Diaz Yourman & Associates
Diaz Yourman & Associates is a privately held, California-based geotechnical engineering consulting firm founded in 1992, providing design, construction, environmental, and forensic geotechnical services as a subconsultant to public agencies and prime contractors on transportation, port, airport, water, and federal infrastructure projects.
- Company typePrivate
- Founded1992
- HeadquartersSanta Ana, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Diaz Yourman & Associates does
Diaz Yourman & Associates (DYA) is a privately held geotechnical engineering consulting firm headquartered in Santa Ana, California, founded in December 1992 by Jerry Diaz, PE, GE, and Allen Yourman, PE, GE. The firm specializes exclusively in geotechnical engineering and related geology, with service lines across Design (site and route evaluations, seismic design, foundation engineering, ground improvement, slope stability, pavement design, instrumentation), Construction (observation, testing, foundation installation oversight, claims evaluation), Environmental (EIR/EIS, Phase I/II site assessments, remediation, sustainability planning), and Legal/Forensic services. DYA operates as a subconsultant to prime contractors and design firms (Clark/McCarthy, Parsons/HNTB, Jacobs, Kimley-Horn, HDR, URS/AECOM) and as a direct contractor to public agencies, with named engagements including CHSRA Palmdale-LA, LAWA LAX Central Utility Plant, NAVFAC aircraft carrier berthing in Guam, OCTA SR-22, Port of LA San Pedro Waterfront, Port of Long Beach Gerald Desmond Bridge, and OC Sanitation Districts Groundwater Replenishment System.
The firm's revenue model is professional services on a project-by-project basis, with pricing quoted per scope and contracts typically structured as multi-year engagements on large public infrastructure programs. Go-to-market is enterprise field sales pursued via Statements of Qualifications (SOQs) distributed upon request, direct government agency relationships, and design-build teaming arrangements with major primes; small/disadvantaged business certifications (SBE, SBE-Micro, DBE, VSBE) across multiple California agencies provide set-aside access on public works. The customer base is concentrated in government infrastructure — federal (NAVFAC, USACE, FHWA-funded), state (CHSRA, Caltrans), regional (Metro, OCTA), port authorities (LA, Long Beach), and airport authorities (LAWA, JWA) — with named project values from approximately $32M to $1.4B at the overall program level, from which DYA earns a subconsultant fee share. The firm maintains 11–50 employees, is led by a multi-tier principal group including controlling principals Christopher M. Diaz (President) and V.R. Nadeswaran, and has executed a planned in-house ownership transition spanning from 2004 through at least 2020.
Diaz Yourman & Associates firmographics
Firmographics- Name
- Diaz Yourman & Associates
- Legal name
- Diaz Yourman & Associates
- Website
- https://diazyourman.com
- Company type
- Private
- Founded year
- 1992
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Diaz Yourman & Associates is a privately held, California-based geotechnical engineering consulting firm founded in 1992, providing design, construction, environmental, and forensic geotechnical services as a subconsultant to public agencies and prime contractors on transportation, port, airport, water, and federal infrastructure projects.
- Ownership category
- akta.pro rank
Diaz Yourman & Associates industry classification
Industry- Product category
- Geotechnical Engineering Consulting
- NAICS
- Engineering Services (541330), Architectural, Engineering, and Related Services (5413), Environmental Consulting Services (54162)
- SIC
- Services-Engineering Services (8711), Services-Engineering, Accounting, Research, Management (8700)
- akta.pro primary industry
- Geotechnical Design, Engineering & Consulting (Analysis, Design, Peer Review) (IMAFAOAK)
- akta.pro secondary industries
- Geotechnical & Subsurface Engineering Consulting (BPAHAIAB), Testing, Inspection, Certification & Commissioning (TICx) Technical Services (BPAHAIAL)
Keywords
Where Diaz Yourman & Associates is headquartered
LocationHeadquarters
- HQ city
- Santa Ana
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Diaz Yourman & Associates business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Geotechnical Consulting Services: Professional consulting services for infrastructure projects including geotechnical investigations, design recommendations, construction quality assurance, and environmental assessments. Revenue is generated through project-based contracts with government agencies, transportation authorities, and private developers.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Project-based professional services |
Go-to-market motion1 record
Distribution channels3 records
Marketing channels5 records
Diaz Yourman & Associates product offering
Product offeringCore offering
Diaz Yourman & Associates is a specialized geotechnical engineering consulting firm that delivers design, construction, environmental, and legal/forensic services for major infrastructure projects. Services span site and route evaluations, geologic hazard assessments, seismic design, ground improvement, slope stability, foundation engineering, construction observation and testing, EIR/EIS preparation, Phase I/II site assessments, remediation, and litigation support. The firm primarily serves as a geotechnical subconsultant to general contractors and government agencies on public works projects.
