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Water Week in Review: Carraízo Down 11 cm, Oct 11–17

Published Oct 18, 2026, 6:06 AM AST787daily · Original analysis

At a glance

  • Carraízo: 40.96 → 40.85 m (−11 cm) over 6 days, Safe band, 3.35 in of rain nearby in the final week
  • La Plata: 43.50 → 43.29 m (−21 cm) over 6 days, Adjustments band, 0.88 in of rain nearby in the final week
  • Cidra: 400.65 → 400.64 m (−1 cm) over 6 days, Watch band, 2.52 in of rain nearby in the final week
  • Readings of October 11–17: 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 (1.15 m for Carraízo, 2.79 m for La Plata) and the pace at which it is closing or opening.

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The week of October 11–17 on AAA’s reservoir charts: Carraízo down 11 cm, La Plata down 21 cm. The numbers first, then what they add up to.

Where the reservoirs stand

Control Adjustments Ajustes Watch Observación Safe Seguridad Spilling Carraízo, 40.85 m, Safe (Seguridad), +321 cm since Aug 7, −6 cm vs Oct 10 40.85 Carraízo La Plata, 43.29 m, Adjustments (Ajustes), −326 cm since Aug 7, −23 cm vs Oct 10 43.29 La Plata Cidra, 400.64 m, Watch (Observación), +47 cm since Aug 7, +3 cm vs Oct 10 400.64 Cidra Toa Vaca, 146.99 m, Watch (Observación), −65 cm since Aug 7, −6 cm vs Oct 10 146.99 Toa Vaca Río Blanco, 27.89 m, Safe (Seguridad), +223 cm since Aug 7, +32 cm vs Oct 10 27.89 Río Blanco Fajardo, 49.55 m, Safe (Seguridad), +196 cm since Aug 7, +136 cm vs Oct 10 49.55 Fajardo AAA: DRINKING WATER Carite, 542.55 m, Safe (Seguridad), +54 cm since Aug 7, +18 cm vs Oct 10 542.55 Carite Patillas, 65.52 m, Safe (Seguridad), +170 cm since Aug 7, −24 cm vs Oct 10 65.52 Patillas Guineo, 901.15 m, Safe (Seguridad), −127 cm since Aug 7, +38 cm vs Oct 10 901.15 Guineo Matrullas, 733.48 m, Safe (Seguridad), +49 cm since Aug 7, −21 cm vs Oct 10 733.48 Matrullas Guayabal, 103.63 m, Safe (Seguridad), +128 cm since Aug 7, +16 cm vs Oct 10 103.63 Guayabal Garzas, 736.05 m, Safe (Seguridad), +6 cm since Aug 7, −4 cm vs Oct 10 736.05 Garzas Guayo, 444.28 m, Safe (Seguridad), +149 cm since Aug 7, +99 cm vs Oct 10 444.28 Guayo Lucchetti, 172.38 m, Safe (Seguridad), +105 cm since Aug 7, +24 cm vs Oct 10 172.38 Lucchetti Loco, 69.88 m, Safe (Seguridad), +10 cm since Aug 7, +5 cm vs Oct 10 69.88 Loco Dos Bocas, 89.60 m, Safe (Seguridad), +4 cm since Aug 7, +8 cm vs Oct 10 89.60 Dos Bocas Caonillas, 251.81 m, Safe (Seguridad), +110 cm since Aug 7, +2 cm vs Oct 10 251.81 Caonillas Guajataca, 196.32 m, Safe (Seguridad), +38 cm since Aug 7, +5 cm vs Oct 10 196.32 Guajataca PREPA: HYDROELECTRIC Cerrillos, 166.60 m, Safe (Seguridad), −173 cm since Aug 7, +12 cm vs Oct 10 166.60 Cerrillos DRNA
Week 11 of the metro rotation (the San Juan area's rationing schedule). Where the 19 reservoirs stand as of Oct 17: 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.

16 of 19 reservoirs sit in the Safe band (Seguridad) or above, 2 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) have moved up a band; La Plata (Watch → Adjustments), Toa Vaca (Safe → Watch), Guineo (Spilling → Safe) have slipped down. The biggest move since Oct 10 is Fajardo, up 136 cm to 49.55 m.

