- A Friendly Cobra Co
- Around Town Plumbing Inc
- Catons Plumbing & Drains Htg
- Catonsville Professional Svc
- Daley Plumbing & Heating
- DLC Plumbing
- Drain Masters Sewer Svc
- GFL Plumbing & Heating
- James P Kruger & Assoc
- John E Ruth Co
- John's Discount Plumbing & Htg
- Marino Plumbing & Heating Inc
- Pipe Rite Plumbing & Heating
- Roto-Rooter Plumbing & Drain
- Spann Mechanical Plumbing
- Spartan Plumbing Heating & AC
- Standard Plumbing
- T M Moylan Plumbing & Heating
- Wayne Garrity
