| Business | Phone |
| Drinking Water Solutions 2695 Olympia Dr, Carlsbad 92008 | (760) 941-0914 |
| Environmental Management 7013 Via Padilla, Carlsbad 92009 | (760) 692-1081 |
| Coombs-Hopkins Co 5411 Avenida Encinas # 250, Carlsbad 92008 | (760) 931-0555 |
| Pathfinder Instruments 2075 Corte Del Nogal # X, Carlsbad 92011 | (760) 438-0890 |
| Nimbus Water Intl 5931 Sea Lion Pl, Carlsbad 92010 | (760) 603-0867 |