Diversified Environmental Field Services in California

Supporting Your Site Assessment and Remediation Needs for Over 20 Years

At Diversified Environmental Field Services (DEFS), we are proud to be a trusted partner for environmental consultants, engineers, and regulatory professionals across Southern California. With over two decades of experience, we specialize in providing accurate and efficient field support for Phase II and Phase III site investigations, pilot testing, and remediation projects.

Our mission is simple: to deliver high-quality environmental field services with a strong focus on safety, compliance, and professionalism.

Our Core Services
We offer a complete range of services to support environmental site assessments and cleanups:

Soil Sampling
Precise soil collection using advanced equipment for contamination assessment.

Groundwater Sampling
Monitoring well installation and groundwater sampling for clean-up planning.

Vapor Intrusion Sampling
Sub-slab and soil gas sampling to evaluate vapor migration risks.

Pilot Testing
Including Soil Vapor Extraction (SVE), Dual-Phase Extraction (DPVE), and Air Sparging to evaluate site-specific remediation options.

Drilling Services
Direct Push, Hollow Stem Auger, and Limited Access Drilling to suit any site conditions.

Environmental Construction & System Installation
From trenching and piping to full remediation system build-outs, we support long-term solutions on-site.

Why Choose DEFS?
1- Experience – Over 20 years serving California’s environmental industry.

2- Certified Team – HAZWOPER-trained field technicians and licensed drillers.

3- Reliable Equipment – Well-maintained trucks, trailers, vacuums, compressors, and testing units.

4- Fast Turnaround – Timely project execution and responsive support.

5- Regulatory Compliance – We follow local, state, and federal environmental safety standards.

Whether you need a simple sampling crew or full-site support, DEFS has the team, tools, and expertise to get the job done right.