Questions to Ask a Well Driller Before You Hire
12 essential questions to ask when hiring a well driller. Compare contractors on experience, local knowledge, timeline, warranty, and references.
Key Takeaways
- Verify C-57 license, bond, and insurance before hiring
- Ask about local experience and references from your county
- Get written quote with depth estimate, timeline, permit handling, and payment schedule
- Red flags: vague answers, pressure to sign, no written contract
Hiring a well driller is a major decision—and the right questions can help you compare contractors and avoid costly mistakes. Use this checklist when interviewing C-57 licensed drillers for your project.
License and Credentials
1. Is your C-57 license active and in good standing?
Every well drilling contractor in California must hold an active C-57 Well Drilling Contractor license. Verify through the CSLB website or our directory, which pulls data directly from CSLB. Check for suspensions, complaints, or expired status.
2. Are you properly bonded and insured?
California requires a $25,000 contractor's bond. Confirm they also carry workers' compensation (or have a valid exemption). This protects you if something goes wrong.
Experience and Local Knowledge
3. How long have you been drilling wells in California?
Experience matters—especially in complex geology. Ask how many wells they've completed and over what period.
4. Have you drilled wells in my area or county?
Local experience is valuable. A driller familiar with your county knows typical depths, geology, permit requirements, and common challenges. Ask for examples of recent projects nearby.
5. Can you share references from projects in my area?
Request 2–3 references from similar projects (residential, agricultural, etc.) in your county. Follow up with a quick call.
Project Scope and Timeline
6. What depth do you expect, and how did you estimate it?
They should reference local well logs, geology, and experience. Be wary of anyone who gives a firm depth without explaining their reasoning—conditions can vary.
7. What's your estimated timeline from permit to completion?
Understand permit lead time (often 2–8 weeks) and drilling schedule. Ask how weather, equipment availability, and backlog affect timing.
8. Do you handle the permit application, or do I?
Most contractors submit permits on your behalf. Clarify what's included and whether permit fees are separate.
Cost and Contract
9. What's included in your quote?
Get a written estimate that covers drilling (per foot), casing, well development, and any extras. Ask about change orders if the well needs to go deeper than estimated.
10. What's your payment schedule?
Typical arrangements include a deposit and progress payments. Avoid paying the full amount upfront. See our how to choose a well driller guide for more on contracts.
Warranty and Guarantees
11. What warranty or guarantee do you offer?
Understand what happens if the well doesn't produce adequate water, if the pump fails prematurely, or if there are construction issues. Get it in writing.
12. What if we hit unexpected conditions?
Hard rock, dry zones, or other surprises can affect cost and timeline. Ask how they handle unforeseen conditions and whether the per-foot price can change.
Using the Answers to Compare
- Red flags: Vague answers, pressure to sign quickly, unwillingness to provide references, no written contract
- Green flags: Clear explanations, local references, written estimate, transparent about permits and timeline
Next Steps
Once you've narrowed your list, get written quotes from 2–3 contractors. Compare depth estimates, total cost, timeline, and what's included. Use our California Well Driller Directory to find licensed C-57 contractors in your area—search by county, city, or service area.