800-832-7711

Acorn Onsite, Inc. - Serving septic system needs for California
Acorn Onsite, Inc. - Serving septic system needs for California
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  • About Acorn
  • Locations Served
  • Acorn's Services
  • Engineering
  • Contact Us
  • Septic Basics
    • Septic Info & Basics
    • Regulations
    • Glossary
    • Septic Tanks
    • Leach Fields
    • Dispersal Field Types
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    • Home
    • About Acorn
    • Locations Served
    • Acorn's Services
    • Engineering
    • Contact Us
    • Septic Basics
      • Septic Info & Basics
      • Regulations
      • Glossary
      • Septic Tanks
      • Leach Fields
      • Dispersal Field Types
    • Project Types

800-832-7711


  • Home
  • About Acorn
  • Locations Served
  • Acorn's Services
  • Engineering
  • Contact Us
  • Septic Basics
  • Project Types

It's important to know who you're working with.

Acorn Onsite, Inc. is an established Civil Engineering firm that specializes in septic systems. We enjoy working with our customers on the most difficult septic system projects as well as the more straightforward sites throughout northern& central California and now serving the Hawaiian Islands. We have a particular expertise in the field that justifies our involvement in your project. Our office is centrally located, allowing us to efficiently provide our services in a wide region.

Our Credentials

Reach out to discuss more of your septic system needs

925-447-5200

About Acorn Onsite, Inc.

Serving the OWTS needs of all California Counties

Acorn Onsite, Inc. provides complete solutions for onsite wastewater. Members of our staff have been in the wastewater industry since 1980. Acorn Onsite, Inc. was incorporated in 2006.


Acorn Onsite, Inc.'s unique for the industry approach of providing all septic system services under one
company will benefit you, the customer, by having the skills, knowledge, understanding, and tools for the complete project, start to finish. Although we are competent working through all aspects of the project, our primary involvement is the investigation for and design of septic systems. We enjoy working with others in the industry with each of us performing our part.


Our staff enjoys working through your project and providing you with a long-term wastewater solution. We provide you with sound, knowledgeable advice, giving you the confidence you deserve.


We work on behalf of our customer to navigate the regulations appropriately.   


Acorn's staff enjoys working with all types of clients throughout the septic system development process. Including property owners, engineers, architects, contractors (both specialty and general), real estate agents, property owner's representatives, property purchasers, first time septic system owners, and everyone in between.


Give us a call today at 800-832-7711 to discuss how we can put our expertise to the test on your next project or septic system process.

A sloping hillside in the feasibility determination stage of septic system engineering design.

A sloping hillside in the feasibility determination stage of septic system engineering design.

Our Staff

Tim Johnston civil engineer evaluating the surface condition for septic system engineering purposes.

Tim Johnston, PE

Tim Johnston, PE

Tim Johnston, PE

Civil engineer Tim Johnston has a lifetime of experience working at all levels of septic system projects.

Kevin Johnston with Acorn Onsite, Inc. observing a soil profile for septic system feasibility.

Kevin Johnston

Tim Johnston, PE

Tim Johnston, PE

Kevin is following in his father's footsteps serving the need for appropriate septic system expertise. 

Acorn Onsite, Inc. is a Civil Engineering firm specializing in septic systems. We serve all counties throughout Northern California and Central California.

Acorn Onsite, Inc. 925-447-5200 or 800-832-7711

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