Main Water Shut Off Valve: What to Know When Buying a House

When you buy a house, find the main water shut off valve line in your written inspection report. Then ask the inspector to show you the valve before you leave. InterNACHI’s Standards of Practice say the inspector inspects the “main water supply shut-off valve” and describes its location. The Standards also say the inspector isn’t required to operate shut-off valves. So a location line tells you where the valve sits. It doesn’t tell you that the valve closes.

The consequence is simple. A buyer who can’t find the main valve may not be able to stop water quickly during a leak. Reading the report’s location line as proof the valve closes leaves you with the same gap. There are no valve-turning steps here, and no repair instructions. This is general information for buyers, not plumbing or legal advice.

What Does the Inspection Report Say About the Main Water Shut Off Valve?

InterNACHI’s Standards of Practice say the inspector shall inspect the “main water supply shut-off valve” and the “main fuel supply shut-off valve.” The Standards also say the inspector shall describe “the location of the main water supply shut-off valve,” and “whether the water supply is public or private based upon observed evidence.”

The Standards also set out what the inspector isn’t required to do. The inspector is not required to operate “any shut-off valves or manual stop valves.” So a location line is a location. It isn’t a test. Ask the inspector whether the valve was operated.

The Standards define a home inspection as “a non-invasive, visual examination of the accessible areas of a residential property.” As a general principle, a visual inspection can report only what’s visible and accessible on the day. Picture a report that places the main valve behind a finished basement wall, or behind a stack of stored boxes. That’s a question to raise before closing.

Our licensed inspectors perform a visual examination of the structure and all major systems. We document every finding with photographs, so nothing is left to guesswork.

Where Are the Shut-Off Valves in a Philadelphia House?

For Philadelphia homes, the Philadelphia Water Department (PWD) says the supply valves are located on either side of your water meter. PWD also says it owns the water meter. And it says homeowners are responsible for keeping the meter and valves in good condition and accessible at all times.

PWD describes the street side too. The ferrule connects the water main to your underground water service pipe, which connects to the curb stop. Access to the curb stop must be maintained through its box and cover, usually located near the curb line in front of your home. Questions about the curb stop are for the Water Department.

For a problem on the property, PWD’s page says a licensed plumber must do the work, and that PWD is not responsible for your plumbing. That’s worth knowing before you close on a Philadelphia house.

PWD’s guidance applies to Philadelphia properties. If the house you’re buying sits in Bucks, Montgomery or Delaware County, ask the seller where the meter and the valves are. Ask your water provider too. Write down both answers before closing.

Should You Ask the Inspector to Show You the Valve?

Yes. Ask on inspection day, while the inspector is still in the house. It’s a direct way to leave knowing where the main valve is. The report’s location line is a written record. A look at the valve itself makes it concrete. Together they give you something to act on.

Our post on what a real inspection day looks like says the inspector walks through the house with you and shows you what they found and where the shutoffs live.

Our post for first-time buyers lists a question to bring with you: “Can you show me the main water shutoff, gas shutoff, and electrical disconnect before we leave?” Ask it out loud. Then write the answer where you’ll find it again.

Questions to Settle Before You Close

Put these questions in writing. A written answer is something you can act on later, and a written inspection report gives you something specific to bring to the seller or your real estate agent.

• Where does the report say the main shut-off valve is?
• Could you reach it, or is it blocked by storage or finishes?
• Was the valve operated during the inspection? Ask the inspector.
• What does the seller know about the valve?
• In Philadelphia, are the meter and its valves accessible? PWD puts their condition and access on the homeowner. Outside Philadelphia, who is your water provider, and where are the meter and the valves?

As a general rule, a valve that’s hidden, blocked, corroded-looking or unlabeled is a question for the seller and a licensed plumber. Questions about the agreement of sale belong with your real estate agent.

What Should Sellers Do About the Shut-Off Valve?

Keep the space in front of the main water shutoff clear. Our post on how sellers prepare a home for inspection asks sellers to keep clear space in front of the main water shutoff, the electrical panel and other equipment the inspector needs to reach.

In Philadelphia, PWD says homeowners are responsible for keeping the meter and valves accessible at all times. Clear access serves the inspection and the next owner.

Frequently Asked Questions About the Main Shut-Off Valve

Does a home inspector turn the main water valve off and on?

Per InterNACHI’s Standards of Practice, the inspector inspects the “main water supply shut-off valve” and describes its location. The Standards also say the inspector is not required to operate “any shut-off valves or manual stop valves.” A location line in your report isn’t a record that the valve was operated. If you want to know, ask the inspector.

Will the report say where the shut-off valve is?

InterNACHI’s Standards of Practice say the inspector shall describe “the location of the main water supply shut-off valve.” Our licensed inspectors perform a visual examination of the structure and all major systems, and we document every finding with photographs. Our reports are delivered within 24 hours. If you can’t find a location line, ask the inspector.

Who is responsible for the valves at a Philadelphia water meter?

The Philadelphia Water Department says it owns the water meter, and that homeowners are responsible for keeping the meter and valves in good condition and accessible at all times. PWD also says the supply valves are located on either side of your water meter. Outside Philadelphia, ask the seller and your water provider where the valves are.

What is the curb stop?

The Philadelphia Water Department describes it as part of the street-side service. The ferrule connects the water main to your underground water service pipe, which connects to the curb stop. PWD says access to the curb stop must be maintained through its box and cover, usually located near the curb line in front of your home. Questions about it are for the Water Department.

Does a home inspection check plumbing code compliance?

InterNACHI’s Standards of Practice list “compliance with codes or regulations” among the things the inspector is not required to determine. The Standards also define a home inspection as “a non-invasive, visual examination of the accessible areas of a residential property.” Under those Standards, the report speaks to what the inspector could see and reach.

Find the Valve Before You Need It

Inspection Professionals’ written report documents every finding with photographs and is delivered within 24 hours, so you can see the evidence for each finding rather than a summary.

Knowing where the valve is, and knowing what the report does and doesn’t say about it, gives you something specific to ask the seller before closing.

A full home inspection gives you a written report to have in hand while you ask.

If you’re buying in Bucks County, Montgomery County, Philadelphia or Delaware County, contact Inspection Professionals to talk through what a full written home inspection documents before you look for the main water shut off valve in a house you want to buy.