How to Shut Off Your Water During a Leak

A typical household water supply line delivers two to four gallons per minute under normal pressure. A burst pipe or failed supply hose behind a washing machine can release water at that rate or faster. In ten minutes, you could have 30 to 40 gallons on your floor, soaking into the subfloor and walls. Turning off the water in the first two to three minutes can be the difference between a minor inconvenience and a major renovation.

Moreno Valley homes built on slab foundations face a particular risk because there is no crawl space to contain or absorb water — it goes directly across the slab and into whatever is in its path. Acting fast is not optional in these situations.

If the problem is isolated to one fixture — a toilet, sink, or washing machine — start with the fixture-level shut-off valve before touching the main. These small valves are located on the supply line directly behind or below the fixture. Turning them clockwise (righty-tighty) stops water flow to just that fixture, leaving the rest of your home unaffected.

Toilet shut-offs are typically located on the wall behind and below the tank. Under-sink valves are in the cabinet below the sink on both the hot and cold lines. Washing machine valves are usually on the wall directly behind the machine. If the valve has not been turned in years, it may be stiff — apply firm, steady pressure rather than forcing it.

If you cannot isolate the problem to a single fixture, or if the leak is in a supply line inside a wall, the next step is the interior main shut-off. This valve controls all water entering your home from the street supply. In most Moreno Valley homes, it is located where the main supply line enters the house — often in a garage, utility closet, or along an exterior wall facing the street.

The valve is either a gate valve (a round wheel you turn multiple times to close) or a ball valve (a lever you turn 90 degrees to close). If you have a ball valve, closing it is fast — a quarter turn so the lever is perpendicular to the pipe. Gate valves take more turns and are slower to operate. Make sure everyone in your household knows where this valve is and has actually operated it before an emergency.

If the interior main shut-off is inaccessible, broken, or if the leak is between the meter and the house, you will need to use the exterior curb stop — the shut-off located near your water meter at the street. In Moreno Valley, water meters are typically housed in a concrete box set flush with the ground near the curb or sidewalk in front of the property. The lid is usually green or black plastic, sometimes metal.

Inside the box, you will see the meter and a shut-off valve. Operating this valve typically requires a special tool called a meter key or curb stop key — a long T-shaped wrench that reaches into the box. If you do not have one, your local hardware store carries them inexpensively. Your water utility can also shut off service at this point, though their response time during an emergency may be longer than calling a plumber.

Once the water is off, open the lowest faucet in your home — typically a hose bib outside or a faucet in a garage — to drain any remaining pressure in the lines. This reduces the amount of water that drips from the damaged section. Then document the situation with photos or video before any cleanup begins; this is valuable for insurance purposes.

If standing water is present, begin removing it with towels, a mop, or a wet-dry vacuum as quickly as possible. Move furniture and belongings off wet flooring. If drywall or baseboards have been soaked, use fans to start the drying process. Mold can begin developing in wet building materials within 24 to 48 hours in a warm Inland Valley home.

Once the immediate water flow is stopped, call a licensed plumber to assess and repair the source of the leak. Do not attempt to turn your water back on until the damaged section has been inspected, even if the leak appears minor. What looks like a small crack in a pipe can open into a much larger failure under pressure.

Moreno Valley Plumbing Pros provides emergency plumbing support and same-day service when available. Whether you are dealing with a burst pipe, a failed supply hose, or a cracked fitting behind a wall, our licensed and insured team can respond quickly. Call (207) 419-2600 the moment you have the water under control.