Lead pipes by county in Massachusetts
Lead, galvanized and unknown service lines reported by the water systems serving each Massachusetts county.
| County | Lead | Galv. | Unknown | Systems |
|---|---|---|---|---|
| Barnstable County | 5 | 148 | 19,682 | 21 |
| Berkshire County | 5 | 534 | 12,878 | 18 |
| Bristol County | 6,758 | 3,210 | 29,419 | 20 |
| Dukes County | 31 | 1 | 1,881 | 3 |
| Essex County | 1,272 | 3,396 | 60,527 | 35 |
| Franklin County | 0 | 30 | 3,401 | 14 |
| Hampden County | 50 | 489 | 29,924 | 18 |
| Hampshire County | 35 | 155 | 4,913 | 13 |
| Middlesex County | 12,203 | 1,590 | 53,638 | 58 |
| Nantucket County | 168 | 0 | 6,815 | 2 |
| Norfolk County | 4,436 | 2,049 | 49,188 | 33 |
| Plymouth County | 266 | 861 | 38,862 | 27 |
| Suffolk County | 3,253 | 290 | 9,154 | 5 |
| Worcester County | 80 | 422 | 29,685 | 61 |
Systems serving several counties are counted in each. Source: EPA SDWIS service line inventory, 2026 Q3.