DON H MAHAFFEY DRILLING CO
California contractor license #139513 · Compton, Los Angeles County
License
- License number
- 139513
- Status
- Clear
- Classifications
- A General Engineering Contractor
- HAZ Hazardous Substance Removal Certification
- Business type
- Corporation
- Issued
- Jul 14, 1953
- Expires
- Aug 31, 2028
- Workers' compensation
- Workers' Compensation Insurance — Travelers Property Casualty Company Of America
- Contractor's bond
- $25,000 — Arch Insurance Company
- DIR public works registration
- Registered through Jun 30, 2027
From the California Contractors State License Board (CSLB) public license file, last updated Aug 14, 2026. Verify license #139513 on CSLB's License Check.
California public works
DON H MAHAFFEY DRILLING CO appears on 23 public works projects registered with the California Department of Industrial Relations, for 17 awarding bodies between 2020 and 2026.
| Date | Project | Awarding body | Role | Contract amount |
|---|---|---|---|---|
| Sep 15, 2026 | Armstrong Ave Ped Bridge & ND S PH2 PK2Traffic & signals | City of Tustin | Subcontractor | $7,574,039 |
| Apr 15, 2026 | WATMAUGH ROAD BRIDGE REPLACEMENTStorm drain & flood control | County of Sonoma – SPI _ Sonoma Public Infrastructure | Subcontractor | $7,112,953 |
| Dec 10, 2025 | 05-SLO-1-32.6Bridges & structures | California Department of Transportation (Caltrans) | Subcontractor | $6,785,921 |
| Jun 11, 2025 | Santa Anita Debris Dam Seismic StrengtheOther | County of Los Angeles Department of Public Works | Subcontractor | $20,467,900 |
| May 6, 2025 | Dwight Murphy Field Renovation ProjectParks, landscape & fields | City of Santa Barbara - Engineering Division | Subcontractor | $26,773,425 |
| Apr 3, 2025 | 12-Ora-605-R0.6/R1.6Electrical, low voltage & AV | California Department of Transportation (Caltrans) | Subcontractor | $24,892,103 |
| Dec 30, 2024 | I-105 ExpressLanes Construction ManagerOther | Los Angeles Metropolitan Transportation Authority | Subcontractor | — |
| Sep 5, 2024 | CENTENNIAL CORRIDOR EB58 TO NB99 LOOPOther | City of Bakersfield | Subcontractor | $27,300,297 |
| Aug 1, 2024 | LADYFACE GREENWAY PROJECT NIB #24-02BOther | City of Agoura Hills | Subcontractor | — |
| Jun 25, 2024 | E. Mountain Drive Bridge ReplacementBridges & structures | Santa Barbara County Public Works | Subcontractor | $4,693,218 |
| Oct 5, 2023 | Mercado Dr at Del Mar HeightsOther | City of San Diego Public Works Contracting Group | Subcontractor | — |
| Jul 17, 2023 | 57/60 Interchange Improvements ProjectOther | San Gabriel Valley Council of Governments | Subcontractor | — |
| Apr 3, 2023 | LAWA Intelligent Transportation SystemOther | City of Inglewood - Public Works | Subcontractor | — |
| Feb 12, 2023 | Perris Valley Pipeline Interstate 215 CrOther | The Metropolitan Water District of Southern California | Subcontractor | — |
| Jan 6, 2023 | 05-SCr-1-13.4/14.9Bridges & structures | California Department of Transportation (Caltrans) | Subcontractor | — |
| Jan 2, 2023 | I-15 French Valley Parkway ImprovementsOther | City of Temecula | Subcontractor | — |
| Dec 4, 2022 | La Paz Bridge & Road WideningBridges & structures | City of Mission Viejo | Subcontractor | — |
| Aug 1, 2022 | Citracado Parkway ProjectBridges & structures | City of Escondido - Department of Public Works | Subcontractor | — |
| Jan 14, 2022 | Construction of the State Route 71/91 InOther | Riverside County Transportation Commission | Subcontractor | — |
| Jul 30, 2021 | SR57/SR60 INTERCHANGE IMPROVEMENTS PROJEOther | San Gabriel Valley Council of Governments | Subcontractor | — |
| Nov 29, 2020 | East Mountain Dr. Bridge No. 51C-0396Bridges & structures | Santa Barbara County Public Works | Subcontractor | — |
| — | La Paz Bridge & Road WideningBridges & structures | City of Mission Viejo | Subcontractor | — |
| — | La Paz Bridge & Road WideningBridges & structures | City of Mission Viejo | Subcontractor | — |
Most recent 23 of 23. Contract amounts are the whole project's, as the awarding body reported them to DIR (reported since July 2024); a role is "Prime" when the awarding body registered the contractor on the project.
Awarding bodies it works for most
- City of Mission Viejo · 3 projects
- California Department of Transportation (Caltrans) · 3 projects
- San Gabriel Valley Council of Governments · 2 projects
- Santa Barbara County Public Works · 2 projects
- City of Inglewood - Public Works · 1 project
- The Metropolitan Water District of Southern California · 1 project
- City of Agoura Hills · 1 project
- City of Bakersfield · 1 project
- City of Tustin · 1 project
- Riverside County Transportation Commission · 1 project
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