ADU CITIES Contractor Directory

Tetra Tech Bas Inc

● Active — license status verified against CSLB public data as of November 6, 2026

☎ Call (909) 860-7777Verify this license at CSLB
CSLB license#572017
ClassificationsA — General Engineering · C-57 — Well Drilling · HAZ — Hazardous Substance Removal
Office of record21700 Copley Dr
Diamond Bar, CA 91765
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(909) 860-7777
Contractor bond$25,000 — Fidelity And Deposit Company Of Maryland
Workers' comp (CSLB record)Workers' Compensation Insurance — Safety National Casualty Corporation
Business typeCorporation
License issuedJune 28, 1989
License expiresJune 30, 2027

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Data source: CSLB public records as of November 6, 2026. License status can change at any time — verify live at CSLB before signing a contract.