Turn the tap and nothing comes out? Whether it is the whole house or one fixture — and whether a valve is closed or the main is off — tells us where to look.
Written bySteven Lockhart·Reviewed byMiguel Lopez, Owner & Licensed Plumber, New Pro Plumbing (CSLB #974600)·Last reviewedAugust 2026 · 8 min readQuick Answer
If there is no water in the house, first check whether it is every fixture or just one, and whether a main shut-off valve is closed. Whole-house loss can be a closed main valve, a utility shut-off or main break, a pressure issue, or a failed supply line. One dry fixture is usually a local valve or clog. New Pro diagnoses no-water problems fast across West LA.
The first question with no water is scope: is every faucet dry, or just one? If the whole house is out, the cause is upstream — the main shut-off valve is closed, the water utility has shut off or has a main break, there is a pressure-regulator or supply-line problem, or (rarely on the Westside) a frozen line. If it is just one fixture, the cause is local: that fixture’s shut-off valve or a clog.
No water in house — No water repair is the diagnosis and restoration of water supply to a home — determining whether the loss is whole-house (main valve, utility, supply line) or a single fixture (local valve or clog).
Sorting whole-house from single-fixture is the first thing we — or you — do, and it points an emergency plumber straight to the cause.
Check the main shut-off valve is open and whether neighbors have water — it may be the utility.
If cold works but hot does not, it is the water heater, not the supply — see no hot water.
Work from the whole house down to the fixture.
Is every tap dry, or just one?
Confirm the main shut-off valve is fully open.
If they are out too, it is likely the utility.
A failed regulator can cut flow to the house.
One dry tap points to its valve or a clog.
We find and fix the cause fast.
No water after a leak or burst? If you shut the main for a burst pipe, that is why — and if water is coming in rather than out, see sump pump failure.
No water at all? We will find the cause fast — call us.
Get a Free QuoteJust as with a burst pipe, knowing your main water shut-off valve pays off when you have no water — because a closed or partially closed main valve is one of the most common and most overlooked causes. A valve bumped shut, a repair someone forgot to reopen fully, or a main valve that has failed can leave the whole house dry, and the fix is as simple as knowing where the valve is and confirming it is open. Locating yours on a calm day is worth the five minutes.
The scope check — whole house versus one fixture, and whether neighbors are affected — is the other half of a fast diagnosis. It instantly separates a utility problem you cannot fix from a household problem a plumber can. The U.S. EPA’s WaterSense program and local water utilities both encourage homeowners to understand their home’s water system, and knowing your main valve and how your supply is laid out turns a mysterious no-water morning into a quick, logical diagnosis.
When the cause is on your side of the meter — a valve, a pressure regulator, or a supply line — we diagnose and fix it as licensed work you can verify with the CSLB (#974600), permitting any supply-line repair through the Los Angeles Department of Building & Safety where required. Most no-water calls resolve quickly once the scope points us to the cause.
Scope points to the cause — and to who fixes it.
| Scope | Likely cause | Who fixes it |
|---|---|---|
| Whole house, neighbors too | Utility / main break | Utility |
| Whole house, only you | Main valve / regulator / line | We do |
| One fixture | Local valve / clog | We do |
Whether it is a valve, a regulator, or a supply line, we find and fix it — flat-rate, the way 24/7 emergency plumbing should be.
Many no-water causes are inexpensive to fix — reopening a valve, replacing a pressure regulator, or clearing a fixture. Cost rises only if a supply line has failed and needs repair or replacement. We diagnose the scope and cause first, then quote flat-rate.
Diagnose first, quote first — see how our emergency plumbing service prices flat-rate.
A homeowner wakes to no water from any tap and no idea why.
New Pro finds the main pressure regulator has failed, replaces it, and restores full flow to the house.
Water is back the same visit at proper pressure, and the homeowner knows where the main valve is for next time.
The Bottom Line
No water at all is unsettling, but the diagnosis is logical: whole house or one fixture, and is the main valve open? Whole-house loss with your neighbors dry too is the utility’s problem; on your side, it is usually a valve, a regulator, or a line — all fixable. Knowing where your main shut-off is helps here as much as in a leak.
Sudden whole-house water loss usually comes from upstream of your fixtures: a main shut-off valve that has been closed, a water utility shut-off or a water main break in your area, a failed pressure regulator, or a problem in the main supply line. Frozen pipes are a cause in cold climates but rare on the Westside. The first step is checking whether every fixture is dry and whether your main valve is open, which narrows the cause quickly.
Check with your neighbors. If they have also lost water, the problem is almost certainly on the utility’s side — a shut-off or a water main break — and you would contact the water company. If your neighbors have water but you do not, the problem is on your property: a closed main valve, a failed pressure regulator, or a supply-line issue that a plumber handles. This one check saves a lot of time in pointing you to the right fix.
When only one fixture has no water while the rest of the house is fine, the cause is local to that fixture. The most common reasons are that the fixture’s individual shut-off valve (under a sink or behind a toilet) has been turned off, a clogged aerator on the faucet tip, or a blocked or kinked supply line to that fixture. These are usually simple to diagnose and fix, since the problem is isolated to that one point rather than the whole system.
A pressure regulator (or pressure-reducing valve) is a device on the main line that lowers incoming water pressure to a safe level for your home’s plumbing. When it fails, it can either let pressure spike or, in some failures, sharply reduce flow so that little or no water reaches your fixtures. A failing regulator is a fairly common cause of a sudden whole-house drop in water or pressure, and replacing it typically restores normal flow.
Check the scope and the main valve. Try multiple faucets to see whether it is the whole house or one fixture, and locate your main water shut-off valve to confirm it is fully open — a partially or fully closed main valve is a surprisingly common cause. Then check whether neighbors have water to rule the utility in or out. Those three checks usually point to the cause, and they tell us exactly where to start when you call.
Written by the New Pro Plumbing content team and reviewed for technical accuracy by Miguel Lopez, owner and California-licensed plumber (CSLB #974600). Guidance follows U.S. EPA, CSLB, and LADBS sources where cited. Any figures reflect New Pro Plumbing's flat-rate practice and West LA conditions, not a quote — we confirm pricing in writing before any work begins.
Last reviewed: August 2026.
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