| Business | Phone |
| Beauchamps Septic Svc 19 Ash St, Londonderry 3053 | (603) 432-4453 |
| Derry Septic & Sewer Svc Inc 4 Cote Ln, Londonderry 3053 | (603) 432-7674 |
| Garside Sewer & Septic Svc 53 Griffin Rd, Londonderry 3053 | (603) 432-9300 |
| Granite State Sewer & Drain 65 High Range Rd, Londonderry 3053 | (603) 434-7213 |