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Daily Water Watch: La Plata at 42.52 m

Published Oct 26, 2026, 6:06 AM AST787daily · Original analysis

At a glance

  • Carraízo held at 40.75 m, in the Safe band (Seguridad); at this week’s pace, about 58 days until it reaches the Watch line (Observación)
  • La Plata fell 12 cm to 42.52 m, in the Adjustments band (Ajustes); at this week’s pace, about 25 days until it reaches the Control line
  • Carraízo is falling, after a flat week, averaging 1.8 cm a day over the past week; at that pace the Watch line arrives around December 24; 1.52 in of rain over the watershed this week
  • Day 81 of the metro rotation, the San Juan area’s rationing schedule, with interruptions paused since September 2, and the Puerto Rico Aqueduct and Sewer Authority (AAA) has not canceled it; the plan began August 7; levels from the chart AAA publishes at 5:00 AM

Why this matters: The number that matters is the gap to the next band line: 1.05 m for Carraízo, 2.02 m for La Plata. Straight-line dates move every day; the daily check is the point.

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This morning’s 5:00 chart from AAA shows Carraízo flat at 40.75 meters. La Plata is at 42.52 meters, down 12 centimeters from yesterday.

Service today

Day 81 of the metro rotation, the San Juan area’s rationing schedule, with interruptions paused since September 2, and AAA has not canceled it.

AAA’s Cedro Arriba plan in Naranjito is in effect: Zone C and Zone D take turns every 48 hours; Zone D has water until Wednesday at 6:00 AM.

AAA has posted no plan change, open outage or water-quality notice in the last three days.

Every notice AAA posts is on the water page, in its own words.

Reservoirs

Carraízo: holding

Carraízo held its level. This morning’s chart puts it flat at 40.75 meters, in the Safe band (Seguridad). The next line on the chart, into the Watch band (Observación), sits at 39.70 meters, 1.05 meters below this morning’s reading. At this week’s pace that is about 58 days away (at this pace, December 24: a projection, not a forecast; one wet afternoon moves it).

