District of Columbia
We don't have lead pipe data for District of Columbia on this site -- and we're not going to guess or approximate one. Here's exactly why, so you're not left wondering if it's an error.
This isn't a missing-data problem -- it's a licensing one
Real, address-level lead service line data for District of Columbia does exist, and a government agency there already publishes it for free. But the source's own published terms explicitly say the data can't be used commercially -- and this site is a commercial product (it sells reports and monitoring subscriptions), so we're legally not able to host, resell, or build a lookup tool from it, no matter how good the underlying data is.
“...not for any commercial, legal or other use.”
— DC Water Service Line Materials Dashboard & open data portal, terms of use
You can still check your own address -- just not here
The restriction is only on commercial use by a third party like this site. If you live in District of Columbia and want to know if your own home has a lead service line, the government's own tool is free, direct, and has no restriction on you looking up your own address.
Check your own address on DC Water's official dashboard (free, direct) →