Where Is Your Main Water Shut-Off Valve?
Your main water shut-off valve sits where the service line enters the house, usually in the basement or utility area, according to Baltimore City DPW. Close a wheel-handle gate valve clockwise, which can take two or more full turns, or turn a lever-handle ball valve a quarter turn until it crosses the pipe. Use this valve, not the meter or valves in the curb vault, which belong to the City.
Can’t find it, or it won’t close? Call a plumber.
Close it in four moves
- Go to where the water line enters the house.
- Identify a wheel handle or a lever handle.
- Turn a wheel clockwise or a lever a quarter turn.
- Open a low faucet to confirm the water stopped.
Step 1 of 4
Go to where the water line enters the house
Start where the water service line comes through the foundation. Baltimore City DPW says that pipe usually enters the home in the basement or utility area, and the Institute for Business & Home Safety places the main valve at the meter or where the main line enters the house.
- Rowhouse: Baltimore City rules place meters at the curb line nearest the water main, so check the basement wall that faces the street first.
- Detached house: check the basement, crawl space or utility room wall where the line enters.
- Apartment: look for shut-off valves under sinks and behind toilets, and ask building maintenance where the unit or riser valve is.
Step 2 of 4
Identify the valve type
Two valve types cover most homes, per the City of Hamilton, Ohio water department and the San Francisco Public Utilities Commission:
- Gate valve: a round wheel handle that closes clockwise and can take two or more full turns.
- Ball valve: a lever handle that closes with a quarter turn, stopping when the lever sits perpendicular to the pipe.
Step 3 of 4
Close the valve without forcing it
Turn the handle steadily until it stops. Old gate valve stems corrode, and forcing them damages the packing and starts a leak, so the Apple Valley, Minnesota public works department advises against forcing the valve or its packing nut.
Valve won’t close? A main valve that doesn’t shut off the water is the homeowner’s to repair or replace. For an active leak in Baltimore City, call a plumber and report the leak to 311; the curb valve is DPW’s to operate, not yours.
Step 4 of 4
Open a low faucet to confirm the water stopped
Open a faucet on the lowest floor. Once the pipes drain, the flow stops if the valve closed fully; a steady stream means the valve is leaking through. Baltimore City DPW uses the same valve for its high-bill leak test: with the main closed, a meter that keeps registering use points to an underground leak on the property, as explained in the meter-to-house leak guide.
Can you turn off the water at the meter in Baltimore?
No, not in Baltimore City without DPW permission. City Code § 21-6 bars anyone without legal authority or a DPW permit from tampering with City-owned valves or any water meter, and § 21-12 makes a violation a misdemeanor with fines up to $1,000 per offense.
City rules install meters and meter vaults at the curb line nearest the water main unless DPW decides otherwise, and a 2021 Baltimore Sun report found most meters in underground concrete vaults. A current DPW page also mentions meters in basements, so some buildings differ. Either way, meters, meter vaults and service shut-off valves must stay accessible to DPW. Use the valve inside your home. When it will not stop the water, report the leak to 311 (City addresses) or follow DPW’s current guidance for its Baltimore County service area; any shut-off at the curb is done by DPW.
Turning the water back on
Open the main valve slowly: Western Municipal Water District in California warns that opening it too quickly damages pipes. Run a nearby faucet to push out trapped air. After a DPW service interruption, the utility advises running a sink or tub faucet until the water runs clear.
An electric water heater needs a full tank before its power goes back on; manufacturer A. O. Smith warns an element burns out otherwise. A tank that is leaking, rather than just switched off, is a job for a plumber who handles leaking water heaters.
A gas water heater also has a gas valve of its own, and a smell of gas is a different emergency: leave the building and call 911 or the gas utility. Repairs to the gas piping afterward are covered under gas line leak repair in Baltimore, with the price ranges in gas line repair cost.
Test the valve before you need it
Baltimore City DPW tells residents to know where their shut-off valve is and to check periodically that it works. Test it on an ordinary day, not during a flood; the same valve buys time when you spot a frozen pipe before it bursts. When a pipe does burst, closing this valve is step one of what to do when a pipe bursts.
Shut-off valve questions
Is it illegal to turn off the water at the meter in Baltimore City?