Adjustments Watch Safe 37.0 37.5 38.0 38.5 39.0 39.5 40.0 40.5 41.0 Aug 28 Sep 26 Oct 26 Oct 3, 40.70 m, USGS gauge at 5 AM, Safe Aug 28, 37.20 m, AdjustmentsAug 29, 37.14 m, −6 cm, AdjustmentsAug 30, 37.07 m, −7 cm, AdjustmentsAug 31, 37.14 m, +7 cm, AdjustmentsSep 1, 37.20 m, +6 cm, AdjustmentsSep 2, 38.92 m, +172 cm, WatchSep 3, 39.11 m, +19 cm, WatchSep 4, 39.09 m, −2 cm, WatchSep 5, 39.01 m, −8 cm, WatchSep 6, 38.94 m, −7 cm, WatchSep 7, 38.87 m, −7 cm, WatchSep 8, 38.83 m, −4 cm, WatchSep 9, 39.02 m, +19 cm, WatchSep 10, 39.07 m, +5 cm, WatchSep 11, 39.20 m, +13 cm, WatchSep 12, 39.19 m, −1 cm, WatchSep 13, 39.14 m, −5 cm, WatchSep 14, 39.16 m, +2 cm, WatchSep 15, 39.25 m, +9 cm, WatchSep 16, 39.23 m, −2 cm, WatchSep 17, 40.06 m, +83 cm, SafeSep 18, 40.64 m, +58 cm, SafeSep 19, 40.80 m, +16 cm, SafeSep 20, 40.81 m, +1 cm, SafeSep 21, 40.79 m, −2 cm, SafeSep 22, 40.75 m, −4 cm, SafeSep 23, 40.70 m, −5 cm, SafeSep 24, 40.68 m, −2 cm, SafeSep 25, 40.68 m, +0 cm, SafeSep 26, 40.67 m, −1 cm, SafeSep 27, 40.63 m, −4 cm, SafeSep 28, 40.58 m, −5 cm, SafeSep 29, 40.53 m, −5 cm, SafeSep 30, 40.51 m, −2 cm, SafeOct 1, 40.47 m, −4 cm, SafeOct 2, 40.60 m, +13 cm, SafeOct 4, 40.74 m, +4 cm, SafeOct 5, 40.72 m, −2 cm, SafeOct 6, 40.69 m, −3 cm, SafeOct 7, 40.65 m, −4 cm, SafeOct 8, 40.88 m, +23 cm, SafeOct 9, 40.94 m, +6 cm, SafeOct 10, 40.91 m, −3 cm, SafeOct 11, 40.96 m, +5 cm, SpillingOct 12, 40.86 m, −10 cm, SafeOct 13, 40.90 m, +4 cm, SafeOct 14, 40.94 m, +4 cm, SafeOct 15, 40.85 m, −9 cm, SafeOct 16, 40.87 m, +2 cm, SafeOct 17, 40.85 m, −2 cm, SafeOct 18, 40.85 m, +0 cm, SafeOct 19, 40.87 m, +2 cm, SafeOct 20, 40.86 m, −1 cm, SafeOct 21, 40.88 m, +2 cm, SafeOct 22, 40.85 m, −3 cm, SafeOct 23, 40.81 m, −4 cm, SafeOct 24, 40.77 m, −4 cm, SafeOct 25, 40.75 m, −2 cm, SafeOct 26, 40.75 m, +0 cm, Safe 40.75 m at ~2 cm/day Oct 20, 0.77 in of rainOct 22, 0.42 in of rainOct 23, 0.02 in of rainOct 24, 0.26 in of rainOct 25, 0.01 in of rainOct 26, 0.04 in of rain rain to 0.77 in
Carraízo since Aug 28, meters above sea level, shaded by AAA alert band, with daily rain from gauges the U.S. Geological Survey (USGS) runs within 12 km. Data: AAA Monitoreo Diario; hollow points are the USGS gauge's 5 AM reading on mornings AAA's chart has none (AAA's own record here starts Aug 28).
Show the numbers
  • Aug 28, 37.20 m, Adjustments
  • Aug 29, 37.14 m, −6 cm, Adjustments
  • Aug 30, 37.07 m, −7 cm, Adjustments
  • Aug 31, 37.14 m, +7 cm, Adjustments
  • Sep 1, 37.20 m, +6 cm, Adjustments
  • Sep 2, 38.92 m, +172 cm, Watch
  • Sep 3, 39.11 m, +19 cm, Watch
  • Sep 4, 39.09 m, −2 cm, Watch
  • Sep 5, 39.01 m, −8 cm, Watch
  • Sep 6, 38.94 m, −7 cm, Watch
  • Sep 7, 38.87 m, −7 cm, Watch
  • Sep 8, 38.83 m, −4 cm, Watch
  • Sep 9, 39.02 m, +19 cm, Watch
  • Sep 10, 39.07 m, +5 cm, Watch
  • Sep 11, 39.20 m, +13 cm, Watch
  • Sep 12, 39.19 m, −1 cm, Watch
  • Sep 13, 39.14 m, −5 cm, Watch
  • Sep 14, 39.16 m, +2 cm, Watch
  • Sep 15, 39.25 m, +9 cm, Watch
  • Sep 16, 39.23 m, −2 cm, Watch
  • Sep 17, 40.06 m, +83 cm, Safe
  • Sep 18, 40.64 m, +58 cm, Safe
  • Sep 19, 40.80 m, +16 cm, Safe
  • Sep 20, 40.81 m, +1 cm, Safe
  • Sep 21, 40.79 m, −2 cm, Safe
  • Sep 22, 40.75 m, −4 cm, Safe
  • Sep 23, 40.70 m, −5 cm, Safe
  • Sep 24, 40.68 m, −2 cm, Safe
  • Sep 25, 40.68 m, +0 cm, Safe
  • Sep 26, 40.67 m, −1 cm, Safe
  • Sep 27, 40.63 m, −4 cm, Safe
  • Sep 28, 40.58 m, −5 cm, Safe
  • Sep 29, 40.53 m, −5 cm, Safe
  • Sep 30, 40.51 m, −2 cm, Safe
  • Oct 1, 40.47 m, −4 cm, Safe
  • Oct 2, 40.60 m, +13 cm, Safe
  • Oct 3, 40.70 m, USGS gauge at 5 AM, Safe
  • Oct 4, 40.74 m, +4 cm, Safe
  • Oct 5, 40.72 m, −2 cm, Safe
  • Oct 6, 40.69 m, −3 cm, Safe
  • Oct 7, 40.65 m, −4 cm, Safe
  • Oct 8, 40.88 m, +23 cm, Safe
  • Oct 9, 40.94 m, +6 cm, Safe
  • Oct 10, 40.91 m, −3 cm, Safe
  • Oct 11, 40.96 m, +5 cm, Spilling
  • Oct 12, 40.86 m, −10 cm, Safe
  • Oct 13, 40.90 m, +4 cm, Safe
  • Oct 14, 40.94 m, +4 cm, Safe
  • Oct 15, 40.85 m, −9 cm, Safe
  • Oct 16, 40.87 m, +2 cm, Safe
  • Oct 17, 40.85 m, −2 cm, Safe
  • Oct 18, 40.85 m, +0 cm, Safe
  • Oct 19, 40.87 m, +2 cm, Safe
  • Oct 20, 40.86 m, −1 cm, Safe
  • Oct 21, 40.88 m, +2 cm, Safe
  • Oct 22, 40.85 m, −3 cm, Safe
  • Oct 23, 40.81 m, −4 cm, Safe
  • Oct 24, 40.77 m, −4 cm, Safe
  • Oct 25, 40.75 m, −2 cm, Safe
  • Oct 26, 40.75 m, +0 cm, Safe
  • Oct 20, 0.77 in of rain
  • Oct 22, 0.42 in of rain
  • Oct 23, 0.02 in of rain
  • Oct 24, 0.26 in of rain
  • Oct 25, 0.01 in of rain
  • Oct 26, 0.04 in of rain

