Acorn Onsite, Inc. is an established Civil Engineering and Construction firm based in Livermore, CA. We serve the entire Northern California and Central California region. We have a particular expertise in our field that justifies what may appear as an extended service area. Our practical approach to finding a solution results in efficiently handling the most difficult onsite wastewater projects and more straightforward sites alike. We use our knowledge of applicable regulations, in house design equipment, ability to work with local installers, upkeep of current knowledge, and our expert knowledge of septic systems and onsite wastewater throughout your project. Give us a call today to discuss how we can put our years of experience to work for you.

Call today to speak with an engineer

Call us today to discuss your project 925-447-5200

Serving all Northern and Central California Counties

Alameda County

We provide a complete approach toward the onsite wastewater needs of Livermore, Pleasanton, Sunol, Hayward, Fremont, Altamont, Oakland, and all of Alameda County.  

Specific for Alameda County

Contra Costa County

We provide our servces throughout Contra Costa County. Including the areas of Tassajara, Danville, San Ramon, Walnut Creek, Lafayette, Concord, Byon, Brentwood, Discovery Bay, Oakley, Knightsen, Antioch, Martinez, Richmond, and all over.

Just for you

Santa Clara County

We provide our practical approach while working on projects in Milpitas, Santa Clara, San Jose, Almaden, Los Gatos, Saratoga, Cupertino, Morgan Hills, San Martin, Gilroy, Mt Hamilton, Mountain View, Palo alto, Redwood City and through Santa Clara County.

In Silicon Valley

San Mateo County

Working with the character of San Mateo county in Half Moon Bay, San Gregorio, Woodside, Redwood City, Montara, Moss Beach, Pacifica, La Honda, Los Altos Hills, Portola Valley, and throughout San Mateo County.

In the County

Solano County

Just across the water from us we service the septic system needs of Vallejo, American Canyon, Birds Landing, Rio Vista, Fairfield, Vacaville, Dixon, Lake Berryessa, Pleasants Valley, and throughout Solano County.

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Monterey County

With the new regulations effecting the Santa Lucia Preserve, Carmel, Aromas, Salinas, and all of Monterey County, don't shy away from your dreams. We have the right approach specific for Monterey County.

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All Northern and Central California Counties

Civil Engineering services for Septic Systems throughout:

Acorn Onsite, Inc. provides Civil Engineering services for septic systems in all Northern and Central California Counties. These  counties include:

  • Alameda County
  • Alpine County
  • Amador County
  • Butte County
  • Calaveras County
  • Colusa County
  • Contra Costa County
  • Del Norte County
  • El Dorado County
  • Fresno County
  • Fresno County
  • Glenn County
  • Humboldt County
  • Inyo County
  • Kern County
  • Kings County
  • Lake County
  • Lassen County
  • Madera County
  • Mariposa County
  • Mendocino County
  • Merced County
  • Modoc County
  • Mono County
  • Monterey County
  • Napa County
  • Nevada County
  • Placer County
  • Plumas County
  • Sacramento County
  • San Benito County
  • San Francisco County
  • San Joaquin County
  • San Luis Obispo County
  • San Mateo County
  • Santa Barbara County
  • Santa Clara County
  • Santa Cruz County
  • Shasta County
  • Sierra County
  • Siskiyou County
  • Solano County
  • Sonoma County
  • Stanislaus County
  • Sutter County
  • Tehama County
  • Trinity County
  • Tulare County
  • Tuolumne County
  • Yolo County
  • Yuba County

In addition to our work in California, Acorn Onsite, Inc. is actively seeking opportunities to assist developing parts of the world with wastewater treatment and disposal. Visit our International page here.

Percolation testing being conducted in the Hayward Hills, California area.

Percolation testing being conducted in the Hayward Hills, California area.