89m
642.68 ft
Taken at 5:45 AM
1.89 m above Observation
24 hours
+0.02m rose
7 days
-0.03m fell
30 days
+0.12m rose
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
Ponce
Most recent reading
167.26m
548.75 ft
Taken at 5:45 AM
6.36 m above Observation
24 hours
0.00m no change
7 days
-0.23m fell
30 days
-1.37m fell
Changes are measured between 5:00 AM bulletins, not against the most recent reading.
The large figure on this portal is the most recent reading we have received from the USGS gauge, with the exact time it was taken. The gauges measure every 15 minutes and transmit in hourly batches, so that figure refreshes through the day and can be several hours old overnight. We keep every one of those measurements.
Beside it we always publish the 5:00 AM AST reading, labelled as such. That is the one we use for everything that compares one day with another — the 24-hour, 7-day and 30-day changes, the history, the phase runs and the comparison against normal — because it is the same cut-off every day, and that is what makes those comparisons valid. Subtracting the 5:00 AM reading from the most recent reading would mix two different cut-off times and cannot be published: a single day's swing alone moves some reservoirs by 26 to 32 cm. Comparing two gauge readings with each other is a different matter — the one at the start of a window against the most recent one: there both ends are the same kind of sample from the same series, and that is the recent change we publish. What we never do is subtract a 5:00 AM figure from a reading taken at any other hour.
AAA's daily bulletin is drawn at 4:55 AM and carries the freshest reading that had arrived by press time; the 5:00 AM reading does not enter the record until 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.
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. AAA publishes those thresholds; which band a reading falls in, and at what time, is our determination from USGS data and not an official AAA notice.
Data: U.S. Geological Survey (USGS)
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.