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Infrastructure

Daily Water Watch: La Plata at 44.56 Meters

Published Sep 25, 2026 · 787 Daily · Original analysis

Day 49 of the metro rotation plan — interruptions paused since September 2, AAA has not cancelled the plan. This morning’s 5:00 chart from the Autoridad de Acueductos y Alcantarillados shows Carraízo flat at 40.68 meters, and La Plata at 44.56 meters — down 7 centimeters from yesterday.

This is the 44th entry in our daily chart check (yesterday’s is here), built the same way every morning — from AAA’s own numbers, read off its charts for our reservoir board.

Carraízo: holding

Carraízo held its level. This morning’s chart puts it flat at 40.68 meters, in the seguridad band. The next line on the chart — into the observación band — sits at 39.70 meters, 0.98 meters below this morning’s reading.

ajustes observación seguridad 37.0 37.5 38.0 38.5 39.0 39.5 40.0 40.5 41.0 Aug 7 Sep 1 Sep 25 Aug 7, 37.64 m, ajustesAug 9, 37.53 m, −11 cm, ajustesAug 10, 37.48 m, −5 cm, ajustesAug 11, 37.43 m, −5 cm, ajustesAug 12, 37.53 m, +10 cm, ajustesAug 13, 37.79 m, +26 cm, ajustesAug 14, 37.86 m, +7 cm, ajustesAug 15, 37.85 m, −1 cm, ajustesAug 16, 37.82 m, −3 cm, ajustesAug 17, 37.76 m, −6 cm, ajustesAug 18, 37.69 m, −7 cm, ajustesAug 19, 37.63 m, −6 cm, ajustesAug 20, 37.57 m, −6 cm, ajustesAug 21, 37.52 m, −5 cm, ajustesAug 22, 37.46 m, −6 cm, ajustesAug 23, 37.41 m, −5 cm, ajustesAug 24, 37.34 m, −7 cm, ajustesAug 25, 37.32 m, −2 cm, ajustesAug 26, 37.30 m, −2 cm, ajustesAug 27, 37.26 m, −4 cm, ajustesAug 28, 37.20 m, −6 cm, ajustesAug 29, 37.14 m, −6 cm, ajustesAug 30, 37.07 m, −7 cm, ajustesAug 31, 37.14 m, +7 cm, ajustesSep 1, 37.20 m, +6 cm, ajustesSep 2, 38.92 m, +172 cm, observaciónSep 3, 39.11 m, +19 cm, observaciónSep 4, 39.09 m, −2 cm, observaciónSep 5, 39.01 m, −8 cm, observaciónSep 6, 38.94 m, −7 cm, observaciónSep 7, 38.87 m, −7 cm, observaciónSep 8, 38.83 m, −4 cm, observaciónSep 9, 39.02 m, +19 cm, observaciónSep 10, 39.07 m, +5 cm, observaciónSep 11, 39.20 m, +13 cm, observaciónSep 12, 39.19 m, −1 cm, observaciónSep 13, 39.14 m, −5 cm, observaciónSep 14, 39.16 m, +2 cm, observaciónSep 15, 39.25 m, +9 cm, observaciónSep 16, 39.23 m, −2 cm, observaciónSep 17, 40.06 m, +83 cm, seguridadSep 18, 40.64 m, +58 cm, seguridadSep 19, 40.80 m, +16 cm, seguridadSep 20, 40.81 m, +1 cm, seguridadSep 21, 40.79 m, −2 cm, seguridadSep 22, 40.75 m, −4 cm, seguridadSep 23, 40.70 m, −5 cm, seguridadSep 24, 40.68 m, −2 cm, seguridadSep 25, 40.68 m, +0 cm, seguridad 40.68 m Sep 19, 0.03 in of rainSep 23, 0.04 in of rainSep 24, 0.01 in of rain rain to 0.04 in
Carraízo since Aug 7, metres above sea level, shaded by AAA alert band, with daily rain from USGS gauges within 12 km. Data: AAA Monitoreo Diario.

Carraízo, September 25

Level today
40.68 mband: seguridad
Change since yesterday
0 cm
To the observación line
0.98 mline at 39.70 m
At the current pace
holding

La Plata: down 7 cm

La Plata kept sliding. This morning’s chart puts it at 44.56 meters — down 7 centimeters from yesterday, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 4.06 meters below this morning’s reading. At AAA’s printed pace that is roughly 58 days out (straight-line date: 2026-11-22 — 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.

