Does this NYC apartment have a lead water pipe?
The building is prewar, the ceilings are high, and the toddler moving in with you puts everything in her mouth. "No lead here" is the answer every seller gives, and it's usually said with confidence rather than knowledge. An NYC apartment has two separate lead risks, neither of which anyone can see by looking: the water service line running into the building, and the paint on the walls. Both are public record, and they live in two different places. Check both before you sign.
The pipe and the paint are separate problems
The water line belongs to the Department of Environmental Protection, which supplies the water and is on the hook for what carries it into the building. Local Law 65 of 2019 made DEP build a lot-by-lot inventory of what every service line in the city is made of and keep it current; the replacement program it runs off that inventory contacts owners by letter, on DEP's schedule rather than yours.
The paint belongs to Housing Preservation and Development, which enforces the Childhood Lead Poisoning Prevention Act, Local Law 1 of 2004. It requires owners of pre-1960 buildings to presume any paint is lead-based and to inspect and address problem surfaces wherever a child under six lives.
Two agencies, two statutes, and a clean record on one says nothing about the other. A building can clear one and fail the other, or fail both. No city page puts them side by side.
How much lead is still under the sidewalk
DEP's inventory classifies each recorded service line as confirmed lead, confirmed not lead, galvanized pipe downstream of a former lead line (which DEP treats as equally hazardous, since it can shed lead picked up from the pipe it replaced), or unknown. Across the whole city this August the inventory holds about 857k recorded lines. Lead is confirmed on about 118k of them, and another 3,050 are the galvanized, lead-equivalent kind. Together that is about one in seven.
The larger figure is the unresolved one. On roughly 114k lines, about 13% of the total, DEP has not determined the material at all. An unconfirmed line is not a clean result: DEP labels those possible lead lines and treats them that way until someone digs one up and looks, which is the posture worth borrowing.
Why this splits so unevenly by borough
Split those same 857k records by borough and the spread is wide:
| Borough | Share of recorded lines that are lead or lead-equivalent |
|---|---|
| Staten Island | 5.7% |
| Manhattan | 10.4% |
| Brooklyn | 12.3% |
| Bronx | 17.0% |
| Queens | 18.5% |
The split tracks the age of the housing stock rather than the borough, so Queens runs more than three times Staten Island's rate with the Bronx just behind. New York stopped allowing lead in a new service line in 1961, so a line laid before that date could easily have gone in as lead, and most of what went in was never dug up again. The older a borough's houses, the more lead is still under its sidewalks. A prewar building falls on the wrong side of that date by definition, and anything built since is almost never in question.
The paint problem in a pre-1960 building
A pre-1960 building carries a different exposure entirely, and it's the one HPD tracks. Under Local Law 1, an owner has to inspect a unit with a child under six every year and treat any peeling or chipped paint as lead until testing says otherwise. Skip the inspection, or fail one, and HPD writes a violation under Admin Code section 27-2056.
Citywide that provision has produced about 308k violations, roughly 92.2k of them still open. Half describe paint that actually tested positive for lead; about a third describe paint nobody tested, which the law presumes is lead because the building went up before the city banned it in 1960. The distinction matters less than it sounds like it should: HPD grades both on the same class scale it uses for a dead boiler or a structural crack, and 94% of them are graded class C, immediately hazardous. That is exactly the kind of open item that attaches to the building rather than to whoever caused it, which means it is waiting for the next owner. Read it regardless of who owns the place today.
Reading "unknown" and "not found" correctly
Neither record is a clean bill just because nothing bad turns up. A water line marked unknown is not a water line marked safe.
An apartment with no open lead violation is often just an apartment nobody inspected. The annual inspection is triggered by a child under six living there, so a unit that has housed adults for a decade has never been through one, and HPD rarely arrives on its own in a small building. The size of the building tells you more here than the name on the deed does: ownership type predicts upkeep poorly, and mid-size buildings run the worst violation records in the city whoever owns them.
What to check, and what to ask
Read both records side by side rather than asking anyone to characterize either one. Look up any NYC address to see the water-service-line material and the open lead-paint violation history together, on the same page.
If the line comes back lead or galvanized, ask who is paying for the replacement and when it is scheduled. DEP will replace an eligible line at no cost to the owner. It also decides which properties get the letter, so that work happens on the city's calendar rather than around your closing. If the line comes back unknown, price it like a positive until somebody verifies it. And if the building predates 1960 and a small child is moving in, ask whether this year's inspection has happened. That one is a legal obligation with a paper trail, and the paper trail is the part you can check.