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Water Week in Review: Carraízo Down 3 cm, Oct 25–31

Published Nov 1, 2026, 6:04 AM AST787daily · Original analysis

At a glance

  • Carraízo: 40.75 → 40.72 m (−3 cm) over 6 days, Safe band, 1.32 in of rain nearby in the final week
  • La Plata: 42.64 → 42.20 m (−44 cm) over 6 days, Adjustments band, 0.6 in of rain nearby in the final week
  • Cidra: 400.60 → 400.59 m (−1 cm) over 6 days, Watch band, 2.3 in of rain nearby in the final week
  • Readings of October 25–31: the Puerto Rico Aqueduct and Sewer Authority (AAA) posted a chart on 7 of 7 days

Why this matters: What the week changed is the distance to the next band line (1.02 m for Carraízo, 1.70 m for La Plata) and the pace at which it is closing or opening.

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The week of October 25–31 on AAA’s reservoir charts: Carraízo down 3 cm, La Plata down 44 cm. The numbers first, then what they add up to.

Where the reservoirs stand

Control Adjustments Ajustes Watch Observación Safe Seguridad Spilling Carraízo, 40.72 m, Safe (Seguridad), +308 cm since Aug 7, −5 cm vs Oct 24 40.72 Carraízo La Plata, 42.20 m, Adjustments (Ajustes), −435 cm since Aug 7, −56 cm vs Oct 24 42.20 La Plata Cidra, 400.59 m, Watch (Observación), +42 cm since Aug 7, −2 cm vs Oct 24 400.59 Cidra Toa Vaca, 147.91 m, Safe (Seguridad), +27 cm since Aug 7, +4 cm vs Oct 24 147.91 Toa Vaca Río Blanco, 28.25 m, Safe (Seguridad), +259 cm since Aug 7, +22 cm vs Oct 24 28.25 Río Blanco Fajardo, 50.99 m, Safe (Seguridad), +340 cm since Aug 7, +78 cm vs Oct 24 50.99 Fajardo AAA: DRINKING WATER Carite, 542.73 m, Safe (Seguridad), +72 cm since Aug 7, +21 cm vs Oct 24 542.73 Carite Patillas, 65.70 m, Safe (Seguridad), +188 cm since Aug 7, +20 cm vs Oct 24 65.70 Patillas Guineo, 901.74 m, Safe (Seguridad), −68 cm since Aug 7, +44 cm vs Oct 24 901.74 Guineo Matrullas, 733.61 m, Safe (Seguridad), +62 cm since Aug 7, +51 cm vs Oct 24 733.61 Matrullas Guayabal, 103.90 m, Safe (Seguridad), +155 cm since Aug 7, +5 cm vs Oct 24 103.90 Guayabal Garzas, 736.05 m, Safe (Seguridad), +6 cm since Aug 7, −1 cm vs Oct 24 736.05 Garzas Guayo, 444.42 m, Safe (Seguridad), +163 cm since Aug 7, −63 cm vs Oct 24 444.42 Guayo Lucchetti, 172.18 m, Safe (Seguridad), +85 cm since Aug 7, +32 cm vs Oct 24 172.18 Lucchetti Loco, 70.18 m, Spilling (Desborde), +40 cm since Aug 7, +3 cm vs Oct 24 70.18 Loco Dos Bocas, 89.41 m, Safe (Seguridad), −15 cm since Aug 7, +36 cm vs Oct 24 89.41 Dos Bocas Caonillas, 251.19 m, Safe (Seguridad), +48 cm since Aug 7, −60 cm vs Oct 24 251.19 Caonillas Guajataca, 196.55 m, Spilling (Desborde), +61 cm since Aug 7, +23 cm vs Oct 24 196.55 Guajataca PREPA: HYDROELECTRIC Cerrillos, 166.26 m, Safe (Seguridad), −207 cm since Aug 7, −9 cm vs Oct 24 166.26 Cerrillos DRNA
Week 13 of the metro rotation (the San Juan area's rationing schedule). Where the 19 reservoirs stand as of Oct 31: each column is that reservoir's own ladder of AAA bands, the bar its level in meters, the dashed tick where it stood on August 7, day one of the rotation, the triangle its change from seven days earlier. Source: AAA's 5 AM readings; bands as AAA's monitoring chart defines them.

