| Business | Phone |
| Joseph Domenichelli & Assoc 1107 Investment Blvd # 145, El Dorado Hills 95762 | (916) 933-1997 |
| Kdl Engineering 4995 Golden Foothill Pkwy # 1, El Dorado Hills 95762 | (916) 933-5991 |
| Ardor Consulting 2908 Hutley Ct, El Dorado Hills 95762 | (530) 672-0638 |
| Matt Parisek Engineering 3140 Lennox Dr, El Dorado Hills 95762 | (916) 939-3525 |
| Streng Engineering-Surveying 3391 Thornhill Dr, El Dorado Hills 95762 | (530) 677-5906 |
| Whaley & Assoc 895 Embarcadero Dr # 208, El Dorado Hills 95762 | (916) 933-8787 |