Lead pipes by county in District of Columbia
Lead, galvanized and unknown service lines reported by the water systems serving each District of Columbia county.
| County | Lead | Galv. | Unknown | Systems |
|---|---|---|---|---|
| District Of Columbia | 16,935 | 220 | 13,427 | 3 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.