How to Tell if Your Water Service Line is Lead

June 17, 2025

The potential for lead contamination in drinking water presents a significant public health threat. Knowing how to find out if you have a lead service line might just be the most crucial home maintenance task you didn’t know needed to be performed. The pipes buried under your yard, that might be leaking a neurotoxin that could harm your family in their drinking water.

Understanding Lead Service Lines

What Exactly Is a Water Service Line?

A water service line is simply the pipe that connects your home to the municipal water main under the street. It is your home’s private drinking supply from the public water supply. Most residential water service lines are typically between 0.5 inches to 2 inches in diameter, depending on the home and local codes. The service line runs underground from the street to your house.

These service lines are not a single piece of pipe, but have distinct sections:

Public side runs from the water main to your property line
Private side runs from your property line to your house
There may be a small curve section of the line that connects the service line to the water main.
The service line includes two key valves: the corporation stop (located at the water main) and the curb stop (near your property line).

A Brief History of Lead in Plumbing

Lead pipes have been part of the water pipe scheme since the days of the Roman Empire, and it’s interesting to note that “plumbing” comes from the word for lead in Latin (“plumbum”). Lead was used in service lines in the United States from the late 1800s until approximately the mid-1980s.

The 1986 amendments to the Safe Drinking Water Act prohibited the use of lead pipes, solder and flux in plumbing, but lead plumbing was still being used in some places after this because of enforcement and local practice loopholes, and it didn’t force the replacement of the current lead pipes. Millions of homes built before 1986 could still be drinking through compromised lead service lines.

Why Lead in Water Matters

While it is generally understood that any level of lead exposure is harmful, the EPA has set an action level of 15 parts per billion (ppb) of lead in drinking water. This is not a “safe” level of lead, it is used as an action level to enforce regulation.

Lead is most dangerous for developing brains, therefore children under the age of 6 and pregnant women are the most susceptible populations to lead exposure. Even lower levels of lead exposure can result in decreased IQ levels, learning disabilities, and psychological issues in children.

For adults, lead exposure is linked to cardiovascular disease, kidney disease, and reproductive health issues. The CDC estimates that there are approximately 4 million households with children that were exposed to lead in drinking water, lead-based paint, dust, and soil.

“Lead is a poison,” the pediatrician who helped expose the Flint water crisis, Dr. Hanna-Attisha said. “We know that. We’ve known it for decades. This level of exposure can alter the life-force trajectory of an entire population of children.”

Step 1: Check Your Home’s Construction Timeline

When Was Your Home Built?

The age of your home provides your first major clue about whether you might have a lead service line. If your home was built after 1988 (when most states began enforcing the federal ban), you can probably feel fairly confident – there is a good chance your original service line is not lead.

However, for the millions of homes built prior to that, more research is needed.

To determine when your home was built:

Look at your property tax records (probably available online)
Check out the history of real estate listings on your home
Analyze any building permits filed with the local government
Ask your local historical society if you live in an old community

What Your Timeline Tells You

Your home’s age maybe be a good indicator of lead service lines:

Homes built before the 1920s: Very likely to have lead service lines
Homes built between the 1920s and 1950s: Good chance lead service lines
Homes built between the 1950s and 1986: Moderate to high change for lead service lines, depending on where you live
Homes built after 1988: Low chance for lead service lines, unless built on previously developed land.

Even as evidence mounts showing the health risks, various cities are still replacing lead pipes. Record what you learn about the age of your home and its implications because you will need to utilize the information at defining your inquiries more explicitly about what the city has done or not done.

Step 2: Contact Your Water Utility

Finding Your Water Provider

Next, you will want to contact your local water utility company. They are required to keep records of water service materials by the EPA. However, whether they have actually kept complete records is variable among different utility companies.

