Published Sep 23, 2026, 6:05 AM AST787daily · Original analysis
At a glance
Carraízo fell 5 cm to 40.70 m (seguridad band) — 1.00 m above the observación line, roughly 20 days at the current pace
La Plata fell 4 cm to 44.68 m (ajustes band) — 4.18 m above the control line
Carraízo is rising — averaging 10.7 cm a day over the past week; 0.96 in of rain over the watershed this week
Day 47 of the metro rotation plan — interruptions paused since September 2, AAA has not canceled the plan; the plan began Aug 8; levels are read each morning from AAA’s own 5:00 AM chart for our reservoir board
Why this matters: The number that matters is the gap to the next band line: 1.00 m for Carraízo, 4.18 m for La Plata. Straight-line dates move every day — the daily check is the point.
Day 47 of the metro rotation plan — interruptions paused since September 2, AAA has not canceled the plan. This morning’s 5:00 chart from the Autoridad de Acueductos y Alcantarillados shows Carraízo at 40.70 meters — down 5 centimeters from yesterday, and La Plata at 44.68 meters — down 4 centimeters from yesterday.
This is the 42th 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: down 5 cm
Carraízo kept sliding. This morning’s chart puts it at 40.70 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, 1.00 meters below this morning’s reading. At AAA’s printed pace that is roughly 20 days out (straight-line date: Oct 13 — a projection, not a forecast; one wet afternoon moves it).
Carraízo since Jul 26, meters 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 23
Level today
40.70 mband: seguridad
Change since yesterday
-5 cm
To the observación line
1.00 mline at 39.70 m
At the current pace
≈ 20 daysstraight-line date: Oct 13
La Plata: down 4 cm
La Plata kept sliding. This morning’s chart puts it at 44.68 meters — down 4 centimeters from yesterday, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 4.18 meters below this morning’s reading.
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.
La Plata since Jul 26, meters 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 23
Level today
44.68 mband: ajustes
Change since yesterday
-4 cm
To the control line
4.18 mline at 40.50 m
At the current pace
months awaythe decline is very shallow
What the numbers say
Over the past week Carraízo has been rising an average of 10.7 cm a day. That is 3 straight mornings lower, -11 cm in all. Since the rotation began 46 days ago it has gained 312 cm, from 37.58 m. It sits 1.00 m above the observación line (the next band down), at 40.70 m in the seguridad band. If this week’s rise held, the level would climb into the desborde band above (line at 40.95 m) in about 2 days, around September 26. Nearby USGS gauges recorded 0.96 in of rain this week, most of it September 17 (0.92 in). After the 0.92 in on September 17, the next morning’s reading was +58 cm.
Over the past week La Plata has been rising an average of 5.3 cm a day. Since August 8 it has lost 178 cm, from 46.46 m. It sits 4.18 m above the control line (the next band down), at 44.68 m in the ajustes band. If this week’s rise held, the level would climb into the observacion band above (line at 44.90 m) in about 4 days, around September 28. Nearby USGS gauges recorded 0.61 in of rain this week, most of it September 17 (0.58 in). After the 0.58 in on September 17, the next morning’s reading was +4 cm.
Over the past week Cidra has been rising an average of 1.5 cm a day. Since August 8 it has gained 39 cm, from 400.15 m. It sits 0.31 m above the ajustes line (the next band down), at 400.54 m in the observación band. If this week’s rise held, the level would climb into the seguridad band above (line at 401.71 m) in about 78 days, around December 10. Nearby USGS gauges recorded 1.92 in of rain this week, most of it September 17 (1.49 in). After the 1.49 in on September 17, the next morning’s reading was +8 cm.
What to watch
Carraízo: whether the rise survives a dry week — this week’s gain came with 0.96 in of rain nearby.
La Plata: whether the rise survives a dry week — this week’s gain came with 0.61 in of rain nearby.
Cidra: whether the rise survives a dry week — this week’s gain came with 1.92 in of rain nearby.
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 23
Level today
400.54 mband: observación
Change since yesterday
0 cm
To the ajustes line
0.31 mline at 400.23 m
At the current pace
holding
Numbers from AAA’s Monitoreo Diario chart of Sep 23, 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 Aug 8, when the metro rotation took effect. Straight-line dates are arithmetic, not forecasts.
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.