Vòi nước đang rò nước.

Because the two instances of nước do different jobs:

• vòi nước = water tap / faucet
• rò nước = to leak water

So in the full sentence:

• vòi nước is the subject
• rò nước is the action

This kind of repetition is completely normal in Vietnamese. It may sound odd to an English speaker at first, but it is not redundant in Vietnamese.

Đang marks an action as in progress, similar to English is/are ...-ing.

So:

• rò nước = leaks / leak water
• đang rò nước = is leaking water

In this sentence, đang tells you the leaking is happening right now or is currently ongoing.

Vòi nước usually means faucet, tap, or sometimes water spout, depending on context.

Breakdown:

• vòi = spout, nozzle, tap-like outlet
• nước = water

Together, vòi nước is the common term for a water tap/faucet.

Vietnamese basic sentence order is usually:

• Subject + marker/adverb + verb + object

So here:

• Vòi nước = subject
• đang = ongoing-action marker
• rò = verb
• nước = object

That gives:

• Vòi nước đang rò nước.

This is very similar to English word order in The faucet is leaking water.

Yes. Here rò means to leak.

In this sentence, rò nước means to leak water.

A learner should also know that Vietnamese often uses related forms such as:

• rò = leak
• rò rỉ = leak / be leaking
• rỉ nước = leak water, seep water

Depending on region and context, you may hear different versions, but rò nước is understandable.

Yes, it is understandable and natural enough, but there are also other very common ways to say it.

For example:

• Vòi nước đang rò nước.
• Vòi nước bị rò nước.
• Vòi nước đang rò rỉ.
• Vòi nước bị rỉ nước.

The given sentence is fine, but in everyday speech many speakers might prefer a version with rò rỉ or bị depending on the situation.

Bị often marks that something is affected by an unwanted situation.

So:

• Vòi nước đang rò nước = The faucet is leaking water.
• Vòi nước bị rò nước = The faucet has the problem of leaking / is affected by a leak.

Using bị can make the sentence sound a little more like describing a fault or problem.

Sometimes yes, especially if the context already makes it obvious what is leaking.

• Vòi nước đang rò. = The faucet is leaking.

This is shorter and may sound more natural in conversation when everyone already knows you are talking about water. But rò nước is also perfectly clear and explicit.

Vietnamese usually does not require articles like a, an, or the the way English does.

So Vòi nước đang rò nước could mean:

• The faucet is leaking water
• A faucet is leaking water

The exact meaning depends on context.

If needed, Vietnamese can add words to make it more specific, but often it simply leaves articles out.

Not exactly.

• rò nước = leak water unintentionally
• chảy nước = water flows / runs

So if a faucet is working normally and water is coming out because you turned it on, that is chảy nước.

If water comes out because something is broken, that is rò nước.

This distinction is important.

A rough breakdown is:

• vòi — falling tone
• nước — rising tone
• đang — level tone
• rò — falling tone
• nước — rising tone again

A rough English-style guide is something like:

• vòi ≈ voy
• nước has no exact English equivalent, but the vowel is somewhat like oo-uh blended together
• đang ≈ zahng or dang with a soft Vietnamese đ
• rò in southern speech may sound more like an r, while in northern speech it may be closer to a z-like or rolled sound depending on the speaker

The tones matter a lot, especially for words like vòi, rò, and nước.

It can function as a verb by itself, but adding nước tells you exactly what is leaking.

Compare:

• Vòi nước đang rò. = The faucet is leaking.
• Vòi nước đang rò nước. = The faucet is leaking water.

So the object is optional if context is clear, but including it can make the meaning more explicit.

Usually vòi nước refers to a tap/faucet, but depending on context it can also refer more broadly to a water outlet, spout, or nozzle.

In everyday household contexts, though, most learners should understand it as:

• faucet
• tap

That is the most common interpretation.