Plumbing contractors in Antioch by the numbers
Antioch is home to 52 licensed plumbing contractors (C-36, CSLB September 2026), about 9% of the 594 contractor licenses based here.
Nearby in Contra Costa County: Concord (66), Richmond (42), Brentwood (38), Walnut Creek (35).
23% of Antioch's C-36 licensees hold more than one classification — most often C-42 Sanitation System Contractor (10%), B General Building Contractor (6%). Extra classifications can change how carriers rate your general liability and workers' comp, so list every license class when you quote.
Business structure: 40% sole owners, 44% corporations, 12% LLCs; median time licensed 7.2 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 Antioch 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 Antioch?
52 active C-36 licenses have a business address in Antioch (CSLB, September 2026); 35% carry workers' comp and 63% are filed exempt.
Do C-36 plumbers need workers' comp?
Yes if you have employees. With no employees you can currently file an exemption; beginning January 1, 2028, CSLB will require workers' comp for all active licenses under SB 1455, except joint ventures.