| Business | Phone |
| Avista Technologies 133 N Pacific St # F, San Marcos 92069 | (760) 744-0536 |
| Cal Ecology 1145 Barham Dr # 132, San Marcos 92078 | (760) 233-8815 |
| Ecowater Systems 120 N Pacific St # D1, San Marcos 92069 | (760) 752-5111 |
| International Aqua-Mem Inc 826 Rancheros Dr, San Marcos 92069 | (760) 233-2988 |