| Business | Phone |
| Environmental Compliance 851 S Sunset Ave, West Covina 91790 | (626) 962-5682 |
| Global Environmental Inc 1520 W Cameron Ave, West Covina 91790 | (626) 962-4436 |
| Michael L Miller & Assoc 735 E Herring Ave, West Covina 91790 | (626) 337-1606 |
| Compliance Engineering 100 N Barranca St # 700, West Covina 91791 | (626) 858-2018 |