How to Say "sewer" in Spanish
The Spanish word for “sewer” is “alcantarilla” — B1 level.

Examples
Ten cuidado, no dejes caer las llaves por la alcantarilla.
Be careful, don't drop your keys down the drain.
El agua de la lluvia fluye rápidamente hacia la alcantarilla.
The rainwater flows quickly toward the sewer.
Los trabajadores están limpiando la alcantarilla para evitar inundaciones.
The workers are cleaning the drain to prevent flooding.
Gender Check
This word is feminine, so always use 'la' or 'una'. For example: 'la alcantarilla' (the drain).
Using 'por' for movement
When something falls or moves through a drain, use the word 'por'. Example: 'El agua pasa por la alcantarilla' (The water goes through the drain).
Alcantarilla vs. Drenaje
Mistake: “Using 'el alcantarilla' instead of 'el drenaje' for general drainage.”
Correction: Use 'la alcantarilla' for the specific street structure, and 'el drenaje' for the general concept of plumbing or drainage systems.
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