Plumbing contractors in San Marcos by the numbers
San Marcos is home to 49 licensed plumbing contractors (C-36, CSLB September 2026), about 7% of the 723 contractor licenses based here.
Nearby in San Diego County: San Diego (488), El Cajon (130), Chula Vista (128), Escondido (122).
27% of San Marcos's C-36 licensees hold more than one classification — most often B General Building Contractor (14%), C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor (8%). Extra classifications can change how carriers rate your general liability and workers' comp, so list every license class when you quote.
Business structure: 41% sole owners, 51% corporations, 8% LLCs; median time licensed 7.7 years.
What carriers look at
For plumbers, underwriters focus first on: sewer backup and drain-cleaning work; and gas line work and related fire exposure. See the full coverage guide for plumbing contractors for limits, endorsements and workers' comp rules.
Get a quote
Asena Capital Insurance Services compares multiple markets for San Marcos contractors and requests additional insured endorsements for you when a contract calls for them. Call (858) 925-9555 or request a quote — only your name, phone and email are required. CA License #6008596.
Frequently asked questions
How many licensed plumbing contractors are in San Marcos?
49 active C-36 licenses have a business address in San Marcos (CSLB, September 2026); 35% carry workers' comp and 61% are filed exempt.
Is my drain camera or jetter covered?
Usually under an inland marine or tools-and-equipment policy, not general liability or auto.