Lead Service Lines When Buying an Older Bethesda Home

If you're buying an older home in Bethesda, Chevy Chase, or Kensington, there's one pipe you can't see that deserves your attention before you remove your contingencies: the line that carries drinking water from the street into the house. On homes built before the 1960s, that pipe is sometimes lead — and the way you handle it in your offer can save you money, delay, and a lot of worry.

Here's the good news up front. Most homes in the WSSC Water system don't have a lead service line, and for the ones that do, there's now a program that replaces the pipe for free. But "free" comes with conditions, timing matters, and the wrong move during your inspection period can leave you holding a bill. This is the walkthrough I give buyers who ask.

What a lead service line is — and why older Bethesda homes have them

Your water service line is the pipe that runs from WSSC Water's main under the street to the plumbing inside your house. It's split into two parts: WSSC owns the section from the main to your property line, and you — the homeowner — own the "customer-side" section from the property line into the house.

A lead service line is one of those pipes made of lead. Lead can leach into drinking water, which is why the EPA and WSSC are pushing to get every one of them out of the ground.

Age is the biggest clue. WSSC banned lead as a service line material in 1954, so homes built after that are far less likely to have one. WSSC's own records show more than 97% of service lines in its system are not lead. But Bethesda, Chevy Chase, Somerset, and parts of Kensington are full of homes built in the 1920s through the 1950s — exactly the era when lead pipe was still in use. If you're under contract on a charming pre-1960 house, this is worth five minutes of due diligence.

How to check for a lead service line before you buy

You don't have to guess. WSSC Water publishes a "What's Your Pipe Type?" inventory map where you type in the property address and see the recorded material for both the public and customer-side portions of the line. Do this the moment you go under contract — it's free and takes a minute.

You'll usually see one of three answers:

• Not lead — copper, plastic, or another safe material. You can move on.
• Lead or galvanized requiring replacement (GRR) — the pipe qualifies for replacement.
• Material unknown — WSSC hasn't verified it yet. This is common on older homes and shouldn't scare you off, but it does mean you'll want it verified.

A standard home inspection does not confirm your service line material — inspectors look at the visible plumbing inside the house, not the buried pipe running out to the street. So don't assume a clean inspection report means the service line is clear. If the map shows lead or "unknown" on an older home, ask your inspector to note where the line enters the house (a lead pipe is dull gray and scratches to a shiny silver), and consider asking the seller to request WSSC verification.

This is the same due-diligence mindset that applies to radon testing when buying in Montgomery County and to lead paint disclosure on pre-1978 homes — different hazards, but the same principle: verify the things you can't see before your contingency window closes.

Who pays to replace a lead service line?

This is where buyers relax once they understand it. WSSC Water runs a service line replacement program built around the EPA's national push to remove lead pipes, and it's designed to make replacement free for the homeowner.

Two scenarios:

• The public side (WSSC-owned) is lead. WSSC replaces that portion at no cost to you.
• The customer side (your side) is lead or galvanized-requiring-replacement. WSSC's program will replace it for free too — but you have to enroll and use a plumber from the pre-qualified list (the program is administered by a contractor, Lead Free Group). If you hire your own plumber outside the program, there's no reimbursement.

That last point matters for a home sale. If a seller rushes to "fix" a lead line with their own plumber before closing to make a deal go away, they may have spent thousands on something the program would have covered for free. And Maryland has secured more than $105 million in federal funding to support this work, so the money behind the program is real.

Outside the program, replacing a customer-side line isn't cheap — trenching a new pipe from the property line to the house commonly runs a few thousand dollars, more if it has to go under a driveway or mature landscaping, which describes a lot of Bethesda lots. That's the number you're avoiding by using the program correctly.

How to handle a lead service line in your offer

The pipe itself is usually a solvable problem. The mistakes I see are about timing and process, not the pipe. Here's how to keep it clean:

1. Check the WSSC map the day you ratify. Don't wait until the end of your inspection period to discover an "unknown" line.
2. Make it an inspection-period item. Treat it like any other contingency in your contract — something you can investigate and respond to before your deadline, so you keep your leverage and your earnest money protected.
3. Ask the seller to enroll, not just replace. If the line qualifies, the cleanest resolution is often the seller (or you, after closing) enrolling in WSSC's free program rather than paying out of pocket. Get the timeline in writing.
4. If you'd rather it be resolved before closing, negotiate it the way you'd handle any other finding — a seller credit, a completed replacement, or an agreement to enroll. This is the same playbook as negotiating after a home inspection.

One more note for the long game: WSSC plans to work through its replacement list over the coming years, with the goal of removing all lead service lines by the EPA's 2037 deadline. So even a line that isn't touched before you close is on a track to be handled. Knowing that turns a scary-sounding word into a manageable line item.

What about the stretch between closing and replacement? If you're living in the home with a line that hasn't been swapped out yet, WSSC provides guidance on reducing exposure in the meantime — running the tap before drinking, using cold water for cooking and baby formula, and installing a filter certified to remove lead. It's a temporary bridge, not the fix, but it's worth knowing you have options while your spot in the program comes up. If anyone in the household is pregnant or you have young children, move the replacement higher on your priority list and factor that urgency into how hard you push during negotiations.

None of this should talk you out of a well-built older home. Pre-1960 houses in Bethesda and Chevy Chase are some of the most sought-after properties in the county precisely because of their location, lots, and character. A lead service line is just one of the boxes you check — and one of the easier ones to resolve once you know the steps.

If you're under contract on an older home and the pipe type came back "lead" or "unknown," that's exactly the kind of thing I help buyers work through before deadlines start stacking up. Reach out and we'll map out your next move together.

Pey Behin is a residential real estate agent serving the Washington, DC metro area, with a focus on Bethesda, Montgomery County, and Northern Virginia. He works with buyers and sellers who want clear strategy, data-driven pricing, and direct guidance throughout the transaction process.