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C-57 License: What It Means for Well Drilling in California

Learn about California's C-57 well drilling contractor license — what it covers, how contractors get it, and why it matters when hiring a well driller.

Key Takeaways

  • C-57 required for drilling, deepening, repairing, or destroying water wells in California
  • Issued by CSLB; verify active status, bond, and workers' comp
  • Covers casing, screens, cementing, pump installation; not geothermal boreholes

If you're looking to have a water well drilled, deepened, or repaired in California, the contractor you hire must hold a C-57 Well Drilling Contractor license. Here's everything you need to know about this specialized license classification.

What Is a C-57 License?

The C-57 is a specialty contractor classification issued by the California Contractors State License Board (CSLB). It specifically covers:

  • Drilling new water wells
  • Deepening existing wells
  • Repairing and maintaining water wells
  • Installing well casings and screens
  • Cementing well casings
  • Cleaning and rehabilitating wells
  • Destroying (properly sealing) abandoned wells
  • Installing pumps and water extraction equipment

The classification falls under the broader "C" specialty contractor category, which includes dozens of specific trades from electrical (C-10) to plumbing (C-36).

How Do Contractors Get a C-57 License?

Obtaining a C-57 license requires:

  1. Experience: At least 4 years of journeyman-level experience in well drilling within the past 10 years
  2. Examination: Passing both a trade exam (well drilling specific) and a law & business exam
  3. Financial requirements: A $25,000 contractor's bond and proof of workers' compensation insurance (or exemption)
  4. Background check: Fingerprinting and criminal background review

The experience requirement can be met through direct employment with a licensed C-57 contractor or through a combination of education and experience.

Why Does the C-57 License Matter?

Legal Protection

California law (Business & Professions Code Section 7028) makes it a misdemeanor to perform work requiring a contractor's license without one. If you hire an unlicensed well driller:

  • You have no recourse through the CSLB complaint process
  • The contractor may not carry insurance, leaving you liable for injuries
  • The work may not meet California Department of Water Resources standards

Quality Assurance

Licensed C-57 contractors have demonstrated:

  • Technical knowledge of well construction standards
  • Understanding of California water well regulations
  • Financial responsibility through bonding requirements
  • Accountability through the CSLB complaint process

Well Permitting

Most California counties require a well drilling permit before work begins. The permitting process typically requires the contractor to provide their C-57 license number. An unlicensed contractor cannot legally obtain these permits.

How Many C-57 Contractors Are in California?

As of early 2026, there are approximately 700+ active C-57 licensed contractors operating in California. These range from small owner-operators to large construction companies that hold multiple license classifications.

Many C-57 holders also carry additional classifications like:

  • A (General Engineering) — for larger infrastructure projects
  • C-61/D-21 (Machinery and Pumps) — for pump installation
  • C-42 (Sanitation System) — for related water system work

Verifying a C-57 License

You can verify any contractor's license through:

  1. Our directory: California Well Driller Directory — updated regularly from CSLB data
  2. CSLB website: cslb.ca.gov — the official source
  3. Phone: Call CSLB at 800-321-CSLB (2752)

When verifying, check that the license is:

  • Active (not expired or suspended)
  • Properly bonded ($25,000 minimum)
  • Free of unresolved complaints