| Business | Phone |
| Geosyntec International 130 Research Lane #2, Guelph N1G 5G3 | (519) 822-2230 |
| Global Tox Intl Consultants 367 Woodlawn Rd W #6, Guelph N1H 7K9 | (519) 766-1000 |
| Golder Associates 367 Woodlawn Rd W, Guelph N1H 7K9 | (519) 821-7900 |
| Jtu Consulting 75 Wimbledon Rd, Guelph N1H 7V7 | (519) 836-3739 |
| Petrozyme Technologies Inc Rr 3 Stn Main, Guelph N1H 6H9 | (519) 767-2299 |
| Benazon Environmental Inc 32 Clarke St W, Guelph N1H 1S9 | (519) 763-4655 |
| Biorem Technologies Inc 7496 Wellington St W, Guelph N1H 6J3 | (519) 767-9100 |
| Rowan Williams Davies & Irwin 650 Woodlawn Rd W, Guelph N1K 1B8 | (519) 823-1311 |
| Vip Inc Rr 6 Stn Main, Guelph N1H 6J3 | (519) 823-1252 |
| Environmental Advisory Svc 2 Worton Ave, Guelph N1H 7C5 | (519) 763-2893 |
| Yesantyap Environment 36 University Ave W, Guelph N1G 1N4 | (519) 766-4031 |
| Canadian Network Of Toxicology Gordon St Floor 2, Guelph N1G 2W1 | (519) 837-3320 |
| Cuthill Scientific Assoc 497 Wyndham N, Guelph | (519) 821-7022 |
| Enpar Technologies Inc 449 Laird Rd, Guelph N1G 4W1 | (519) 836-6155 |
| Esg Intl 160 Research Lane #206, Guelph N1G 5B2 | (519) 829-2518 |
| Esg International 361 Southgate Dr, Guelph N1G 3M5 | (519) 836-6050 |