The Well Drilling Contractor License allows you to do the following work:
Install and repair water wells and pumps to provide a supply of uncontaminated water by:
Boring
Drilling
Excavating
Casing
Cementing
Cleaning
Install water conditioning equipment
Perform soil sampling
May not work on the following:
Installation of jet and submersible pumps
Electrical pump controls
Wiring from pump equipment to first readily accessible disconnect
Water line to storage or pressure tank
Work in this specialty may also require plumber certification or an electrical license (If both the electrical and plumbing trades are pursued this specialty is not allowed.)
How to Get the Well Drilling Contractor’s License in Washington?