17 of 19 reservoirs sit in the Safe band (Seguridad) or above, 1 in the Watch band (Observación); La Plata is in the Adjustments band (Ajustes). Since August 7, Carraízo (Adjustments → Safe), Cidra (Adjustments → Watch), Río Blanco (Watch → Safe), Fajardo (Watch → Safe), Matrullas (Watch → Safe), Guayabal (Watch → Safe), Loco (Safe → Spilling), Guajataca (Safe → Spilling) have moved up a band; La Plata (Watch → Adjustments), Guineo (Spilling → Safe) have slipped down. The biggest move since Oct 24 is Fajardo, up 78 cm to 50.99 m.

Reservoir by reservoir

Carraízo

Oct 25 → Oct 31
40.75 → 40.72 mSafe band today
Net change
−3 cm0.5 cm a day on average
Best morning
+4 cmOct 28
Worst morning
−3 cmOct 31
Rain nearby, last 7 days
1.32 inmost on Oct 26 (0.49 in)
Above the Watch line
1.02 mholding

La Plata

Oct 25 → Oct 31
42.64 → 42.20 mAdjustments band today
Net change
−44 cm7.3 cm a day on average
Worst morning
−12 cmOct 26
Rain nearby, last 7 days
0.6 inmost on Oct 31 (0.38 in)
Above the Control line
1.70 m≈ 23 days at this week's pace

Cidra

Oct 25 → Oct 31
400.60 → 400.59 mWatch band today
Net change
−1 cm0.2 cm a day on average
Worst morning
−1 cmOct 29
Rain nearby, last 7 days
2.3 inmost on Oct 26 (0.8 in)
Above the Adjustments line
0.36 mholding

Carraízo, this week

Carraízo, morning by morning. Tap a day for that day's Daily Water Watch

Teal = up from the previous reading, coral = down; a bold border marks a move of 20 cm or more. A day with no chart is grey, and the next day's move covers both.

Three reservoirs, one scale

0 +10 cm −44 cm Oct 25 Oct 31 Carraízo, Oct 25, 40.75 m, ±0 cm since Oct 25Carraízo, Oct 25, 40.75 m, ±0 cm since Oct 25Carraízo, Oct 26, 40.75 m, ±0 cm since Oct 25Carraízo, Oct 26, 40.75 m, ±0 cm since Oct 25Carraízo, Oct 27, 40.73 m, −2 cm since Oct 25Carraízo, Oct 27, 40.73 m, −2 cm since Oct 25Carraízo, Oct 28, 40.77 m, +2 cm since Oct 25Carraízo, Oct 28, 40.77 m, +2 cm since Oct 25Carraízo, Oct 29, 40.76 m, +1 cm since Oct 25Carraízo, Oct 29, 40.76 m, +1 cm since Oct 25Carraízo, Oct 30, 40.75 m, ±0 cm since Oct 25Carraízo, Oct 30, 40.75 m, ±0 cm since Oct 25Carraízo, Oct 31, 40.72 m, −3 cm since Oct 25Carraízo, Oct 31, 40.72 m, −3 cm since Oct 25Carraízo −3 cm La Plata, Oct 25, 42.64 m, ±0 cm since Oct 25La Plata, Oct 25, 42.64 m, ±0 cm since Oct 25La Plata, Oct 26, 42.52 m, −12 cm since Oct 25La Plata, Oct 26, 42.52 m, −12 cm since Oct 25La Plata, Oct 27, 42.40 m, −24 cm since Oct 25La Plata, Oct 27, 42.40 m, −24 cm since Oct 25La Plata, Oct 28, 42.28 m, −36 cm since Oct 25La Plata, Oct 28, 42.28 m, −36 cm since Oct 25La Plata, Oct 29, 42.27 m, −37 cm since Oct 25La Plata, Oct 29, 42.27 m, −37 cm since Oct 25La Plata, Oct 30, 42.27 m, −37 cm since Oct 25La Plata, Oct 30, 42.27 m, −37 cm since Oct 25La Plata, Oct 31, 42.20 m, −44 cm since Oct 25La Plata, Oct 31, 42.20 m, −44 cm since Oct 25La Plata −44 cm Cidra, Oct 25, 400.60 m, ±0 cm since Oct 25Cidra, Oct 25, 400.60 m, ±0 cm since Oct 25Cidra, Oct 26, 400.60 m, ±0 cm since Oct 25Cidra, Oct 26, 400.60 m, ±0 cm since Oct 25Cidra, Oct 27, 400.60 m, ±0 cm since Oct 25Cidra, Oct 27, 400.60 m, ±0 cm since Oct 25Cidra, Oct 28, 400.60 m, ±0 cm since Oct 25Cidra, Oct 28, 400.60 m, ±0 cm since Oct 25Cidra, Oct 29, 400.59 m, −1 cm since Oct 25Cidra, Oct 29, 400.59 m, −1 cm since Oct 25Cidra, Oct 30, 400.59 m, −1 cm since Oct 25Cidra, Oct 30, 400.59 m, −1 cm since Oct 25Cidra, Oct 31, 400.59 m, −1 cm since Oct 25Cidra, Oct 31, 400.59 m, −1 cm since Oct 25Cidra −1 cm
Change since Oct 25, in centimeters: three reservoirs on one scale. Hover or tap a point for the day's reading. Data: AAA Monitoreo Diario.

