---
title: "tinaco"
translation: "The rooftop water tank."
type: "word"
category: "slang"
url: "https://consalsa.app/words/tinaco"
canonical: "https://consalsa.app/words/tinaco"
published: "2026-09-24"
updated: "2026-09-24"
author: "Andrey the Nomad"
site: "ConSalsa.App"
license: "https://consalsa.app/terms#ip"
---

# tinaco
URL: https://consalsa.app/words/tinaco
Translation: The rooftop water tank.
Pronunciation: /tiˈna.ko/
Category: slang
Region: Mexico
Register: everyday, practical, neutral
Variants: tinacos, Rotoplas, el tinaco de arriba
Literal meaning: Tinaco is a big tina - a large tub. Every flat roof in the city has one, and it is why your taps work at all.
Published: 2026-09-24

Quick answer:
- El tinaco is the water tank on the roof - the black plastic one on top of nearly every building in Mexico.
- In an apartment building water arrives from the street into an underground cisterna, a pump lifts it to the tinacos, and gravity feeds the taps. Plenty of houses have no cisterna at all - street pressure fills the tinaco directly.
- When water stops, ask first whether the whole building is dry or only you - many CDMX buildings give each apartment its own tinaco. And do not drink what comes out of it; everybody buys garrafones.

What it means:
- The black plastic tank on the roof. Look at any Mexican city from above and the dots you see on every building are these, and they are the reason water comes out of a tap in a place where the street supply is not continuous.
- For a tenant it is the thing that runs out. Se acabó el agua almost never means the city has none - it usually means your tinaco is empty and something upstream of it did not do its job.

Literal meaning:
- Tinaco is a large tina, a tub. The name is plain and the object is plain: a container that holds water until you need it.
- The reason it exists is the supply. Water reaches many neighborhoods on a schedule rather than continuously, so buildings store what arrives. The tinaco sits high on purpose - gravity does the work of pressurizing the taps, which is also why the shower on the top floor is often the weakest in the building: it has the least height between the tank and the showerhead.
- It is black for a plain reason too. Sunlight would grow algae in a translucent tank, so the standard one is black outside and white inside.

How Mexicans use it:
- Mostly in the middle of a problem. Se vació el tinaco, no sube el agua al tinaco, hay que revisar la bomba. If you rent here, these are among the most useful sentences you will learn.
- The first question is whether the whole building is dry or only you, because many CDMX buildings give each apartment its own tinaco. Whole building means the cisterna is empty or the shared pump has failed. Only you usually means your own tank did not fill - and the usual culprit is el flotador, the float valve, which sticks and either stops the tank filling or sends it overflowing down the front of the building. La llave de paso, your stopcock, is the other thing to check before calling anybody.
- Learn the rest of the building vocabulary while you are at it, because it all arrives in the same conversations: el boiler for the water heater, el gasero and el tanque estacionario for gas, el conserje for the caretaker and la administración for whoever actually decides things. Newer buildings sometimes skip gravity entirely and run on un hidroneumático, a pressure system.
- Tandeo is the word for a rationed supply schedule - water arriving on set days rather than continuously. In parts of the city it is a normal fact of life, and it is why the tinaco matters as much as it does.
- When the supply fails for long enough, somebody orders a pipa. The alcaldía supplies them free on request and a private one costs money but comes faster, and buildings coordinate either through la administración. A pipa can fill a tinaco directly by hose as well as filling the cisterna.
- And the thing nobody tells a newcomer: the water in the tinaco is not drinking water. Everybody buys garrafones - twenty-liter bottles from the corner store or from a truck that comes down the street - and the tinaco itself gets washed once or twice a year.

Common mistake:
- Assuming no water means the city has none. Far more often your own tank did not fill, and the cause is a stuck flotador or a closed llave de paso. When the pump really is the problem it is rarely a switch you can flip - a tripped pastilla, the electroniveles, a burnt-out motor, or a pump that ran dry and needs priming - and in most buildings you do not have access to it anyway.
- Drinking it. The tinaco stores municipal water in a plastic tank on a roof, and nobody here drinks that. Garrafones are what you buy, and in most of the city they are delivered to the door.
- Mixing up tinaco and cisterna when reporting the problem. They are at opposite ends of the same system - roof and basement - and telling a plumber the wrong one sends him to the wrong place.

Examples:
- Se vació el tinaco otra vez. — The tank's empty again.
- No sube el agua al tinaco, ha de ser la bomba. — The water isn't getting up to the tank, it's probably the pump.
- Ya pidieron una pipa para el edificio. — They've ordered a water truck for the building.
- ¿El departamento tiene tinaco propio o compartido? — Does the apartment have its own tank or a shared one?

Mini dialogue:
A: Oiga, no tengo agua desde en la mañana.
B: ¿Nada más usted o todo el edificio?
A: Creo que nada más yo. La vecina sí tiene.
B: Entonces es su tinaco. Aquí cada departamento tiene el suyo.
A: ¿Y por qué no se llenó?
B: Ha de ser el flotador. Ahorita subo a checarlo.

FAQ:
Q: What is a tinaco?
A: The water tank on the roof - the black plastic one on nearly every building in Mexico. It stores water and gravity-feeds the taps below.

Q: What is the difference between a tinaco and a cisterna?
A: Position and order. The cisterna is underground and receives water from the street; a pump lifts it to the tinaco on the roof. They are opposite ends of the same system.

Q: Why does every Mexican building have a water tank on the roof?
A: Because street supply is not continuous everywhere. Buildings store what arrives, and putting the tank high means gravity pressurizes the taps without needing a pump running all the time.

Q: My water stopped. What should I check?
A: First, whether the whole building is dry or only you. Whole building points at the cisterna or the shared pump. Only you usually means your own tinaco did not fill - check el flotador and your llave de paso.

Q: Can I drink the water from the tinaco?
A: No. Tap water is not treated as drinking water anywhere in Mexico, and a rooftop plastic tank is not the place to start. You buy garrafones - twenty-liter bottles, from the corner store or from a truck - and the tinaco itself gets washed once or twice a year.

Q: Why are tinacos black?
A: To block sunlight, so algae will not grow inside. The standard tank is black on the outside and white on the inside.

Q: What is a pipa?
A: A water truck. The alcaldía supplies them free on request; a private one costs money and comes faster. It can fill a cisterna or a tinaco directly by hose.

Q: What is tandeo?
A: A rationed supply schedule - water arriving on set days rather than continuously. In parts of CDMX it is normal, and it is why the tinaco matters so much.

Q: Why do people say Rotoplas?
A: It is a brand that became the generic word, like Kleenex. Plenty of people call any tank a Rotoplas whoever made it.

Related words: talacha, hoy-no-circula, chueco, quincena, aguas