Product overview
Diaz Yourman & Associates (DYA) is a geotechnical engineering consulting firm that provides specialized services across four main areas: Design Services (covering site evaluations, seismic design, foundations, ground improvement, slope stability, and instrumentation), Construction Services (including observation, testing, and quality control), Environmental Services (EIR/EIS, remediation, Phase I/II site assessments), and Legal/Forensic Services (litigation support). The firm also offers custom Statement of Qualifications (SOQ) preparation. DYA operates as a subconsultant on infrastructure projects and frequently collaborates with specialty consultants in geology, geophysics, environmental testing, and laboratory services. The company holds multiple small business enterprise certifications including SBE, DBE, and MBE through California Unified Certification Program, State of California, Metro, and various port authorities.
Differentiator
Problem solved
Functional benefit
Products and services
- Design Services Comprehensive geotechnical engineering design services for infrastructure project owners, including site and route evaluations, geologic hazard assessments, seismic design, site characterization, subsurface drainage, grading, ground improvement, slope stability, foundations, dynamic analyses, pavements, and instrumentation.
- Construction Services
- Environmental Services
- Legal/Forensic Services
- Statement of Qualifications (SOQ)
Quantifiable outcome
- 200-panel PV system provides nearly 90% of electrical energy demand, achieving near net-zero consumption
- +3 more outcomes
Companies that use Diaz Yourman & Associates
Customer profileNamed customers12 records
Segments6 records
Ideal customer profiles5 records
Diaz Yourman & Associates technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
Diaz Yourman & Associates partnerships and signals
Strategic signalPartnerships
Eleven partnerships are on record, tiered core.
- JacobscoreDYA provided geotechnical services for NAVFAC AE Services for P-380 F-35C Engine Repair Facility as subconsultant to Jacobs.
- Clark/McCarthy Joint VenturecoreDYA provided geotechnical services as part of the Clark/McCarthy Joint Venture for the LAWA LAX Design-Build New Central Utility Plant project ($438 million). This was a design-build delivery method requiring close collaboration between geotechnical subconsultant and general contractors.
- Kimley-Horn and Associates, Inc.coreDYA provided geotechnical services for JWA Taxiway B Rehabilitation as subconsultant to Kimley-Horn.
- Tetra-IBI GroupcoreDYA performed geotechnical investigation for the Port of Los Angeles San Pedro Waterfront Downtown Harbor project under the Tetra-IBI Group.
- URS (Now AECOM)coreDYA was subconsultant to URS Corporation (now AECOM) for the SR-91 Corridor Improvement project, a $1.4 billion design-build project, preparing 13 foundation reports.
- Hatch Mott McDonaldcoreDYA served as geotechnical consultant working with Hatch Mott McDonald for the California High Speed Rail Authority Palmdale-LA Segment preliminary engineering phase.
- California High-Speed Rail AuthoritycoreDYA worked with Hatch Mott McDonald and directly with CHSRA for the preliminary engineering of the Los Angeles to Palmdale segment - a 60-mile corridor part of the $40-billion statewide project.
- City of AnaheimcoreDYA provided geotechnical services for the Anaheim Regional Transportation Intermodal Center (ARTIC), a $187.8 million regional transportation gateway project.
- Granite-Meyers-Rados Joint VenturecoreDYA provided Construction Quality Assurance/Quality Control services for the SR-22 Design-Build project through the Granite-Meyers-Rados Joint Venture ($606 million).
- Parsons/HNTB Joint VenturecoreDYA was geotechnical consultant for the design-build team (Parsons/HNTB Joint Venture) for the ACE Mid-Corridor Trench Design/Build, a two-mile segment of a ten-mile railroad grade separation project.
- HDR Engineering, Inc.coreDYA provided geotechnical services for the Alameda Corridor East and Temple Avenue project as subconsultant to HDR Engineering.
