Stop the water before anything else
You hear running water but see nothing, or a wall panel is darkening and bulging. Either way, the first job is closing a valve, not finding the leak.
Work through the valves from closest to farthest.
Try the fixture or branch valve
If the leak is near a sink, toilet or washer, the small valve under or behind it may isolate the line. This only helps when the pipe that burst is downstream of that valve.
Close the main shutoff at the house
Look at the front or side of the house, in the garage, or near the water heater for a wheel or lever valve where the line enters. Turn a wheel clockwise until it stops. With a lever, a quarter turn that leaves the handle lying across the pipe shuts the line off.
Use the meter valve if the house valve fails
Old valves seize or leak. The next stop is the shutoff at the meter box near the street, which usually needs a meter key or a large wrench. If you cannot turn it, call the water district rather than forcing it.
Drain the lines and protect the water heater
With the water off, open the lowest faucet in the house to relieve pressure and drain what remains. Switch off power to an electric water heater so the elements do not run dry.
In Calabasas the water supplier is Las Virgenes Municipal Water District. Its 24-hour line, (818) 251-2100, takes water and sewer emergencies, and that is the number to call if the meter-side valve will not close or the leak is on the supply side of your meter. Plumbing inside the house is yours, so a plumber fixes the pipe itself.
Make the power safe before you touch the wall
Water travels down the inside of a wall and finds outlets, switches and wiring boxes. Treat any wet wall with receptacles as live until proven otherwise. If you can reach the electrical panel without stepping in water, switch off the breakers feeding the wet area.
If the panel itself is wet, if you see sparks, or if a light fixture is dripping, stay out and call 911. Southern California Edison also lists 911 for electrical emergencies and 1-800-611-1911 for non-emergency safety concerns. Do not run a shop vacuum or extension cord through standing water.
Keep children and pets out of the room. A ceiling below the leak that sags can fall without warning, so stay clear of it.
Water already in the wall?
Call the 24/7 line once the valve is closed. Tell us which rooms are wet and we will plan extraction and drying.
Call (818) 337-2642Photograph before you move or cut anything
Take wide shots of every wet room, then close-ups of stains, bubbled paint, warped baseboards and the water source if you can see it. Add a short video walking through the damage.
Then move valuables, rugs and furniture legs off wet floors, and write down damaged items as you go. A phone note is enough. Documentation is for your insurer, and a crew cannot rebuild it later after the wall is open and the debris is bagged.
What your insurer will care about
A pipe that bursts without warning is the kind of event many policies respond to, while a drip left alone for months usually is not. Your policy wording and your insurer settle the question, and our crews have no say in claims.
CDI guidance tells policyholders to protect the home with temporary repairs, save every receipt, and understand that further damage left to spread may fall outside coverage. State rules also give an insurer 15 calendar days to acknowledge a claim notice. Closing the main valve and drying the structure are the kind of steps that count.
Where the water goes inside a wall
A burst supply line under normal pressure can put out many gallons in an hour. That water runs down the stud bay, soaks the insulation, and pools on the bottom plate. From there it moves under baseboards into flooring, or down into the room or crawl space below.
What looks like a stain the size of a dinner plate can be a wet cavity eight feet tall. A moisture meter and a thermal camera map the real boundary. The water comes from a clean supply line, which is IICRC Category 1 at the start. Left for a day or two it degrades toward Category 2 as materials hold it and bacteria grow.
Flood cuts: why drywall gets opened
A flood cut is a clean horizontal cut through the drywall, made above the highest wet reading, so the cavity can be opened to air. Wet gypsum paper and insulation hold water against the framing, and you cannot dry that from the outside alone.
Mold prevention hinges on speed, and EPA guidance sets a 24 to 48 hour target for drying. CDPH adds that porous materials left wet beyond a day or two can end up needing disposal. Crews pull wet insulation, set air movers and an LGR dehumidifier, and recheck readings daily.
Cuts near wiring or pipes are made shallow, with power off and a stud finder, never blind. Opening the wall also lets the plumber reach the break. Reach out to a crew offering emergency water removal early, since extraction and drying are what keep the cut small.
Who handles which job
| Task | Who handles it | Notes |
|---|---|---|
| Closing the valve | You, then the water district if needed | Do this first, before calling anyone else |
| Repairing the pipe | A licensed plumber | Restoration crews dry, they do not replace plumbing |
| Power safety | You, or an electrician | Call 911 for sparks or a wet panel |
| Extraction, drying, flood cuts | A water damage crew | Follows ANSI/IICRC S500 for water damage |
| Rebuild and paint | A licensed contractor | Done after readings match dry |
| Claim decision | Your insurer | Ask them about scope and timing |
After drying, water damage repair puts the walls back. California requires a CSLB license when labor and materials on a job total $1,000 or more, so a burst pipe repair will almost always fall under it. Ask any company whether its crews follow S500, and get the scope and price explained before work starts.
Water district numbers and a 2024 water line break
Las Virgenes Municipal Water District keeps a round-the-clock line for water and sewer emergencies, (818) 251-2100, and its office is at 4232 Las Virgenes Road in Calabasas. When the break sits between the main and your meter, or the meter valve will not turn, they are who you call, and a plumber is the call for pipes inside your walls.
Utility-side breaks can do real damage too. The break of a water line, reported just before 2 a.m. in January 2024, set off a landslide that affected at least 20 Calabasas homes in the area of Thousand Oaks Boulevard and Las Virgenes Road. The practical lesson is to learn where your own shutoff is in daylight, because you will not want to search for it at night.
Frequently asked questions
Where is my main water shutoff valve?
Common spots are on the front or side exterior wall near a hose bib, in the garage, or near the water heater. Some homes also have one in a utility closet.
Turn it once a year, since an unused valve can seize.
Do I cut the wall open myself?
Only if the plumber or restoration crew asks you to and the power to that area is off. Cutting blind can hit live wires or a second pipe.
How fast do I need to dry a wall after a pipe bursts?
EPA guidance sets 24 to 48 hours as the drying target, since mold generally does not grow in materials dried within that window.
That timing is why extraction and drying start before the repair is finished. Plumbing and drying can happen in the same visit.
The leak is before my meter, so who handles it in Calabasas?
Call Las Virgenes Municipal Water District at (818) 251-2100, the 24-hour line for water and sewer emergencies. They handle the supply side. Leaks past the meter, including pipes in your walls, are yours to fix with a plumber.
If water has already entered your home, nearby crews can also reach Agoura Hills and Westlake Village from the same dispatch.
Will my insurance pay for a burst pipe?
Sudden and accidental damage is often covered, but coverage depends on your policy, deductible and cause. Slow leaks tend to be excluded, and flood usually is too.
Ask your insurer before you sign a repair contract. Claim decisions rest with the insurer, never with the restoration crew.