Classification C-55
California C-55 — Water Conditioning Exam Prep
California Water Conditioning (C-55) applicants take two California exams: the shared Law & Business exam and the C-55 trade exam. We prep you for both.
Water Conditioning question bank is being built
The C-55 trade bank isn't published yet, so we're not charging for it. Law & Business — required for every classification — is ready today. Join the waitlist for C-55 and we'll email you the moment it's live.
Official resources
- Contractors State License Board (CSLB)
- Official California examination study guides
- PSI Services (exam administration)
ContractorPrepHQ is an independent study platform and is not affiliated with Contractors State License Board (CSLB) or PSI Services. Verify current exam requirements with the licensing authority.