How do you maintain your main water shutoff?
Updated August 2026
Maintaining the main water shutoff comes down to two habits: know exactly where it is and exercise it once a year so the valve does not seize shut. When a supply line bursts, this is the single valve that stops the flood, and a gate valve that has not moved in a decade often will not close when you finally reach for it. If yours is an old multi-turn gate valve, budget $150 to $350 to swap it for a quarter-turn ball valve you can shut in one second.
| Task | Interval | Effort |
|---|---|---|
| Locate the main shutoff and tag it | One time | 10 min · DIY |
| Show everyone in the house how to close it | One time | 5 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Fully close the valve, then reopen it | Yearly | 5 min · DIY |
| Check for drips at the stem and packing nut | Yearly | 2 min · DIY |
| Confirm water actually stopped at a faucet | Yearly | 2 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Replace a gate valve with a quarter-turn ball valve | As needed | $150–350 pro |
What neglect costs
A gate valve corrodes internally as it sits. The brass gate and the stem seize together and the rubber seat hardens, so the day a washing-machine hose lets go you spin the handle and nothing happens, or the stem snaps off in your hand. Meanwhile the flood keeps running at up to a few hundred gallons an hour. Leaving town without closing this valve is the worst case of all: see what an unattended leak costs, which routinely climbs into five figures once it reaches hardwood, drywall, and ceilings.
Leave these to a pro
The yearly exercise is a DIY job, but the valve swap is not. A plumber replacing a corroded gate valve with a modern quarter-turn ball valve charges $150 to $350 depending on pipe material and access, and it buys you a valve that closes with a 90-degree flick instead of a dozen slow turns. If your home has no interior main shutoff at all, only the buried curb stop the utility controls, have the plumber add one where the line enters the house. For how long these valves last before they seize, see the valve lifespan.
This whole checklist ships as reminders in OnOtto: every task above, on the right schedule for your home, snooze-proof.
Load this checklist as remindersFrequently asked questions
Where is my main water shutoff usually located?
In a basement or crawl space it is typically on the wall facing the street, within a few feet of where the line enters. In slab-on-grade homes across the South and West, look in the garage, a utility closet, or near the water heater. There is also a curb stop at the street meter that the utility owns, but you generally should not rely on that one for emergencies, since it needs a special long key most homeowners do not have.
How often should I test my main shutoff valve?
Once a year, plus before any long trip away. Turning it off and back on annually keeps mineral scale and corrosion from freezing the mechanism, so it still moves when a burst pipe puts you on the clock. Confirm it actually stopped the water by opening a faucet afterward. The shutoff test interval page walks through the full check.
Why won't my old gate valve fully shut off the water?
Gate valves fail by not sealing completely: the rubber seat hardens and the brass gate corrodes, so even fully closed a trickle gets past. If yours still weeps after you have cranked it shut, it is at the end of its life and due for replacement with a quarter-turn ball valve. See how long a shutoff valve lasts for the age thresholds.
Should I shut off the main water when I go on vacation?
Yes, for any trip longer than a weekend. A supply hose or valve can fail while you are gone and run unchecked for days, so shutting the main is free insurance. If a device needs water while you are away, close individual fixture stops instead, at minimum the toilet and washing-machine supplies. Set the water heater to vacation mode so it is not heating an empty or failing tank.