Why a written map helps
Most people only look for the main shutoff when water is already spraying. A written map, made on a calm day, records where every valve is, what it controls and whether it actually works. It also helps house sitters, older relatives and anyone else who might be home when a pipe lets go.
Walk the property with this sheet, a flashlight and a phone. Take a photo of each valve and note anything stiff, dripping or hidden behind storage. If a valve does not move with gentle pressure, write that down and have it checked rather than forcing it.
Shutoff map
| Valve | Location (be specific) | Controls | Handle type | Works? (Y/N) |
|---|---|---|---|---|
| Meter box | Whole property (utility side) | |||
| House main shutoff | Everything inside | |||
| Pressure regulator (if any) | Incoming pressure | n/a | ||
| Irrigation / backflow valve | Sprinklers | |||
| Water heater cold inlet | Water heater | |||
| Kitchen sink stops | Kitchen faucet | |||
| Bathroom sink stops | Each vanity | |||
| Toilet stops | Each toilet | |||
| Washing machine valves | Laundry | |||
| Ice maker / fridge line | Refrigerator |
How to fill it in
- Start at the street.Find the meter box near the curb or sidewalk and note its exact spot, such as 'left of driveway, under ivy'.
- Follow the line to the house.Note where the line rises out of the ground and where the house main shutoff sits.
- Work room by room.Check under every sink, behind every toilet, at the water heater and in the laundry.
- Test gently.Turn each fixture stop a little and back. Mark any that are stuck or leaking.
- Photograph and post.Attach photos, print the sheet and keep a copy near the main shutoff and on your phone.
Before you put the sheet away
Questions to bring up at your next plumber visit
- Should my old gate-style main shutoff be swapped for a quarter-turn valve?
- Are any fixture stops too corroded to trust?
- Is there a pressure regulator, and is it set correctly?
Common questions
How often should I update the map?
Whenever you replace a fixture, remodel or have plumbing work done, and at least once a year as a check that valves still turn.
What if I find no house main shutoff?
Some older homes lack an accessible one. A licensed plumber can add a valve where the service line enters the house.
Should children know where the shutoff is?
Older children and teens benefit from knowing where it is and when to call an adult or 911.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.