Tanko Well Drilling

Altaville · Calaveras County

Active license, no suspensions or flags in the state's file.

Disciplinary history (citations and accusations) is on the state's license page, linked below.

License: #423959
Status: Active
Classes: C-57 Well drilling contractor
Business type: Corporation
Issued: Jun 10, 1982
Expires: Jun 30, 2028

From the CSLB license file as of Nov 8, 2026. See this license on CSLB.ca.gov for its disciplinary history and to confirm before you hire.

Bond and insurance

Contractor's bond: $25,000 with American Contractors Indemnity Company, since Jan 1, 2023
Workers' comp: Insured with State Compensation Insurance Fund through Jan 1, 2027

People on this license

Martin Charles Callahan, officer (since 1988)
David Warren Eltringham, responsible managing officer (since 1998)
Jennifer Eltringham, officer (since 2013)
Rosalee Josephine Hayes, officer (since 2026)

The qualifier (RME or RMO) is the person whose experience the license is based on. Ask who will supervise your job.

Something wrong? This page mirrors the state's records and updates within a week of the state's file. For corrections, contact the CSLB or email admin@californiacontractorlookup.com.