Every fact below links to its source. Informational only. Ownership statements are limited to primary announcements and filings.
- Headquarters
- Pasadena, Calif., as listed by ENR in the 2026 Top 500 Design FirmsSource: enr.com/toplists/2026-top-500-design-fi…
- Founded
- 1966Source: tetratech.com/about
- Ownership type
- Publicly traded company, as described on the firm's own websiteSource: tetratech.com
- Employees
- More than 25,000 employees, per the firm's siteSource: tetratech.com/about
- Website
- tetratech.comSource: tetratech.com
Legal name, DBA and former names
- Tetra Tech, Inc.Source: tetratech.com
Identifiers (UEI, state registrations)
- SAM UEI LMRMKLLL3LG5 (as shown on the USAspending recipient record) and Texas TBPELS firm no. 3924.Source: usaspending.gov/recipient/9c8bd8f3-f7da-600d-94…
Offices
- Tetra Tech has 500 offices worldwide.Source: tetratech.com/about
Ownership type
- Publicly traded company, as described on the firm's own website.Source: tetratech.com
Employee count or band
- More than 25,000 employees, per the firm's site.Source: tetratech.com/about
Services and markets
- Tetra Tech provides technical and engineering services in water, environment, and sustainable infrastructure.Source: tetratech.com/about
Licences (board records)
- Texas TBPELS roster lists TETRA TECH INC (firm no. 3924, type NS, expires 2028-07-31)Source: tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
DOT prequalification
- TxDOT Active Precertified Firms lists TETRA TECH, INC. with 17 areas of certification, renewal status JANUARY 25, 2024 ( ACTIVE )Source: dot.state.tx.us/des/precert/precrt12.htm
Federal awards (contracts)
- USAspending recipient record TETRA TECH, INC. (Pasadena, CA), contract award obligations: FY2021 $751,575,962, FY2022 $842,678,977, FY2023 $1,005,309,834, FY2024 $950,716,035, FY2025 $714,194,574 (award types A to D; obligations as published, including modifications and negative adjustments)Source: usaspending.gov/recipient/9c8bd8f3-f7da-600d-94…
Public filings
- DOL Form 5500 filings, plan year beginning 2024-10-01, NAICS 541330: TETRA TECH, INC. PUERTO RICO RETIREMENT PLAN (ACK_ID 20260713113751NAL0000101667001, 84 active participants); TETRA TECH, INC. AND SUBSIDIARIES RETIREMENT PLAN (ACK_ID 20260713112350NAL0000113041001, 10,454 active participants)Source: dol.gov/agencies/ebsa/about-ebsa/our-ac…
Rankings and awards
- Listed in the ENR 2026 Top 500 Design Firms.Source: enr.com/toplists/2026-top-500-design-fi…
Sources of record
- https://www.tetratech.com/
- https://www.usaspending.gov/recipient/9c8bd8f3-f7da-600d-94c4-04e09c223b38-P/latest
- https://www.enr.com/toplists/2026-top-500-design-firms-1
- https://www.tetratech.com/about/
- https://tbpedownloads.s3-us-west-2.amazonaws.com/roster_firm.zip
- https://www.dot.state.tx.us/des/precert/precrt12.htm
- https://www.dol.gov/agencies/ebsa/about-ebsa/our-activities/public-disclosure/foia/form-5500-datasets
Ownership tag: Publicly traded. Profiles are informational, compiled from public sources linked above. Firms may request corrections. A listing is not an endorsement.