Carraízo, October 26

Level today
40.75 mSafe band
Change since yesterday
0 cm
To the Watch line
1.05 mline at 39.70 m
At this week's pace
about 58 daysat this pace: December 24

La Plata: down 12 cm

La Plata kept sliding. This morning’s chart puts it at 42.52 meters, down 12 centimeters from yesterday, in the Adjustments band (Ajustes). The next line on the chart, into the Control band, sits at 40.50 meters, 2.02 meters below this morning’s reading. At this week’s pace that is about 25 days away (at this pace, November 21: a projection, not a forecast; one wet afternoon moves it).

If your water comes from La Plata (Dorado, Guaynabo, Naranjito, Toa Alta, Toa Baja, Vega Alta, Bayamón, Cataño, Corozal), this is the reservoir to watch; AAA lists 130,828 client accounts on it.

Adjustments Watch Safe 40 42 44 46 48 50 52 Aug 28 Sep 26 Oct 26 Oct 3, 43.87 m, USGS gauge at 5 AM, Adjustments Aug 28, 44.93 m, WatchAug 29, 44.83 m, −10 cm, AdjustmentsAug 30, 44.72 m, −11 cm, AdjustmentsAug 31, 44.67 m, −5 cm, AdjustmentsSep 1, 44.59 m, −8 cm, AdjustmentsSep 2, 44.59 m, +0 cm, AdjustmentsSep 3, 44.59 m, +0 cm, AdjustmentsSep 4, 44.57 m, −2 cm, AdjustmentsSep 5, 44.54 m, −3 cm, AdjustmentsSep 6, 44.52 m, −2 cm, AdjustmentsSep 7, 44.46 m, −6 cm, AdjustmentsSep 8, 44.40 m, −6 cm, AdjustmentsSep 9, 44.32 m, −8 cm, AdjustmentsSep 10, 44.24 m, −8 cm, AdjustmentsSep 11, 44.14 m, −10 cm, AdjustmentsSep 12, 44.25 m, +11 cm, AdjustmentsSep 13, 44.26 m, +1 cm, AdjustmentsSep 14, 44.40 m, +14 cm, AdjustmentsSep 15, 44.46 m, +6 cm, AdjustmentsSep 16, 44.40 m, −6 cm, AdjustmentsSep 17, 44.36 m, −4 cm, AdjustmentsSep 18, 44.40 m, +4 cm, AdjustmentsSep 19, 44.61 m, +21 cm, AdjustmentsSep 20, 44.66 m, +5 cm, AdjustmentsSep 21, 44.70 m, +4 cm, AdjustmentsSep 22, 44.72 m, +2 cm, AdjustmentsSep 23, 44.68 m, −4 cm, AdjustmentsSep 24, 44.63 m, −5 cm, AdjustmentsSep 25, 44.56 m, −7 cm, AdjustmentsSep 26, 44.47 m, −9 cm, AdjustmentsSep 27, 44.39 m, −8 cm, AdjustmentsSep 28, 44.31 m, −8 cm, AdjustmentsSep 29, 44.22 m, −9 cm, AdjustmentsSep 30, 44.13 m, −9 cm, AdjustmentsOct 1, 44.04 m, −9 cm, AdjustmentsOct 2, 43.96 m, −8 cm, AdjustmentsOct 4, 43.79 m, −8 cm, AdjustmentsOct 5, 43.71 m, −8 cm, AdjustmentsOct 6, 43.70 m, −1 cm, AdjustmentsOct 7, 43.68 m, −2 cm, AdjustmentsOct 8, 43.62 m, −6 cm, AdjustmentsOct 9, 43.54 m, −8 cm, AdjustmentsOct 10, 43.52 m, −2 cm, AdjustmentsOct 11, 43.50 m, −2 cm, AdjustmentsOct 12, 43.45 m, −5 cm, AdjustmentsOct 13, 43.45 m, +0 cm, AdjustmentsOct 14, 43.50 m, +5 cm, AdjustmentsOct 15, 43.47 m, −3 cm, AdjustmentsOct 16, 43.39 m, −8 cm, AdjustmentsOct 17, 43.29 m, −10 cm, AdjustmentsOct 18, 43.18 m, −11 cm, AdjustmentsOct 19, 43.07 m, −11 cm, AdjustmentsOct 20, 43.00 m, −7 cm, AdjustmentsOct 21, 43.06 m, +6 cm, AdjustmentsOct 22, 42.97 m, −9 cm, AdjustmentsOct 23, 42.87 m, −10 cm, AdjustmentsOct 24, 42.76 m, −11 cm, AdjustmentsOct 25, 42.64 m, −12 cm, AdjustmentsOct 26, 42.52 m, −12 cm, Adjustments 42.52 m at ~8 cm/day
