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Excellence in underground engineering since 1970. Specialties: storm drains, water, sewer, fire protection, natural gas, excavations and more.

Explore Company

Premium underground electrical systems that keep communities running. Specialties: public utilities, telecom, joint trenching, security and more.

Explore Company

Excellence in underground engineering since 1970. Specialties: storm drains, water, sewer, fire protection, natural gas, excavations and more.

Explore Company

Quality. Integrity. Service.

The Preston Companies bring extensive expertise and hands-on partnership to complex projects. Our services include excavating and installing underground wet and dry utilities, soils testing and management, and fill site management.

About Preston

Graders, Excavators and Pavers

We partner with excavating, grading, and paving contractors to provide cost effective solutions for your soil export and import.

Preston Companies represents the fusion of Preston Pipelines, Preston Electric and DirtMarket. Together, these businesses represent the finest in wet and dry utilities, soils testing and management, and fill site management.

Our Promise


Maximize Value, Minimize Risk

Preston Companies’ provides cost effective solutions for soil to permitted sites with acceptance criteria, protecting owners and contractors from risk. Maximize clean soil by delineating and minimize contamination.


Fill the Need

Managing your material needs with our large network and skilled staff to find the best solutions whether it be import or export of soil


Solving Underground Obstacles

To relieve miscommunication and stress, Preston Companies’ combined our wet and dry utility installation services for both onsite and offsite projects.


Puzzle Solving, Perfected

By analyzing all of the pieces of a project, we are able to create a picture perfect solution that best suits your needs and your budget.


Quality, Integrity, Service.

It’s the way we do business.

We Understand Your Needs

PPI and PE can team with graders, excavators and pavers so you can provide a complete site package to the owner. We can also provide a complete BIM package as well as GPS as-builts. Our professional management provides a seamless coordination amongst all site activities. 

DirtMarket can assist with identifying clean and approved material that meets your specifications including locate, procure, haul and place. We are also willing and able to assist you in your drilling needs. 

Clean re-use

Commericial re-use

Class 2 daily cover

Class 2 deep bury


Class 1 RICRA

Class 1 RICRA stabilized

Class 1 RICRA incinerated

Frequently Asked Questions


What services can Preston Companies’ provide for my project?

Preston Companies delivers consolidated site utility solutions. For onsite and offsite instances, we provide wet and dry utility installation, and installation of specialty equipment such as pump stations, traffic signalization, grease interceptors, etc. We also provide supply dirt management solutions, such as the legal import, export, and/or disposal of native soils.


Why should I choose Preston Companies to serve my project needs?

With over 50 foremen and crews, Preston Companies is one of the largest underground utility and dirt management contractors in California. Our large, expertly trained team gives us the flexibility to serve our clients quickly and efficiently.


What are Preston Companies’ design-build capabilities?

Preston Companies takes a collaborative approach to design-build. We partner directly with leading engineering firms to deliver design-build projects to our clients.


I need help with budgets for my upcoming project. Can Preston Companies help?

Yes, Preston Companies has extensive estimating resources across all of our disciplines, and can help you define a project scope and related budget.


My company does mostly interior improvements, but we are being asked to include site electrical scope in an upcoming bid package. How can Preston Companies help me win this job?

We understand that some Electrical companies are not equipped to self-perform excavation work, or other scopes that require the use of heavy equipment. We can help you complete your bid package, and leverage our extensive fleet of equipment to execute trenching, backfilling, compaction, hoisting and setting of special equipment.


Is Preston Electric signatory to the IBEW?

Yes, Preston Electric is a union electrical contractor, capable of handling all C-10 licensed work.


We are beginning the soils analytics portion of our project. What can Preston Companies do to help this process?

You can leverage a variety of services provided by Dirt Market, a Preston Company. Our drilling machines are equipped with Shelby Tube technology to provide comprehensive dirt sampling that identifies your site’s unique soil characteristics. Samples are then taken to a lab for analysis, reviewed by our expert team, and matched up with a proper and legal disposal site.


When should we engage Dirt Market for these services?

The sooner the better. Often, customers wait until the construction phase of work to get soil analysis done. This can adversely affect the overall site schedule and logistics, as stockpiles continue to grow while sampling and analysis are being done. Executing soil sampling and analysis in the preconstruction phase allows you to move dirt as soon as construction begins.

For more information about Preston Pipelines, Preston Electric or DirtMarket and how we can meet your needs, please contact us by either phone or email and we will be able to assist you.

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