What do you write on a Wilmette home's paperwork when the honest answer about the water line is "unknown"?
That is not a hypothetical. As of the Village's most recent public inventory, more than 300 Wilmette properties still show up on the municipal lead service line map with the material simply listed as unidentified. If you are selling one of them, or buying one, that gap does not resolve itself. It sits there until someone, usually an inspector with a flathead screwdriver and a refrigerator magnet, checks the pipe where it comes through the basement wall.
Wilmette has spent the last several years building a genuinely serious lead service line program, and the Village deserves credit for the transparency of it: a public dashboard, door-to-door inspections, an annual inventory filed with the state. What gets lost in the coverage of that program is a much narrower and more practical fact. The Village's commitment to fund lead line replacement applies to the segment of pipe the Village owns. The segment inside the property line belongs to the owner.
The Boundary Nobody Draws on a Listing Sheet
A water service line runs from the main under the street into your house. In Wilmette, that pipe has two owners. The Village owns and maintains the segment from the main to what's called the B-box, the shutoff valve typically located near the property line or the parkway. From the B-box into the building, the line belongs to the property owner.
This split matters because Wilmette's 2024 ordinance committing the Village to fund lead line replacement applies to the Village's own portion of the pipe. The Village's lead program materials are direct about this: replacing a lead service line in Wilmette is a shared responsibility between the Village and the property owner, because each side owns a different stretch of the same pipe. A homeowner whose service line tests as lead on the street side can have that section replaced by the Village at no direct cost. The section running from the B-box into their own basement is theirs to handle, and theirs to pay for, if it also turns out to be lead.
For a buyer working through inspection contingencies, or a seller filling out disclosure paperwork, this is the detail that actually changes the conversation. "The Village is replacing lead lines" is true and reassuring. "The Village is replacing the lead lines it owns, and my side of the property line is a separate decision" is the sentence that belongs in a listing conversation or an attorney review call.
What the Village Is Actually Replacing, and How Much Is Left
The numbers give some shape to how big this project is. As of the Village's 2024 draft compliance plan filed with the Illinois EPA, Wilmette had identified 1,790 lead or galvanized-requiring-replacement service lines out of 8,875 total water service connections in the Village, roughly one in five. Consumer sampling has not turned up detectable lead in the water leaving the Village's treatment plant. The risk, where it exists, comes from the pipe material between the street and the tap, which is exactly why the material identification project matters as much as the water quality testing does.
The Village has been reporting service line material to the state annually since 2020, and it is not guessing. Field crews go door to door, inspect the visible pipe near the water meter, and run a simple magnet test and a scratch test with a screwdriver to confirm the metal. Lead does not attract a magnet and scratches to a dull gray. Galvanized steel is magnetic. Copper scratches to a bright copper color. Any Wilmette homeowner can do this same check on their own line before they list or before they make an offer, and the Village's own guidance walks through exactly how.
Homes built before 1940 are the ones most likely to still have a lead connection, according to the Village's own water department FAQ. That is a useful rule of thumb for anyone shopping or listing in Wilmette's older housing stock closer to the lake and the historic core of the Village, though it is a starting point for a conversation with an inspector, not a substitute for one.
Two Deadlines That Don't Quite Agree
Illinois' Lead Service Line Replacement and Notification Act, in effect since January 2022, requires water systems statewide to inventory and eventually replace lead lines. One of the Village's own public FAQ pages states the law requires all communities to complete replacement by 2042. The Village's own draft compliance plan, filed with the state in 2024, sets a different internal target: full replacement by 2044, with the required work beginning in 2027 at a mandated rate of 6 percent of identified lead lines per year, or about 132 lines annually.
Neither number is wrong exactly. They are two different planning documents produced at different points, and the final version of Wilmette's plan is not due to the Illinois EPA until April 15, 2027. What the discrepancy tells a buyer or seller is that the completion date for this program is still being finalized, not locked in. Anyone using "the Village will have this done by [year]" as a selling point or a negotiating point should treat that year as a moving target until the final plan is adopted.
How a Replacement Actually Happens on Your Block
Wilmette's lead lines are not being replaced house by house on request. Most of the activity so far has ridden along with road and infrastructure work. When the Village or a contractor digs into a street for another project and the excavation reaches a lead service line, state law requires that line to be replaced as part of the same job rather than left in place. FJ Kerrigan Plumbing Co., a Wilmette-based contractor, has handled a portion of this work locally, using pit-launched directional drilling to pull new copper service lines in from the parkway with minimal disruption to the yard or driveway above.
The Village Board approved a 2026 road program that folds lead service line replacement into that year's construction schedule, alongside a newly established Green Homes Incentive Program. For a homeowner or a buyer, this means the timeline for getting your specific line addressed by the Village is tied less to a general schedule and more to whether your street happens to be part of that year's road or utility work. It is worth asking, before closing, whether a property's block is anywhere near an upcoming road project.
Checking a Specific Address Before You List or Offer
None of this requires guesswork. Wilmette maintains a public lead service line inventory dashboard, searchable by address, showing what the Village currently knows about both the public and private side of a given property's line. If a property shows as unknown, the Village's Engineering and Public Works Department can schedule an in-home inspection, or an owner can self-report using the Village's water service line survey. The department can be reached at 847-853-7500.
For a seller, checking this before listing means you are not answering an inspector's question for the first time during attorney review. For a buyer, it means an inspection contingency can be written with the actual facts in hand rather than a generic radon-and-lead-paint checklist. Illinois already requires attention to a home's plumbing condition as part of standard disclosure practice, and a documented lead service line on either side of the property line is exactly the kind of fact worth having answered before that conversation starts.
| Segment | Who owns it | Who pays for lead line replacement |
|---|---|---|
| Water main to B-box | Village of Wilmette | Village, per its 2024 ordinance |
| B-box into the building | Property owner | Property owner |
A Few Questions Worth Settling Before You List
Does a Village replacement on my street automatically fix my side of the line? No. The Village's replacement obligation covers only the segment it owns, from the main to the B-box. If the section running from the B-box into your house is also lead, that remains your responsibility to address separately.
My property shows as "unknown" material on the Village dashboard. What should I do before listing? Contact the Engineering and Public Works Department to schedule an inspection, or check the pipe yourself near the water meter using a magnet and a screwdriver, following the Village's own testing guide. Either way, resolve it before a buyer's inspector raises it first.
Is Wilmette's tap water actually unsafe? The Village's own testing has not found detectable lead in water leaving its treatment plant. The concern is localized to individual service lines and household plumbing, which is why the material of a specific property's pipe matters more than any citywide water quality number.
If you are weighing a sale or a purchase in Wilmette and want a clear read on how something like this fits into your timeline, Jacqueline Lotzof and the Lotzof Malk Residential team can walk through what a specific property's service line status means for your disclosure paperwork or your offer strategy, alongside the rest of what a North Shore transaction involves. Start the conversation before the inspection does it for you.