La Plata since Aug 28, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario; hollow points are the USGS gauge's 5 AM reading on mornings AAA's chart has none (AAA's own record here starts Aug 28).
Show the numbers
  • Aug 28, 44.93 m, Watch
  • Aug 29, 44.83 m, −10 cm, Adjustments
  • Aug 30, 44.72 m, −11 cm, Adjustments
  • Aug 31, 44.67 m, −5 cm, Adjustments
  • Sep 1, 44.59 m, −8 cm, Adjustments
  • Sep 2, 44.59 m, +0 cm, Adjustments
  • Sep 3, 44.59 m, +0 cm, Adjustments
  • Sep 4, 44.57 m, −2 cm, Adjustments
  • Sep 5, 44.54 m, −3 cm, Adjustments
  • Sep 6, 44.52 m, −2 cm, Adjustments
  • Sep 7, 44.46 m, −6 cm, Adjustments
  • Sep 8, 44.40 m, −6 cm, Adjustments
  • Sep 9, 44.32 m, −8 cm, Adjustments
  • Sep 10, 44.24 m, −8 cm, Adjustments
  • Sep 11, 44.14 m, −10 cm, Adjustments
  • Sep 12, 44.25 m, +11 cm, Adjustments
  • Sep 13, 44.26 m, +1 cm, Adjustments
  • Sep 14, 44.40 m, +14 cm, Adjustments
  • Sep 15, 44.46 m, +6 cm, Adjustments
  • Sep 16, 44.40 m, −6 cm, Adjustments
  • Sep 17, 44.36 m, −4 cm, Adjustments
  • Sep 18, 44.40 m, +4 cm, Adjustments
  • Sep 19, 44.61 m, +21 cm, Adjustments
  • Sep 20, 44.66 m, +5 cm, Adjustments
  • Sep 21, 44.70 m, +4 cm, Adjustments
  • Sep 22, 44.72 m, +2 cm, Adjustments
  • Sep 23, 44.68 m, −4 cm, Adjustments
  • Sep 24, 44.63 m, −5 cm, Adjustments
  • Sep 25, 44.56 m, −7 cm, Adjustments
  • Sep 26, 44.47 m, −9 cm, Adjustments
  • Sep 27, 44.39 m, −8 cm, Adjustments
  • Sep 28, 44.31 m, −8 cm, Adjustments
  • Sep 29, 44.22 m, −9 cm, Adjustments
  • Sep 30, 44.13 m, −9 cm, Adjustments
  • Oct 1, 44.04 m, −9 cm, Adjustments
  • Oct 2, 43.96 m, −8 cm, Adjustments
  • Oct 3, 43.87 m, USGS gauge at 5 AM, Adjustments
  • Oct 4, 43.79 m, −8 cm, Adjustments
  • Oct 5, 43.71 m, −8 cm, Adjustments
  • Oct 6, 43.70 m, −1 cm, Adjustments
  • Oct 7, 43.68 m, −2 cm, Adjustments
  • Oct 8, 43.62 m, −6 cm, Adjustments
  • Oct 9, 43.54 m, −8 cm, Adjustments
  • Oct 10, 43.52 m, −2 cm, Adjustments
  • Oct 11, 43.50 m, −2 cm, Adjustments
  • Oct 12, 43.45 m, −5 cm, Adjustments
  • Oct 13, 43.45 m, +0 cm, Adjustments
  • Oct 14, 43.50 m, +5 cm, Adjustments
  • Oct 15, 43.47 m, −3 cm, Adjustments
  • Oct 16, 43.39 m, −8 cm, Adjustments
  • Oct 17, 43.29 m, −10 cm, Adjustments
  • Oct 18, 43.18 m, −11 cm, Adjustments
  • Oct 19, 43.07 m, −11 cm, Adjustments
  • Oct 20, 43.00 m, −7 cm, Adjustments
  • Oct 21, 43.06 m, +6 cm, Adjustments
  • Oct 22, 42.97 m, −9 cm, Adjustments
  • Oct 23, 42.87 m, −10 cm, Adjustments
  • Oct 24, 42.76 m, −11 cm, Adjustments
  • Oct 25, 42.64 m, −12 cm, Adjustments
  • Oct 26, 42.52 m, −12 cm, Adjustments

