GroundRosterMAINLINE PLUMBING & HEATING CO LLCLicensed
| Name | MAINLINE PLUMBING & HEATING CO LLC |
| Company | Mainline Plumbing & Heating CO LLC |
| License number | 1678 |
| License type | Pump Installer |
| License status | Active — NH DES Well Contractor roster |
| Based in | Londonderry, New Hampshire 03053 |
| Phone | (603) 437-9114 |
"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.
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What this license covers
- Pump installation: licensed to install, repair, and replace well pumps, pressure tanks, and the piping between the well and the building.
How to verify this license
We publish the license details exactly as they appear in New Hampshire's official licensing records; we do not vouch for the business itself. Before hiring, look up license #1678 directly with the state, confirm it is still active, and ask for a current certificate of insurance.
Source: NH DES - Well Contractors & Pump Installers, last checked 2026-08-16. Verify at the official source.
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