What it adds up to

What changed the picture this week is La Plata. It lost 44 cm in six days, fell nearly every morning, and now sits in the Adjustments band (Ajustes), well below Carraízo and Cidra in standing. Last week’s pace was almost the same (-7 cm a day), so this is a steady slide, not a one-off. At this week’s rate the Control line at 40.50 m is about 23 days away, around November 24. That is arithmetic, not a forecast.

The rain did not change that. Cidra took 2.3 in across 11 gauges, yet its next-morning change after both wet days was zero, and it sits 0.36 m above the Adjustments line, barely moving. Carraízo got 1.32 in and is still in the Safe band (Seguridad), 1.02 m above observación, essentially flat apart from a 4 cm gain on October 28. La Plata’s 0.6 in of rain left it falling.

Each reservoir against its own next band line
Adjustments Watch Safe 37.0 37.5 38.0 38.5 39.0 39.5 40.0 40.5 41.0 Oct 25 Oct 28 Oct 31 Oct 25, 40.75 m, 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, Safe 40.72 m
Carraízo since Oct 25, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 25, 40.75 m, 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
Adjustments Watch Safe 40 42 44 46 48 50 52 Oct 25 Oct 28 Oct 31 Oct 25, 42.64 m, 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, Adjustments 42.20 m at ~7 cm/day
La Plata since Oct 25, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 25, 42.64 m, 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
Adjustments Watch Safe 398 399 400 401 402 403 Oct 25 Oct 28 Oct 31 Oct 25, 400.60 m, WatchOct 26, 400.60 m, +0 cm, WatchOct 27, 400.60 m, +0 cm, WatchOct 28, 400.60 m, +0 cm, WatchOct 29, 400.59 m, −1 cm, WatchOct 30, 400.59 m, +0 cm, WatchOct 31, 400.59 m, +0 cm, Watch 400.59 m
Cidra since Oct 25, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 25, 400.60 m, Watch
  • Oct 26, 400.60 m, +0 cm, Watch
  • Oct 27, 400.60 m, +0 cm, Watch
  • Oct 28, 400.60 m, +0 cm, Watch
  • Oct 29, 400.59 m, −1 cm, Watch
  • Oct 30, 400.59 m, +0 cm, Watch
  • Oct 31, 400.59 m, +0 cm, Watch
This week's 6 Daily Water Watches

Levels: AAA’s daily reservoir chart, Oct 25–31. Rain: gauges the U.S. Geological Survey (USGS) runs within 12 km of each reservoir. Rates and dates are arithmetic, not forecasts. How we report.

In context (787daily, from public data)

About this analysisOriginal 787daily analysis of seven days of validated reservoir readings and AAA notices · Report an error
Cite this

Source: 787daily, “Water Week in Review: Carraízo Down 3 cm, Oct 25–31”, Nov 1, 2026, https://787daily.com/news/2026-11-01-water-week-in-review-carraizo-down-3-cm-oct-25-31/

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Seven days of validated reservoir readings and AAA notices
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Every Water Week in Review

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Background

About Water Week in Review

The reservoirs' week in one read: which lakes rose or fell, how the bands moved, and what the rationing calendar did.

Published
Sundays
Source
Seven days of validated reservoir readings and AAA notices
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