La Plata, October 26

Level today
42.52 mAdjustments band
Change since yesterday
−12 cm
To the Control line
2.02 mline at 40.50 m
At this week's pace
about 25 daysat this pace: November 21

Cidra: the other rationing reservoir

Level today
400.60 mWatch band
Change since yesterday
0 cm
To the Adjustments line
0.37 mline at 400.23 m
At this week's pace
holding

Outlook

What the numbers say

La Plata is the reservoir to watch this week. It has dropped for five straight mornings and the daily loss is growing, with no rain at its gauges to slow it. Its pace to the Control line is arithmetic at the current rate, not a forecast, and it can shift quickly if the decline eases or rain arrives. Carraízo, by contrast, has moved from a nearly flat week to a slow slide, and its band line is much farther off.

The rain did little for the reservoirs this week. Carraízo got 1.52 in of rain, and the morning after its wettest day the reading rose only 2 cm. Cidra received 2.53 in across its gauges, yet its level barely moved and is effectively flat for the week. Rain that lands around a reservoir is not the same as water reaching it, and soils that have been dry can absorb a lot before runoff arrives. Rationing began 80 days ago and Carraízo remains well above where it started, while La Plata has lost ground since then.

What to watch

  • La Plata: rain. With none this week, the decline is pure demand, and the first wet afternoon over the watershed shows up in the next morning’s number.
  • Naranjito: whether AAA extends its Cedro Arriba plan (the calendar runs through October 31), changes the phase or ends it.

Lake levels

The gauge USGS runs at Carraízo read 40.75 meters at 5:45 AM. The gauge USGS runs at La Plata read 42.50 meters at 5:45 AM. The gauge USGS runs at Cidra read 400.60 meters at 5:45 AM.

The gauges report every quarter hour and their readings are provisional; the bands are measured on AAA’s 5:00 chart.

How we read the data

This is the 69th Daily Water Watch (yesterday’s is here). The levels update every morning on the water page.

Levels: AAA’s daily reservoir chart, October 26. Rain: gauges USGS runs within 12 km of each reservoir. Day counts start August 7, when the metro rotation took effect. Straight-line dates are arithmetic, not forecasts. How we report.

In context

About this analysisOriginal 787daily analysis of AAA's 5 AM reservoir chart, validated daily · Report an error
Cite this

Source: 787daily, “Daily Water Watch: La Plata at 42.52 m”, Oct 26, 2026, https://787daily.com/news/2026-10-26-daily-water-watch-la-plata-at-42-52-m/

Numbers from
AAA's 5 AM reservoir chart, validated daily
Use our data
Today (JSON) · Reservoir history (CSV).Free to reuse under CC BY 4.0: credit 787daily.com with a link.

Every Daily Water Watch

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Background

About Daily Water Watch

Each morning's reading of the 19 AAA reservoirs: today's level, the day-over-day change, the alert band and the pace to the next line, with metro rationing status.

Published
Daily
Source
AAA's 5 AM reservoir chart, validated daily
Water

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