| Business | Phone |
| Energy & Environ Research Corp 1831 Carnegie Ave, Santa Ana 92705 | (949) 475-0435 |
| Environmental Engineering 501 Park Center Dr, Santa Ana 92705 | (714) 667-2300 |
| Aaron & Wright 1450 N Tustin Ave # 115, Santa Ana 92705 | (714) 542-3232 |
| Global Environmental Network 106 W 4th St, Santa Ana 92701 | (714) 479-1199 |