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California contractor license

Tetra Tech Bas Inc

Tetra Tech Bas Inc of Diamond Bar holds California license 572017 (A General Engineering, C57 Well Drilling, HAZ Hazardous Substance Removal Certification). The CSLB file dated Oct 26, 2026 lists it as active.1 It expires Jun 30, 2027.

Licensed 37 years, longer than 95% of 101 active Diamond Bar general contractors.

Active

Tetra Tech Bas Inc, Diamond Bar

License
572017
Class
A General Engineering; C57 Well Drilling; HAZ Hazardous Substance Removal Certification
Expires
Jun 30, 2027
Bond
$25,000
Workers' comp
Insured to Oct 1, 2027

CSLB file dated Oct 26, 2026

What bond, insurance and workers' comp are on file?

Bond
$25,000Fidelity And Deposit Company Of Maryland, from Jan 1, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredSafety National Casualty Corporation, from Oct 1, 2024, to Oct 1, 2027

What work does this license cover?

Issued Jun 28, 1989.

Which other Diamond Bar businesses hold A General Engineering?

General Contractors in Diamond BarCalifornia general contractors

What should you check before hiring?

What to ask before you hire

  1. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  2. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  3. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  4. Ask who will be on site. If a crew works on your property, ask for proof of workers' comp. An exemption on file means the contractor told the CSLB it has no employees.
  5. Put it in a written contract: license number, price, start date and payment schedule. Check the license again on the day you sign.

If the license is lapsed

  1. Don't sign or pay a deposit until the CSLB shows the license active again.
  2. Ask the contractor why. For a bond or insurance lapse, ask for proof that the new bond or policy was filed with the CSLB, then check again.
  3. If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
  4. Check another contractor. California license lookup

Sources

  1. CSLB License Master (cslb.ca.gov, Oct 26, 2026)
  2. Contractors State License Board (CSLB)