Without DPW permission, yes. City Code § 21-6 bars tampering with City-owned valves and water meters, and § 21-12 sets fines up to $1,000 per offense. Use the valve inside your home, and report a leak you cannot stop to 311.
Which way do I turn the main water valve to shut it off?
Turn a round wheel handle (gate valve) clockwise, which can take two or more full turns. Turn a lever handle (ball valve) a quarter turn until the lever sits perpendicular to the pipe.
What if my main shut-off valve won’t close?
Don’t force it; forcing a corroded gate valve damages its packing and causes leaks. A main valve that won’t shut the water off needs repair or replacement by a plumber. For an active leak in Baltimore City, also report it to 311; the curb valve is DPW’s to operate.
Valve stuck, leaking or missing?
A seized or leaking main valve gets replaced the same way a failed pipe section does: water shut off outside the house, old valve out, new valve in and pressure-tested. Speedy Plumbing Baltimore, a free 24/7 Baltimore plumber referral line, connects you with a licensed plumber for that work; it and every other pipe failure are covered on our round-the-clock Baltimore pipe repair page. A leak on the buried pipe before the valve, between the meter and the foundation, is covered under repairing the water line from the meter to the house. If you would rather talk it through first, call or request a plumber.
Sources
Checked 2026-09-13. Plumbing and safety guidance changes; follow your utility’s and insurer’s current instructions.
- Baltimore City DPW: DPW Wants to Know the Material of Your Water Service Line: https://www.baltimorecity.gov/publicworks/dpw-wants-know-the-material-of-your-water-service-line
- Baltimore City DPW: Cold Weather Tips (Jan 2026): https://www.baltimorecity.gov/publicworks/our-work/cold-weather-tips
- Baltimore City DPW: Protecting Your Water Service: https://www.baltimorecity.gov/publicworks/water-system-in-the-city/protect-your-water-service
- Baltimore City DPW: Water Bill Review Process: https://www.baltimorecity.gov/publicworks/our-work/customer-service/water-billing/higher-normal-water-bill/water-bill-review-process
- Baltimore City DPW: The Rules and Regulations for Water and Wastewater (PDF): https://codes.baltimorecity.gov/us/md/cities/baltimore/cobra/attachments/21.13-Water_and_Wastewater.pdf
- Baltimore City Code, Art. 24 § 21-6: https://codes.baltimorecity.gov/us/md/cities/baltimore/code/24/21-6
- Baltimore City Code, Art. 24 § 21-12: https://codes.baltimorecity.gov/us/md/cities/baltimore/code/24/21-12
- Baltimore Sun: Baltimore’s high-tech water system has lost millions (July 8, 2021): https://www.baltimoresun.com/2021/07/08/plagued-by-broken-equipment-baltimores-high-tech-water-system-has-lost-millions-of-dollars-because-thousands-of-customers-arent-being-billed/
- DPW bulletin: What Happens When a Water Main Breaks: https://content.govdelivery.com/accounts/MDBALT/bulletins/2c05fe5
- IBHS: Freezing and Bursting Pipes (hosted by City of Paola, KS): https://cityofpaola.com/DocumentCenter/View/1270/How-to-prevent-freezing-bursting-pipes
- City of Hamilton, OH: Operating Water Shut-Off Valves: https://www.hamilton-oh.gov/water-shut-off-valves
- San Francisco Public Utilities Commission: Home Water Shutoff Valve: https://www.sfpuc.gov/learning/emergency-preparedness/home-water-shutoff-valve
- City of Apple Valley, MN: Property Owner’s Responsibility (PDF): https://www.applevalleymn.gov/DocumentView.aspx?DID=532
- Western Municipal Water District: How to Turn Off Your Water: https://westernwaterca.gov/392/How-to-Turn-Off-Your-Water
- A. O. Smith: How to Turn a Water Heater On and Off: https://www.hotwater.com/info-center/how-to-turn-on-and-off-water-heater.html
Can’t stop the water?
Call Speedy Plumbing Baltimore to be connected with a local plumber; if the house valve won’t close, report the leak to 311 too. The line is answered 24 hours a day.
Call (410) 378-7792