Reservoir by reservoir

Carraízo

Oct 11 → Oct 17
40.96 → 40.85 mSafe band today
Net change
−11 cm1.8 cm a day on average
Best morning
+4 cmOct 13
Worst morning
−10 cmOct 12
Rain nearby, last 7 days
3.35 inmost on Oct 13 (1.33 in)
Above the Watch line
1.15 mmore than two months at this week's pace

La Plata

Oct 11 → Oct 17
43.50 → 43.29 mAdjustments band today
Net change
−21 cm3.5 cm a day on average
Best morning
+5 cmOct 14
Worst morning
−11 cmOct 18
Rain nearby, last 7 days
0.88 inmost on Oct 13 (0.74 in)
Above the Control line
2.79 mmore than two months at this week's pace

Cidra

Oct 11 → Oct 17
400.65 → 400.64 mWatch band today
Net change
−1 cm0.2 cm a day on average
Best morning
+1 cmOct 12
Worst morning
−2 cmOct 16
Rain nearby, last 7 days
2.52 inmost on Oct 11 (1.16 in)
Above the Adjustments line
0.41 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 −21 cm Oct 11 Oct 17 Carraízo, Oct 11, 40.96 m, ±0 cm since Oct 11Carraízo, Oct 11, 40.96 m, ±0 cm since Oct 11Carraízo, Oct 12, 40.86 m, −10 cm since Oct 11Carraízo, Oct 12, 40.86 m, −10 cm since Oct 11Carraízo, Oct 13, 40.90 m, −6 cm since Oct 11Carraízo, Oct 13, 40.90 m, −6 cm since Oct 11Carraízo, Oct 14, 40.94 m, −2 cm since Oct 11Carraízo, Oct 14, 40.94 m, −2 cm since Oct 11Carraízo, Oct 15, 40.85 m, −11 cm since Oct 11Carraízo, Oct 15, 40.85 m, −11 cm since Oct 11Carraízo, Oct 16, 40.87 m, −9 cm since Oct 11Carraízo, Oct 16, 40.87 m, −9 cm since Oct 11Carraízo, Oct 17, 40.85 m, −11 cm since Oct 11Carraízo, Oct 17, 40.85 m, −11 cm since Oct 11Carraízo −11 cm La Plata, Oct 11, 43.50 m, ±0 cm since Oct 11La Plata, Oct 11, 43.50 m, ±0 cm since Oct 11La Plata, Oct 12, 43.45 m, −5 cm since Oct 11La Plata, Oct 12, 43.45 m, −5 cm since Oct 11La Plata, Oct 13, 43.45 m, −5 cm since Oct 11La Plata, Oct 13, 43.45 m, −5 cm since Oct 11La Plata, Oct 14, 43.50 m, ±0 cm since Oct 11La Plata, Oct 14, 43.50 m, ±0 cm since Oct 11La Plata, Oct 15, 43.47 m, −3 cm since Oct 11La Plata, Oct 15, 43.47 m, −3 cm since Oct 11La Plata, Oct 16, 43.39 m, −11 cm since Oct 11La Plata, Oct 16, 43.39 m, −11 cm since Oct 11La Plata, Oct 17, 43.29 m, −21 cm since Oct 11La Plata, Oct 17, 43.29 m, −21 cm since Oct 11La Plata −21 cm Cidra, Oct 11, 400.65 m, ±0 cm since Oct 11Cidra, Oct 11, 400.65 m, ±0 cm since Oct 11Cidra, Oct 12, 400.66 m, +1 cm since Oct 11Cidra, Oct 12, 400.66 m, +1 cm since Oct 11Cidra, Oct 13, 400.66 m, +1 cm since Oct 11Cidra, Oct 13, 400.66 m, +1 cm since Oct 11Cidra, Oct 14, 400.66 m, +1 cm since Oct 11Cidra, Oct 14, 400.66 m, +1 cm since Oct 11Cidra, Oct 15, 400.66 m, +1 cm since Oct 11Cidra, Oct 15, 400.66 m, +1 cm since Oct 11Cidra, Oct 16, 400.64 m, −1 cm since Oct 11Cidra, Oct 16, 400.64 m, −1 cm since Oct 11Cidra, Oct 17, 400.64 m, −1 cm since Oct 11Cidra, Oct 17, 400.64 m, −1 cm since Oct 11Cidra −1 cm
Change since Oct 11, 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

