| Business | Phone |
| A M Plumbing & Heating 484 Pulaski Rd, Greenlawn 11740 | (631) 261-4800 |
| Backflow Corp Of New York 62 Butterfield Dr, Greenlawn 11740 | (631) 261-8622 |
| Bergers Plumbing & Heating 1 Coleridge Pl, Greenlawn 11740 | (631) 757-8697 |
| Gerard Knox Plumbing & Heating 11 Railroad St, Greenlawn 11740 | (631) 261-8901 |