Why the main shutoff matters most
Almost every water emergency gets worse by the minute until the supply is stopped. A burst line under a sink can push out a surprising amount of water before anyone can arrive, and that water soaks into drywall, cabinets, carpet pad and the slab edge. Closing one valve ends most of that damage right away.
In a typical single-story La Habra tract house, the water comes from the city meter near the street, runs underground to the house, and enters through a pipe that rises out of the ground along an exterior wall. The house-side shutoff is usually on that rising pipe. Older homes may have a round gate valve with a wheel handle; newer or repiped homes often have a quarter-turn ball valve with a lever.
Where to look first
| Location | What it looks like | Notes |
|---|---|---|
| Exterior wall near the front hose bib | Pipe rising from the ground with a wheel or lever valve | The most common spot on 1950s-70s slab homes |
| Garage wall or near the water heater | Valve on the main line before it branches | Common in homes that were repiped later |
| Meter box by the curb or sidewalk | Concrete or plastic lid over the meter | May need a meter key; this side belongs to the water utility |
| Apartment or condo utility closet | Individual unit valve or a building valve | Ask the manager or HOA where the unit shutoff is |
Closing the valve in an emergency
Move quickly but do not force anything so hard that the valve breaks.
- Turn it the right way.For a wheel handle, turn clockwise until it stops. For a lever, turn it a quarter turn so the handle sits across the pipe instead of along it.
- Check that it worked.Open a faucet inside. If water keeps flowing strongly after a few seconds, the valve may not be closing fully.
- Relieve the pressure.Open a faucet or tub spout at the lowest point of the house so water left in the lines drains there instead of at the leak.
- Shut off the water heater fuel.If the house will be without water for a while, set a gas water heater to pilot or turn off the breaker for an electric one so the tank is not heating with no supply.
Do this on a calm day
- Find the house shutoff and mark it with a tag or bright paint.
- Try turning it closed and open again so you know it moves.
- Locate the meter box and see whether you need a meter key.
- Find the small valves under each sink, behind each toilet and on top of the water heater.
- Show everyone in the household, including older children, where the main valve is.
- If the valve is seized or leaking at the stem, have a licensed plumber replace it before it is needed.
What to ask a plumber about your shutoff
- Is my main valve a gate valve or a ball valve, and should it be replaced?
- Is it safe to keep using this valve, or is it likely to fail when I need it?
- Would adding a second shutoff inside the garage make sense for my house?
- Does replacing the main valve need a permit from the city? (Check with the city if unsure.)
Common questions
Can I shut off the water at the street meter myself?
Many homeowners do in an emergency, using a meter key. The meter and the street side belong to the water utility, so do not tamper with the meter itself, and call the utility if anything there is leaking or damaged.
How long can I leave the main water off?
As long as you need to until the repair is made. Turn off the water heater's gas or power if it will be off for more than a short time, and remember that toilets will not refill.
My valve drips after I close it. Is that a problem?
A small drip from the valve stem is common on old valves. Note it and ask a licensed plumber to repair or replace the valve once the emergency is over.
General information for La Habra, not a quote or professional advice. In an emergency, call 911.