Usually, it will be easy to locate your water provider:

Check your water bill for contact information
Visit your city or county’s website
Call your local government offices

Questions to Ask Your Water Utility

When you call them, be sure you ask these questions specifically:

“What does your record indicate is the material in my service line?”
“Were lead service lines used in my neighborhood, or in the construction of houses my year was constructed?”
“Do you currently have programs to identify lead service lines or to help replace lead service lines?”
“Do you have lead testing for water?”

Be persistent. Sometimes the first person you speak with may not have access to the more detailed records.

Interpreting Your Utility’s Response

If your utility provides you with a definitive answer that you have a lead service line, congratulations, your investigation is complete (go directly to the action steps section). If your utility provides you with a definitive answer that you do not have a lead service line, you should ask for that verification in writing. Many utilities have poor record-keeping so you may not find the correct service connection so keep going with your visual inspection.

Step 3: Visual Inspection of Exposed Pipes

Finding Where Your Service Line Enters your House

Now we are going to do a little hands-on inspection. We want to find out where the pipe comes into your house from the street.

It typically comes in through:

Your basement wall or floor
A crawl space
A ground floor utility room

Start looking where the pipe comes in, close to your water meter or main shut off valve. There’s a good chance the service line enters on the side of your house that faces the street. You are looking for the tubing you identified in step 1 in the area that connects the pipe entry point to the shut off valve, known as the test area.

Visual Identification Methods

Now that you have located where the line is, you can start being a detective. Many types of pipe have distinguishing visual identification characteristics:

Lead pipe: dull gray color, just being a little softer than normal pipe. Also look for signs of irregular bumps and bulges
Copper pipe: distinctive reddish/brown/orange color
Galvanized steel: gray in color, can be hard on exterior, typically threaded connections
Plastic: usually white or gray, typically connected by clamps or glue

Lead pipe often has a bulge at the valve – known as a “wiped joint”, it might look like a snake that swallowed an egg. Huge red flag.

Pipe Material Testing Techniques

Here’s how you can test what your pipe is made from:

The scratch test: Use your key, or a coin, and gently scratch the pipe. Lead will scratch and have shiny silver where you scratched. Copper will show copper’s nice reddish color. Galvanized steel will be difficult to scratch.
The magnet test: Put a refrigerator magnet on the pipe. If it sticks, you likely have galvanized steel. Magnets will not stick to lead or copper.
The tap test: Tap the pipe with a hard object. Lead will give you a dull sound. Copper and steel will sound metallic and resonate.

Step 4: Pipe Testing Techniques

The Coin Scratch Test in Detail

The scratch test is the best DIY method for identifying pipe materials. Here’s how to perform it:

Take a clean, dry cloth and wipe the pipe clean.
Use a house key or a coin (I find a quarter works nicely).
Gently scratch a portion of the pipe that is about 1/4 inch long and large enough to be able to visibly observe the scratch.
Look closely at the scratch, taking care to note how easily you made the scratch, and the color of the freshly exposed pipe surface.

Lead scratches easily, about as easily as it is to scratch a penny. The metal exposed will be silver-bright upon scratching. However, if you had to apply a lot of pressure to create the mark, it is probably not lead.

The Magnet Test

Although using the magnet test does not allow you to test the type of pipe you have, it can work in conjunction with the scratch test to help you determine whether you have galvanized steel pipes, which is sometimes confused with lead pipes.

It is as simple as holding up a magnet to the pipe:

If it sticks well – then you have galvanized steel
If you cannot get it to stick at all – you have lead, copper, or plastic

Galvanized steel pipes are a risk in their own right, while they do not consist of lead, if they were ever connected to lead plumbing, the corroded surface could trap lead particles inside.

Capturing Your Results

Most importantly make sure you take clear photos and make sure they are well lit. You will need good photos of your pipe(s) and testing procedures if you need to consult with professionals or apply for assistance programs. Don’t forget to document the date, location and results of your test.

