Lead pipes by county in Connecticut
Lead, galvanized and unknown service lines reported by the water systems serving each Connecticut county.
| County | Lead | Galv. | Unknown | Systems |
|---|---|---|---|---|
| Fairfield County | 5,644 | 947 | 132,400 | 34 |
| Hartford County | 47 | 934 | 77,591 | 21 |
| Litchfield County | 11 | 390 | 25,364 | 28 |
| Middlesex County | 301 | 39 | 3,724 | 8 |
| New Haven County | 1,111 | 2,488 | 22,762 | 18 |
| New London County | 545 | 69 | 20,001 | 32 |
| Tolland County | 5 | 15 | 1,687 | 27 |
| Windham County | 329 | 337 | 2,591 | 9 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.