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Today’s Briefing

Infrastructure

Daily Water Watch: Carraízo at 40.58 Meters

Updated Sep 28, 2026 · 787 Daily · Original analysis

This morning’s 5:00 chart from the Autoridad de Acueductos y Alcantarillados shows Carraízo at 40.58 meters — down 5 centimeters from yesterday. La Plata is at 44.31 meters — down 8 centimeters from yesterday.

Updates

  • 9:05 AM: AAA reports the Cordillera plant out of service, with Ciales affected: AAA’s notice.

Service today

Day 52 of the metro rotation plan — interruptions paused since September 2, AAA has not cancelled the plan.

Most important now

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

Reservoirs

Carraízo: down 5 cm

Carraízo kept sliding. This morning’s chart puts it at 40.58 meters — down 5 centimeters from yesterday, in the seguridad band. The next line on the chart — into the observación band — sits at 39.70 meters, 0.88 meters below this morning’s reading. At AAA’s printed pace that is about 18 days away (straight-line date: 2026-10-16 — a projection, not a forecast; one wet afternoon moves it).

ajustes observación seguridad 37.0 37.5 38.0 38.5 39.0 39.5 40.0 40.5 41.0 Jul 31 Aug 29 Sep 28 Jul 31, 38.03 m, USGS gauge at 5 AM, ajustesAug 1, 37.94 m, USGS gauge at 5 AM, ajustesAug 2, 37.86 m, USGS gauge at 5 AM, ajustesAug 3, 37.80 m, USGS gauge at 5 AM, ajustesAug 4, 37.73 m, USGS gauge at 5 AM, ajustesAug 5, 37.71 m, USGS gauge at 5 AM, ajustesAug 6, 37.68 m, USGS gauge at 5 AM, ajustesAug 8, 37.58 m, USGS gauge at 5 AM, ajustes Aug 7, 37.64 m, −4 cm, ajustesAug 9, 37.53 m, −5 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, seguridadSep 26, 40.67 m, −1 cm, seguridadSep 27, 40.63 m, −4 cm, seguridadSep 28, 40.58 m, −5 cm, seguridad 40.58 m at ~5 cm/day Sep 23, 0.04 in of rainSep 24, 0.01 in of rain rain to 0.04 in
Carraízo since Jul 31, metres above sea level, shaded by AAA alert band, with daily rain from USGS gauges within 12 km. Data: AAA Monitoreo Diario; hollow points are the USGS gauge's 5 AM reading on days before AAA's record (from Aug 7).

Carraízo, September 28

Level today
40.58 mband: seguridad
Change since yesterday
-5 cm
To the observación line
0.88 mline at 39.70 m
At the current pace
about 18 daysstraight-line date: 2026-10-16

La Plata: down 8 cm

La Plata kept sliding. This morning’s chart puts it at 44.31 meters — down 8 centimeters from yesterday, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 3.81 meters below this morning’s reading. At AAA’s printed pace that is about 48 days away (straight-line date: 2026-11-15 — 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 Jul 31 Aug 29 Sep 28 Jul 31, 47.13 m, USGS gauge at 5 AM, observaciónAug 1, 47.05 m, USGS gauge at 5 AM, observaciónAug 2, 46.97 m, USGS gauge at 5 AM, observaciónAug 3, 46.88 m, USGS gauge at 5 AM, observaciónAug 4, 46.79 m, USGS gauge at 5 AM, observaciónAug 5, 46.72 m, USGS gauge at 5 AM, observaciónAug 6, 46.63 m, USGS gauge at 5 AM, observaciónAug 8, 46.46 m, USGS gauge at 5 AM, observación Aug 7, 46.55 m, −8 cm, observaciónAug 9, 46.38 m, −8 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, ajustesSep 26, 44.47 m, −9 cm, ajustesSep 27, 44.39 m, −8 cm, ajustesSep 28, 44.31 m, −8 cm, ajustes 44.31 m at ~8 cm/day Sep 23, 0.01 in of rainSep 24, 0.02 in of rainSep 25, 0.02 in of rainSep 26, 0.2 in of rainSep 27, 0.06 in of rain rain to 0.20 in
La Plata since Jul 31, metres above sea level, shaded by AAA alert band, with daily rain from USGS gauges within 12 km. Data: AAA Monitoreo Diario; hollow points are the USGS gauge's 5 AM reading on days before AAA's record (from Aug 7).

La Plata, September 28

Level today
44.31 mband: ajustes
Change since yesterday
-8 cm
To the control line
3.81 mline at 40.50 m
At the current pace
about 48 daysstraight-line date: 2026-11-15

The other rationing reservoir

Cidra, September 28

Level today
400.52 mband: observación
Change since yesterday
0 cm
To the ajustes line
0.29 mline at 400.23 m
At the current pace
holding

Outlook

What the numbers say

Carraízo’s decline has actually eased up: it’s losing 2.8 cm a day this week, a sharp slowdown from the 25.7 cm a day pace of the week before, though three straight lower mornings keep the direction pointed the same way. La Plata is moving the opposite direction — its fall has picked up to 6.8 cm a day, faster than the 4 cm a day of the prior week, extending a six-morning losing streak. Rain wasn’t a factor for either: gauges near Carraízo caught just 0.05 in over the week, and La Plata’s watershed saw only 0.31 in, not enough to interrupt either trend.

Cidra is the outlier, essentially holding steady with a 0.3 cm-a-day drift that the report treats as flat rather than a real decline, even after picking up 0.63 in of rain this week — the most of the three reservoirs. That steadiness matters because Cidra is sitting close to its lower line, and continued flatness would keep it from crossing anytime soon. For Carraízo and La Plata, the current daily paces are what’s used to project their next lower-band crossings — arithmetic projections, not forecasts — and La Plata’s accelerating slide is the more notable shift to watch heading into October.

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.

Lake levels

The USGS gauge at Carraízo read 40.57 meters at 5:45 AM. The USGS gauge at La Plata read 44.30 meters at 5:45 AM. The USGS gauge at Cidra read 400.52 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.

Elsewhere today

How we read the data

This is the 46th 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.

Numbers from AAA’s Monitoreo Diario chart of 2026-09-28, 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.