License is active
Source: Contractors State License Board (CSLB)
Licensed
Current and in good standing
Bonded
$25,000 surety bond
Insured
Workers' comp coverage on file
Clean record
No complaints or disciplinary actions
Hiring this contractor?
Get alerts if their license status changes.
You're monitoring this license!
We'll email you if the license status, bond, or complaint history changes.
Something went wrong
Is this your business?
Claim your profile to manage your listing.
Claim request submitted!
We'll be in touch at the email you provided to verify your identity.
Something went wrong
TETRA TECH BAS INC
- License Number
- 572017
- State
- California
- Status
- active
- Business Type
- Corporation
- Address
- 21700 COPLEY DR DIAMOND BAR, CA, 91765 Los Angeles County
- Phone
- (909) 860 7777
License Dates
Issued
06/28/1989
Expires
06/30/2027
Expires in 15 months
CSLB Last Updated
09/17/2025
License Classifications
Personnel & Officers
STIRRAT JEANNE
Officer
STIRRAT BRYAN ALEXANDER
Chief Executive Officer/President
Qualifier bond: SAFECO INSURANCE COMPANY OF AMERICA
SNYDER IRA ROBERT
Officer
SCHRANDT EDWARD
Officer
KNOWLES ARTHUR RAYMOND
Responsible Managing Employee
Qualifier bond: SURETY COMPANY OF THE PACIFIC
VUNAK FRED LAWRENCE
Responsible Managing Employee
Qualifier bond: INDEMNITY COMPANY OF CALIFORNIA
WILLIAMS JEFFREY MILES
Officer
MC GREGOR KELLY PAUL
Responsible Managing Officer
Qualifier bond: FIDELITY AND DEPOSIT COMPANY OF MARYLAND
Contractor Bond
Amount: $25,000
Company: FIDELITY AND DEPOSIT COMPANY OF MARYLAND
Bond #09318281
Effective: 01/01/2023
Workers' Compensation
Carrier: SAFETY NATIONAL CASUALTY CORPORATION
Policy #LDC4068970
Effective: 10/01/2024
Expires: 10/01/2026
CSLB designation: Workers' Compensation Insurance
Complaints & Disciplinary History
This reflects CSLB's bulk license data. For detailed complaint history including pending investigations, check the official CSLB record.
Verify this record on the official state licensing board
View on Contractors State License Board (CSLB) →Learn how to verify contractor licenses in California
California licensing guide →Data sourced from official state licensing board records. Always confirm critical information directly with the state board.
Verify Another Contractor
Homeowner Resources
Other Licensed A| C57| HAZ in DIAMOND BAR
LAMBARENA JORGE
JORGE LAMBARENA
License #759138 · CA
ZIP RENOVATION & AIR
License #762505 · CA
POST ELECTRIC COMPANY INC
License #768204 · CA
LIAO HSUEH YU
HSUEH YU LIAO
License #769733 · CA
ROOTER SHOOTER
TODD CLARK DBA ROOTER SHOOTER
License #800418 · CA