| Business | Phone |
| Abc Roto-Rooter 456 Merritt St, St Catharines L2P 1P3 | (905) 934-3443 |
| Abc Roto-Rooter 13 Sterling St, St Catharines L2S 3T1 | (905) 687-3900 |
| A B's Plumbing 11 Faye Cres, St Catharines L2N 1N6 | (905) 934-7475 |
| Ampm Taps Plumbing 1688 Seventh St, St Catharines L2R 6P9 | (905) 688-0504 |
| Atlas Plumbing Inc 5 Tanera Cres, St Catharines L2M 7J7 | (905) 935-1768 |
| Hancock Plumbing & Heating 9 Summerton Pl, St Catharines L2N 5V9 | (905) 937-2871 |
| Ideal Plumbing 21 Woodburn Ave, St Catharines L2P 2W6 | (905) 682-3232 |
| Lakeside Construction 20 Parkhill Rd, St Catharines L2T 1V7 | (905) 680-8642 |
| Lincoln Mechanical Contractors 5 Seapark Dr, St Catharines L2M 6S5 | (905) 684-7486 |
| Nasser's Plumbing & Rnvtns 34 Geneva St, St Catharines L2R 4M4 | (905) 358-9595 |
| Penner Plumbing & Heating Ltd 3589 9th St, St Catharines L2R 6P7 | (905) 684-9921 |
| Peter Janzen Heating-Plumbing 12 Export Ave #1, St Catharines L2M 7L9 | (905) 688-0307 |
| Pisano's Plumbing & Heating 18 Parkhill Rd, St Catharines L2T 1V7 | (905) 227-2672 |
| Pullen, A F 125 Niagara St, St Catharines L2R 4L6 | (905) 685-7802 |
| Regional Plumbing & Htg Ltd 330 Vansickle Rd, St Catharines L2R 6P7 | (905) 684-6555 |
| Royal Flush Plumbing & Drain 134 Dufferin St E, St Catharines L2R 2A1 | (905) 687-1948 |
| T & A Plumbing & Heating 7 Franklin Blvd, St Catharines L2P 3E5 | (905) 704-1125 |
| C B Collison Plumbing 8 Silverdale Dr, St Catharines L2M 3N1 | (905) 646-0436 |
| C Bivand Plumbing & Heating 36 Spruce St, St Catharines L2R 1B5 | (905) 935-4451 |
| Castle Plumbing & Heating Inc 620 Welland Ave, St Catharines L2M 5V6 | (905) 682-8306 |
| Confederation Plumbing & Htg 700 Niagara St, St Catharines L2M 3R9 | (905) 937-4030 |
| D C Plumbing & Maintenance 18 Cambridge Ave, St Catharines L2P 1W7 | (905) 682-7611 |
| Ed's Pipe Works 118 Martindale Rd, St Catharines L2S 2X7 | (905) 984-6785 |
| Economy Plumbing 421 Lakeshore Rd E, St Catharines L2R 7K6 | (905) 935-0338 |
| Frank's Plumbing & Heating 92 Dalhousie Ave, St Catharines L2N 4X2 | (905) 984-0856 |