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Daily Water Watch: La Plata at 41.83 m

Published Nov 4, 2026, 6:07 AM AST787daily · Original analysis

At a glance

  • Carraízo fell 2 cm to 40.70 m, in the Safe band (Seguridad), 1.00 m above the Watch line (Observación)
  • La Plata fell 11 cm to 41.83 m, in the Adjustments band (Ajustes); at this week’s pace, about 18 days until it reaches the Control line
  • Carraízo is falling, but slowing, averaging 1 cm a day over the past week; 1 in of rain over the watershed this week
  • Day 90 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: 1.00 m for Carraízo, 1.33 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 at 40.70 meters, down 2 centimeters from yesterday. La Plata is at 41.83 meters, down 11 centimeters from yesterday.

Service today

Day 90 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: AAA’s published calendar has run out; AAA has not said what follows.

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: down 2 cm

Carraízo slipped overnight. This morning’s chart puts it at 40.70 meters, down 2 centimeters from yesterday, in the Safe band (Seguridad). The next line on the chart, into the Watch band (Observación), sits at 39.70 meters, 1.00 meters below this morning’s reading.

Adjustments Watch Safe 37.0 37.5 38.0 38.5 39.0 39.5 40.0 40.5 41.0 Sep 6 Oct 5 Nov 4 Oct 3, 40.70 m, USGS gauge at 5 AM, Safe Sep 6, 38.94 m, 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, SafeOct 27, 40.73 m, −2 cm, SafeOct 28, 40.77 m, +4 cm, SafeOct 29, 40.76 m, −1 cm, SafeOct 30, 40.75 m, −1 cm, SafeOct 31, 40.72 m, −3 cm, SafeNov 1, 40.74 m, +2 cm, SafeNov 2, 40.72 m, −2 cm, SafeNov 3, 40.72 m, +0 cm, SafeNov 4, 40.70 m, −2 cm, Safe 40.70 m at ~1 cm/day Oct 29, 0.01 in of rainOct 30, 0.16 in of rainOct 31, 0.45 in of rainNov 1, 0.16 in of rainNov 2, 0.21 in of rainNov 3, 0.01 in of rain rain to 0.45 in
Carraízo since Sep 6, 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 Sep 6).
Show the numbers
  • Sep 6, 38.94 m, 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 27, 40.73 m, −2 cm, Safe
  • Oct 28, 40.77 m, +4 cm, Safe
  • Oct 29, 40.76 m, −1 cm, Safe
  • Oct 30, 40.75 m, −1 cm, Safe
  • Oct 31, 40.72 m, −3 cm, Safe
  • Nov 1, 40.74 m, +2 cm, Safe
  • Nov 2, 40.72 m, −2 cm, Safe
  • Nov 3, 40.72 m, +0 cm, Safe
  • Nov 4, 40.70 m, −2 cm, Safe
  • Oct 29, 0.01 in of rain
  • Oct 30, 0.16 in of rain
  • Oct 31, 0.45 in of rain
  • Nov 1, 0.16 in of rain
  • Nov 2, 0.21 in of rain
  • Nov 3, 0.01 in of rain

Carraízo, November 4

Level today
40.70 mSafe band
Change since yesterday
−2 cm
To the Watch line
1.00 mline at 39.70 m
At this week's pace
months awaythe decline is very shallow

La Plata: down 11 cm

La Plata kept sliding. This morning’s chart puts it at 41.83 meters, down 11 centimeters from yesterday, in the Adjustments band (Ajustes). The next line on the chart, into the Control band, sits at 40.50 meters, 1.33 meters below this morning’s reading. At this week’s pace that is about 18 days away (at this pace, November 23: 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 Sep 6 Oct 5 Nov 4 Oct 3, 43.87 m, USGS gauge at 5 AM, Adjustments Sep 6, 44.52 m, 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, AdjustmentsOct 27, 42.40 m, −12 cm, AdjustmentsOct 28, 42.28 m, −12 cm, AdjustmentsOct 29, 42.27 m, −1 cm, AdjustmentsOct 30, 42.27 m, +0 cm, AdjustmentsOct 31, 42.20 m, −7 cm, AdjustmentsNov 1, 42.12 m, −8 cm, AdjustmentsNov 2, 42.04 m, −8 cm, AdjustmentsNov 3, 41.94 m, −10 cm, AdjustmentsNov 4, 41.83 m, −11 cm, Adjustments 41.83 m at ~7 cm/day Oct 30, 0.16 in of rainOct 31, 0.38 in of rainNov 1, 0.02 in of rainNov 2, 0.05 in of rainNov 3, 0.01 in of rain rain to 0.38 in
La Plata since Sep 6, meters above sea level, shaded by AAA alert band, with daily rain from gauges 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 Sep 6).
Show the numbers
  • Sep 6, 44.52 m, 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
  • Oct 27, 42.40 m, −12 cm, Adjustments
  • Oct 28, 42.28 m, −12 cm, Adjustments
  • Oct 29, 42.27 m, −1 cm, Adjustments
  • Oct 30, 42.27 m, +0 cm, Adjustments
  • Oct 31, 42.20 m, −7 cm, Adjustments
  • Nov 1, 42.12 m, −8 cm, Adjustments
  • Nov 2, 42.04 m, −8 cm, Adjustments
  • Nov 3, 41.94 m, −10 cm, Adjustments
  • Nov 4, 41.83 m, −11 cm, Adjustments
  • Oct 30, 0.16 in of rain
  • Oct 31, 0.38 in of rain
  • Nov 1, 0.02 in of rain
  • Nov 2, 0.05 in of rain
  • Nov 3, 0.01 in of rain

La Plata, November 4

Level today
41.83 mAdjustments band
Change since yesterday
−11 cm
To the Control line
1.33 mline at 40.50 m
At this week's pace
about 18 daysat this pace: November 23

Cidra: the other rationing reservoir

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

Outlook

What the numbers say

The week’s pattern across the main reservoirs is a slowdown, not a recovery. Carraízo and La Plata are both still falling, but each is losing ground more slowly than the week before, and Cidra is effectively flat. Carraízo, the largest of the three, is dropping about 1 cm a day, and at that pace its next band line is more than two months away. That is arithmetic, not a forecast, and it says nothing about what the weather will do.

La Plata is the one to watch. It has dropped five mornings in a row and sits in the Adjustments band, with the Control line 1.33 m below. At this week’s rate, which is arithmetic and not a forecast, it would reach that line around November 23. The rain did little to change this: Cidra received 1.56 in this week, yet the morning after its wettest day its level did not move. The scheduled interruptions are paused, so none of these changes can be credited to the rotation.

What to watch

  • Carraízo: whether the slowdown holds. A second week under 1.3 cm a day would show the decline easing.
  • La Plata: the Control line is inside three weeks at this pace; a band change there would be the next real news.
  • La Plata: whether the slowdown holds. A second week under 11.5 cm a day would show the decline easing.
  • 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 40.70 meters at 5:45 AM. The gauge USGS runs at La Plata read 41.82 meters at 5:45 AM. The gauge USGS runs at Cidra read 400.58 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 77th Daily Water Watch (yesterday’s is here). The levels update every morning on the water page.

Levels: AAA’s daily reservoir chart, November 4. 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 41.83 m”, Nov 4, 2026, https://787daily.com/news/2026-11-04-daily-water-watch-la-plata-at-41-83-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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