California CSLB C-57 — Well Drilling Exam Prep

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Your access starts when you do: the days begin the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first).

Business & Law is 75% off with this classification. Add it only if you want it, for the same term: $24.75 for 30 days, $32.25 for 60 days, $42.25 for 90 days.

Official sitting

California CSLB C-57 Well Drilling exam at a glance

The California CSLB C-57 Well Drilling exam has a time limit of 3 hours 30 minutes, and it is closed book. CSLB also requires a separate Law and Business exam. Figures are from CSLB’s published exam information, checked September 26, 2026.

Time3 hours 30 minutes

Confirm question count, time, open-book rules, and passing score on the live board bulletin before you sit. We do not guarantee a passing result. Source: CSLB C57StudyGuide.pdf (on/after 11/1/2023), checked September 26, 2026. How we source exam facts

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What’s included

18,000+ word study guide

Worked calculations, code-section breakdowns, exam traps, a key-terms glossary and a 30/60/90-day plan.

5 full-length practice exams

Original questions weighted to match the topic mix of the real exam.

500 practice questions

Every one with a written explanation and the code section behind the answer.

Same study guide and four exams on every term. You are choosing how long you can log in.

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What’s on the California CSLB C-57 Well Drilling exam

CSLB’s study guide divides the C-57 exam into seven weighted sections. Water Well Drilling and Well Development carries the most weight at 24%, and together with Safety (21%) it makes up 45% of the exam. Geotechnical Borings and Environmental Wells and Water Distribution System Repairs are the smallest, at 7% each.

California CSLB C-57 Well Drilling exam sections and their share of the exam
SectionShare of exam
Planning and Estimating18%
Water Well Drilling and Well Development24%
Geotechnical Borings and Environmental Wells7%
Water Distribution System Installations12%
Water Distribution System Repairs7%
Water Well Rehabilitation and Destruction11%
Safety21%

The C-57 exam is closed book: no reference materials may be used during the test. Questions are multiple choice with four options, and there is no penalty for guessing, so leave nothing blank.

Source: CSLB Well Drilling (C-57) examination study guide. These weightings are the Board’s own, not our estimate. Contractor Pathway is independent and not affiliated with or endorsed by CSLB.

What this prep covers

  1. How this guide works
  2. Planning and Estimating — 18% of the exam
  3. Water Well Drilling and Well Development — 24% of the exam
  4. How C-57 — Well Drilling is actually scored
  5. California — who writes C-57 — Well Drilling
  6. Contractor method on C-57 — Well Drilling
  7. Clock discipline for C-57 — Well Drilling
  8. C-57 last-mile on-syllabus topics
  9. Geotechnical Borings and Environmental Wells — 7% of the exam
  10. Water Distribution System Installations — 12% of the exam
  11. Practice Questions
  12. Water Distribution System Repairs — 7% of the exam
  13. Water Well Rehabilitation and Destruction — 11% of the exam
  14. Key Reference Summary
  15. Exam Day Tips
  16. Key Code Sections the Exam Tests
  17. Safety — 21% of the exam
  18. Business & Law — tested on a separate exam
  19. Code reference — C-57, not C-36 and not Law
  20. Exam day — C-57 Well Drilling, not Law

Related California CSLB exams

Common questions about this exam

Do I also need the Law and Business exam in California?

Yes. CSLB requires every applicant to pass the separate Law and Business exam in addition to the C-57 trade exam. That exam has 3 hours 30 minutes. California CSLB Law & Business prep is 75% off when you add it to this classification for the same term.

How much practice does this prep include?

It includes 5 full-length practice exams and 500 practice questions in total. Every question has a written explanation naming the code section the answer comes from.

How long is the study guide?

The California CSLB C-57 Well Drilling guide runs to roughly 18,904 words in 20 sections, starting with “How this guide works” and ending with “Exam day — C-57 Well Drilling, not Law”.

How long do I get access?

Choose 30, 60 or 90 days at checkout. Your days do not start at checkout: they begin the first time you open the course (or 14 days after purchase, whichever comes first). Access works on any device, and you can retake every practice exam as often as you like. Days remaining are shown in your dashboard and you can extend at any time.

Is this an official California CSLB C-57 Well Drilling exam?

No. This is independent preparation material. It is not affiliated with or endorsed by any state licensing board or exam vendor, and it does not contain real exam questions. Always confirm current requirements with your licensing board.

About this prep

This prep is built specifically for the C-57 — Well Drilling examination and includes a 18,000+-word study guide written for this exam, 5 full-length practice exams and 500 practice questions, each with a written explanation.

How access works

You are paying for access length (30, 60, or 90 days). The study guide and four timed exams are the same on every term. Your days start the first time you open the course, not at checkout (or 14 days after purchase, whichever comes first), and access works on any device for that term.

Not affiliated with or endorsed by any state licensing board or exam vendor. For exam-preparation purposes only.