Direct Answer
The best septic system installation & replacement contractors in San Diego are verified through California Contractors State License Board (cslb.ca.gov). Look for companies with 4.5+ Google stars, 50+ reviews, active CA license, and at least 5 years serving the San Diego area.
Full Explanation
Verify any San Diego contractor at California Contractors State License Board (cslb.ca.gov). Request proof of general liability insurance and workers' compensation. Ask for references from recent San Diego projects — local experience matters for understanding permit requirements and area-specific challenges.
Local Factors in San Diego
📍Verify license: California Contractors State License Board (cslb.ca.gov)
📍San Diego city permit office issues local permits
📍Check BBB Greater San Diego chapter
📍Require CA state license + local city license if applicable