Carraízo started the week at 40.96 m and ends it down 11 cm, at 40.85 m (Safe band), an average of 1.8 cm a day over 6 days. Of 6 day-to-day changes, 3 were falls and 3 rises. The sharpest fall was −10 cm on October 12. The biggest gain was +4 cm on October 13. It sits 1.15 m above the Watch line (the next band down). Gauges the U.S. Geological Survey (USGS) runs nearby recorded 3.35 in of rain in the final week. At the latest weekly pace the Watch line (39.70 m) is more than two months off; arithmetic, not a forecast.

La Plata started the week at 43.50 m and ends it down 21 cm, at 43.29 m (Adjustments band), an average of 3.5 cm a day over 6 days. Of 6 day-to-day changes, 4 were falls and 1 rises, with 1 unchanged. The sharpest fall was −11 cm on October 18. The biggest gain was +5 cm on October 14, the morning after 0.74 in of rain at the nearby gauges. It sits 2.79 m above the Control line (the next band down). Gauges USGS runs nearby recorded 0.88 in of rain in the final week. At the latest weekly pace the Control line (40.50 m) is more than two months off; arithmetic, not a forecast.

Cidra started the week at 400.65 m and ends it down 1 cm, at 400.64 m (Watch band), an average of 0.2 cm a day over 6 days. Of 6 day-to-day changes, 1 were falls and 1 rises, with 4 unchanged. The sharpest fall was −2 cm on October 16. The biggest gain was +1 cm on October 12, the morning after 1.16 in of rain at the nearby gauges. It sits 0.41 m above the Adjustments line (the next band down). Gauges USGS runs nearby recorded 2.52 in of rain in the final week.

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 11 Oct 14 Oct 17 Oct 11, 40.96 m, 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, Safe 40.85 m at ~2 cm/day
Carraízo since Oct 11, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 11, 40.96 m, 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
Adjustments Watch Safe 40 42 44 46 48 50 52 Oct 11 Oct 14 Oct 17 Oct 11, 43.50 m, 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, Adjustments 43.29 m at ~4 cm/day
La Plata since Oct 11, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 11, 43.50 m, 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
Adjustments Watch Safe 398 399 400 401 402 403 Oct 11 Oct 14 Oct 17 Oct 11, 400.65 m, WatchOct 12, 400.66 m, +1 cm, WatchOct 13, 400.66 m, +0 cm, WatchOct 14, 400.66 m, +0 cm, WatchOct 15, 400.66 m, +0 cm, WatchOct 16, 400.64 m, −2 cm, WatchOct 17, 400.64 m, +0 cm, Watch 400.64 m
Cidra since Oct 11, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.
Show the numbers
  • Oct 11, 400.65 m, Watch
  • Oct 12, 400.66 m, +1 cm, Watch
  • Oct 13, 400.66 m, +0 cm, Watch
  • Oct 14, 400.66 m, +0 cm, Watch
  • Oct 15, 400.66 m, +0 cm, Watch
  • Oct 16, 400.64 m, −2 cm, Watch
  • Oct 17, 400.64 m, +0 cm, Watch
This week's 6 Daily Water Watches

Levels: AAA’s daily reservoir chart, Oct 11–17. Rain: gauges USGS runs within 12 km of each reservoir. Rates and dates are arithmetic, not forecasts. How we report.

In context (787daily, from public data)

  • Cidra

    39,643Census estimate, 2020–20241809Founded36 sq mi (93.3 km²)Area
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 11 cm, Oct 11–17”, Oct 18, 2026, https://787daily.com/news/2026-10-18-water-week-in-review-carraizo-down-11-cm-oct-11-17/

Numbers from
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
Water

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