Scale indicators3 records
Recent moves7 records
Expansion highlights5 records
Diaz Yourman & Associates competitors and assessment
Company assessmentDirect peers
- Kleinfelder: One of the largest US geotechnical, environmental, and construction services consulting firms; competes head-to-head with DYA on California infrastructure, transportation, water, and energy scopes. Closest scale and service-line analog to DYA, though larger and multi-region.
- Geo-Logic Associates: California-based geotechnical and geoscience consulting firm with comparable service mix (site characterization, foundation design, slope stability, seismic). Direct mid-size competitor on California infrastructure and water projects.
- Earth Systems Consultants: California geotechnical engineering and engineering geology firm serving public agencies and private developers across the same transportation, port, water, and building sectors as DYA.
- Haley & Aldrich: Mid-size US geotechnical, environmental, and construction consulting firm with similar differentiated specialty positioning against multi-discipline giants, serving transportation, ports, airports, and water infrastructure clients.
- GeoEngineers: Mid-size geotechnical and environmental consulting firm serving transportation, water, energy, and port infrastructure clients; comparable project-based professional services model with similar specialty differentiation.
- SAGE Engineers: California-focused geotechnical and structural engineering consulting firm serving public agencies on similar transportation, water, and municipal infrastructure scopes; closest regional scale comparable to DYA.
Broad incumbents
- Terracon Consultants: Large US engineering consulting firm with extensive geotechnical, environmental, and materials testing services across multiple regions; competes with DYA on California scopes as a broad incumbent.
- AECOM: Global multi-discipline engineering giant (includes legacy URS). Competes against DYA both for design-build primes (where DYA is a subconsultant) and for large California infrastructure scopes.
- Jacobs Engineering Group: Global professional services firm with extensive geotechnical capabilities via NAVFAC AE Services contracts and other public works; serves as both a DYA subconsultant-prime (e.g., NAVFAC P-380) and competitor on broader scopes.
- Fugro: Global geotechnical, survey, and geoscience services firm with strong offshore/waterfront and infrastructure capabilities; competes on large port and marine geotechnical scopes where DYA also operates (e.g., POLA Pier 400, Port of Long Beach).
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights5 records
Customer concentration
Diaz Yourman & Associates social profiles
Digital presenceDiaz Yourman & Associates compliance and trust
Trust signalCompliance7 records
Diaz Yourman & Associates financial estimates
Financial estimateRevenue estimate
Valuation estimate
Diaz Yourman & Associates leadership team
Management profileNumber of profiles
Profiles12 records
Diaz Yourman & Associates funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Diaz Yourman & Associates M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Diaz Yourman & Associates
What does Diaz Yourman & Associates do?
Diaz Yourman & Associates is a specialized geotechnical engineering consulting firm that delivers design, construction, environmental, and legal/forensic services for major infrastructure projects. Services span site and route evaluations, geologic hazard assessments, seismic design, ground improvement, slope stability, foundation engineering, construction observation and testing, EIR/EIS preparation, Phase I/II site assessments, remediation, and litigation support. The firm primarily serves as a geotechnical subconsultant to general contractors and government agencies on public works projects.
Is Diaz Yourman & Associates a public or private company?
Diaz Yourman & Associates is a private company. It is classified as management employee owned and is currently operating.
When was Diaz Yourman & Associates founded?
Diaz Yourman & Associates was founded in 1992. It employs 11 to 50 people.
Where is Diaz Yourman & Associates based?
Diaz Yourman & Associates is headquartered in Santa Ana, United States, in the North America region.
How does Diaz Yourman & Associates make money?
One revenue line is on record: geotechnical Consulting Services.
Who are Diaz Yourman & Associates's main competitors?
Direct peers on record are Kleinfelder, Geo-Logic Associates, Earth Systems Consultants, Haley & Aldrich, GeoEngineers and SAGE Engineers. Broad incumbents are Terracon Consultants, AECOM, Jacobs Engineering Group and Fugro.
Does Diaz Yourman & Associates have an API?
No public API is recorded for Diaz Yourman & Associates.
What industry is Diaz Yourman & Associates in?
Diaz Yourman & Associates's product category is Geotechnical Engineering Consulting. Its primary akta.pro industry code is IMAFAOAK, Geotechnical Design, Engineering & Consulting (Analysis, Design, Peer Review), with a secondary code of BPAHAIAB, Geotechnical & Subsurface Engineering Consulting. Its NAICS code is 541330 and its SIC code is 8711.