Step 5: Advanced Identification Methods

Professional Inspection Options

If, after checking, you are still unsure, it is time to call in the professionals. A licensed plumber who is familiar with older plumbing systems can give you a definitive answer.

Their specialized tools and experience mean they can identify pipe material easily, and can often visually identify lead pipes, rather than needing extensive testing.

Some water utilities will also perform inspections, sometimes free to residents in high-risk areas, where they will look for pipe material buried underground using specialized cameras or acoustic testing equipment.

Excavation and Underground Inspection

The most definitive (but also the most invasive) method of identifying pipe material is to expose the buried part of your service line. This means digging a small access hole, typically near your property line (the part of your plumbing visible during the inspection).

For community water systems, some will use a method called “hydrovacing” to expose pipes as safely as possible, using pressurized water to safely expose the piping without damaging it. Hydrovacing simply creates a small access point for inspection – without the destruction of a traditional excavation.

Interpreting Your Findings

Identifying a Lead Service Line

If you’ve done your homework and believe you have a lead service line, here’s how you would know for sure:

Your house was built prior to 1986
The utility has written records indicating lead
The pipe is gray, soft enough to scratch easily and non-magnetic
The pipe might exhibit a “wiped joint” or bulge
Water testing has detected lead in the water

If you’re able to identify three or more of these things, it’s fairly certain you have a lead service line.

Understanding a Partial Lead Service Line

There are a lot of homes with what’s called a “partial lead service line”, where only a portion of the service line is lead. In most cases, the public or private side has been replaced and the other still has lead.

Unfortunately, partial replacements can, in the short term, add lead exposure by disturbing the lead pipe. Disturbing can dislodge lead particles that may have been safely in place.

Additional Sources of Lead

Even if your service line is not lead, you may have other sources of lead in your plumbing system:

Lead solder to join copper piping (which was common before 1986)
Brass fixtures and faucets (which were sanctioned to contain lead before 2014)
Lead in galvanized steel pipes
Lead in well pumps or the components of private well systems

These other sources of lead usually release a much smaller amount of lead than a lead service line. But, this still means exposure and may pose an additional health risk.

Steps to take for Lead Service Lines

If you’ve confirmed or suspect you have a lead service line, take the following immediate action to limit exposure:

Purchase a certified water filter: Make sure to purchase a filter that is recommended for lead removal such as one that demonstrates compliance with NSF/ANSI Standard 53 for lead reduction. Filter options include:

Pitcher filters (leads in cost but must be replaced often)
Faucet mounted filters (low to moderate cost and easiest to use)
Under sink systems (high cost but more longevity)

Flush your pipes: The Centers for Disease Control and Prevention (CDC) specifically recommends, if you are going to drink water after it has sat in a rarely-used lead pipe, to run cold tap water for 5 minutes to flush any water that has been stagnant or sitting in pipes for hours.

Only use cold water for drinking and cooking purposes – hot water dissolves lead at higher rates than cold water does. Avoid making baby formula, coffee, or cooking with hot tap water.

When cleaning faucet aerators make sure to remove lead particulates that may have gotten trapped in faucet screens. Clean your faucet aerator weekly by unscrewing and rinsing.

Lead Service Line Replacement

There is no permanent substitute for a lead service line other than outright replacement. This requires:

The public and private side of the line to be completely replaced.
That a copper line or plastic pipe be the substitute material.
That a licensed plumber and/or utility crew performs the installation.

NEVER do a partial replacement yourself, this will only increase your lead exposure.

Conclusion and Resources

Finding out whether your water service line is lead can be intimidating at first, but it’s simple when broken down into steps. The peace of mind that comes from knowing your status—and taking necessary action—is well worth the effort.

You’re not alone in this. The Environmental Protection Agency estimates that 6-10 million of the home service lines in the U.S. have lead service lines to them. The good news is lead service lines, once identified and taken protective action against, can be eliminated (and hopefully replaced one day). Your family deserves safe water, so take action today!