| A B C Sewer And Drain | Adam Christopher Maldonado | — | (707) 994 4411 | Other | Lakeport · Lake County | — | — |
| A-t Wanzer Grading And Excavating INC | Anthony James Wanzer | — | (707) 262 0799 | Other | Lakeport · Lake County | — | — |
| Aaa Pump Service | Matthew Allen Black | — | (707) 349 5113 | Other | Lakeport · Lake County | — | — |
| Action Sanitary INC | Jerry Lee Campo | — | (707) 994 5068 | Other | Lower Lake · Lake County | — | — |
| Amazing Kind Miracles | Amazing Kind Miracles | — | (707) 994 4423 | Other | Lower Lake · Lake County | — | — |
| Andrew Jonathon Jones | Andrew Jonathon Jones | — | (850) 485 5191 | Other | Lakeport · Lake County | — | — |
| Aquarius Water Systems | David Glenn Clark | — | (707) 262 2963 | Other | Cobb · Lake County | — | — |
| Arbeez Plumbing | Arbeez Plumbing | — | (707) 349 1200 | Other | Clearlake Oaks · Lake County | — | — |
| Audac | Brian Keith Laws | — | (415) 459 3095 | Other | Clearlake Oaks · Lake County | — | — |
| Balentine Wood Flooring Co | Robert Michael Balentine | — | (707) 322 1632 | Other | Lakeport · Lake County | — | — |
| Barnett Marine Engineering LLC | Scott Jason Barnett | — | (707) 245 4823 | Other | Upper Lake · Lake County | — | — |
| Bernard Krahne | Bernard Krahne | — | (707) 231 7686 | Other | Clearlake Oaks · Lake County | — | — |
| Blake's Backhoe Service | Blake Adelbert Fifield | — | (707) 738 2892 | Other | Lakeport · Lake County | — | — |
| Brian Pr Davis DBA Northern Industrial Construction | Brian Patrick Rile Davis | — | (619) 729 3915 | Other | Kelseyville · Lake County | — | — |
| Bruce E St Cyr Gen Eng Contractor | Bruce Eugene St Cyr | — | (707) 489 1439 | Other | Lower Lake · Lake County | — | — |
| C C S Crabtree Communication Solutions | Scott Nathan Crabtree | — | (707) 972 8000 | Other | Kelseyville · Lake County | — | — |
| C K Excavating And Demolition | C K Excavating And Demolition | — | (707) 291 5665 | Other | Middletown · Lake County | — | — |
| C&s Civil LLC | Travis Allen Coleman | — | (707) 489 9599 | Other | Lakeport · Lake County | — | — |
| Cal Core INC | James Charles Iii Darcy | — | (650) 201 0573 | Other | Kelseyville · Lake County | — | — |
| Cal Tech Pump Well & Compressor INC | Scott Matthew Brown | — | (707) 987 4488 | Other | Middletown · Lake County | — | — |
| Caliber Carpets And Flooring | Caliber Carpets And Flooring | — | (707) 481 2277 | Other | Lakeport · Lake County | — | — |
| Carreker Plumbing | Carreker Plumbing | — | (707) 355 0044 | Other | Middletown · Lake County | — | — |
| Case Excavating INC | Brian Wayne Case | caseexcavating@yahoo.com | (707) 994 6815 | Other | Clearlake · Lake County | — | — |
| Cb Plumbing | Cb Plumbing | — | (707) 350 5179 | Other | Kelseyville · Lake County | — | — |
| Chatham Plumbing LLC | Dominic Kenneth Chatham | chathamplumbing@gmail.com | (702) 810 4332 | Other | Middletown · Lake County | — | — |
| Chernoh Excavating INC | Joshua Isaac Chernoh | — | (707) 995 1359 | Other | Lower Lake · Lake County | — | — |
| Coleman Construction LLC | Tracy Allen Coleman | — | (707) 275 9016 | Other | Upper Lake · Lake County | — | — |
| Coleman Plumbing | Coleman Plumbing | — | (707) 292 4262 | Other | Lakeport · Lake County | — | — |
| Country Carpets | Country Carpets | — | (707) 275 2000 | Other | Upper Lake · Lake County | — | — |
| Cramer Enterprises | Eric Jason Cramer | — | (707) 349 8575 | Other | Lakeport · Lake County | — | — |
| Cruz Concrete | Cruz Concrete | — | (707) 245 0229 | Other | Nice · Lake County | — | — |
| D & D Fence | D & D Fence | — | (707) 275 0182 | Other | Upper Lake · Lake County | — | — |
| D And K Engineering | Derek Loren Desoto | — | (707) 355 0205 | Other | Middletown · Lake County | — | — |
| D S Concrete INC | Dale Francis Soditus | — | (707) 350 2243 | Other | Clearlake · Lake County | — | — |
| Dallas Woll INC DBA Roto Rooter Of Lake County | Victoria Jean Christie | — | (707) 349 4982 | Other | Kelseyville · Lake County | — | — |
| Davis Fabrication & Ornamental Designs | Darrell Lynn Davis | — | (707) 263 5858 | Other | Lakeport · Lake County | — | — |
| Delong Plumbing | Delong Plumbing | — | (707) 495 1028 | Other | Hidden Valley Lake · Lake County | — | — |
| Dennis Grove Concrete Pumping INC | Martha Brooke Grove | info@dennisgroveconcretepumping.com | (707) 575 6840 | Other | Middletown · Lake County | — | — |
| Derek J Andress | Derek J Andress | — | (707) 337 1491 | Other | Hidden Valley Lake · Lake County | — | — |
| Dirtworx General Engineering | Dirtworx General Engineering | — | (707) 318 4441 | Other | Kelseyville · Lake County | — | — |