ajustes observación seguridad 40 42 44 46 48 50 52 Aug 7 Sep 1 Sep 25 Aug 7, 46.55 m, observaciónAug 9, 46.38 m, −17 cm, observaciónAug 10, 46.29 m, −9 cm, observaciónAug 11, 46.20 m, −9 cm, observaciónAug 12, 46.16 m, −4 cm, observaciónAug 13, 46.11 m, −5 cm, observaciónAug 14, 46.02 m, −9 cm, observaciónAug 15, 45.95 m, −7 cm, observaciónAug 16, 45.88 m, −7 cm, observaciónAug 17, 45.80 m, −8 cm, observaciónAug 18, 45.71 m, −9 cm, observaciónAug 19, 45.62 m, −9 cm, observaciónAug 20, 45.55 m, −7 cm, observaciónAug 21, 45.49 m, −6 cm, observaciónAug 22, 45.42 m, −7 cm, observaciónAug 23, 45.35 m, −7 cm, observaciónAug 24, 45.28 m, −7 cm, observaciónAug 25, 45.23 m, −5 cm, observaciónAug 26, 45.15 m, −8 cm, observaciónAug 27, 45.04 m, −11 cm, observaciónAug 28, 44.93 m, −11 cm, observaciónAug 29, 44.83 m, −10 cm, ajustesAug 30, 44.72 m, −11 cm, ajustesAug 31, 44.67 m, −5 cm, ajustesSep 1, 44.59 m, −8 cm, ajustesSep 2, 44.59 m, +0 cm, ajustesSep 3, 44.59 m, +0 cm, ajustesSep 4, 44.57 m, −2 cm, ajustesSep 5, 44.54 m, −3 cm, ajustesSep 6, 44.52 m, −2 cm, ajustesSep 7, 44.46 m, −6 cm, ajustesSep 8, 44.40 m, −6 cm, ajustesSep 9, 44.32 m, −8 cm, ajustesSep 10, 44.24 m, −8 cm, ajustesSep 11, 44.14 m, −10 cm, ajustesSep 12, 44.25 m, +11 cm, ajustesSep 13, 44.26 m, +1 cm, ajustesSep 14, 44.40 m, +14 cm, ajustesSep 15, 44.46 m, +6 cm, ajustesSep 16, 44.40 m, −6 cm, ajustesSep 17, 44.36 m, −4 cm, ajustesSep 18, 44.40 m, +4 cm, ajustesSep 19, 44.61 m, +21 cm, ajustesSep 20, 44.66 m, +5 cm, ajustesSep 21, 44.70 m, +4 cm, ajustesSep 22, 44.72 m, +2 cm, ajustesSep 23, 44.68 m, −4 cm, ajustesSep 24, 44.63 m, −5 cm, ajustesSep 25, 44.56 m, −7 cm, ajustes 44.56 m at ~7 cm/day Sep 19, 0.01 in of rainSep 21, 0.01 in of rainSep 23, 0.01 in of rainSep 24, 0.02 in of rain rain to 0.02 in
La Plata since Aug 7, metres above sea level, shaded by AAA alert band, with daily rain from USGS gauges within 12 km. Data: AAA Monitoreo Diario.

La Plata, September 25

Level today
44.56 mband: ajustes
Change since yesterday
-7 cm
To the control line
4.06 mline at 40.50 m
At the current pace
≈ 58 daysstraight-line date: 2026-11-22

What the numbers say

Carraízo has swung from a strong weekly rise to a mild daily slide, falling 2 cm a day this week versus 24.2 cm a day the week before — a sharp reversal in direction. Rain barely factored in, with just 0.08 in recorded at nearby gauges, most of it on September 23. If the current pace holds, the arithmetic points to the observación line in about 49 days, around November 13, though that’s a projection from this week’s rate, not a forecast of what’s coming. The other two reservoirs are holding closer to steady: both are essentially flat, with net movement this week sitting inside normal chart-reading noise rather than signaling any real shift.

La Plata’s picture is mixed — its weekly average looks flat, but it has posted three straight lower mornings for a cumulative 16 cm drop, showing a bit more downward persistence day-to-day than the average alone suggests. Cidra, meanwhile, saw the most rain of the three, with 0.59 in at nearby gauges this week and 0.3 in of that falling on September 23, yet its level barely moved. Neither reservoir shows the kind of acceleration seen at Carraízo, and both remain comfortably away from their respective lower band lines for now.

What to watch

  • Río Grande, Canóvanas and Loíza: whether AAA says in public that the east-side rationing is over, and posts that the Canóvanas filtration plant is back in operation.

The other rationing reservoir

Cidra, September 25

Level today
400.53 mband: observación
Change since yesterday
-1 cm
To the ajustes line
0.30 mline at 400.23 m
At the current pace
≈ 30 daysstraight-line date: 2026-10-25

Numbers from AAA’s Monitoreo Diario chart of 2026-09-25, read each morning for our reservoir board — where the levels, the bands, and the live rain gauges update daily. Rain figures are USGS gauges within 12 km of each reservoir (a proximity proxy, not a basin measurement). Day counts start 2026-08-08, when the metro rotation took effect. Straight-line dates are arithmetic, not forecasts. The analysis paragraphs are drafted by Claude from the computed figures and checked number-by-number against them before publishing.