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Our Story
Welton Underground was founded on one simple value; Integrity. With over 30 years in the underground industry, WU has the knowledge and experience to get the job done in an efficient and safe manner while keeping a focus on prompt delivery of utility services to the site. Our goal is to service customers with quality work, good communication and build solid relationships that will bring value to the General Contractors and utility owners we work with. We specialize in all underground utilities including storm drains, sewer, water lines, fire water, communication, electric and gas. Give us a call to bid your next project, you will be happy you did.
Welton Underground has been listed in the Blue Book since 2019.
Commercial Experience
Regions & Counties Serviced
- San Francisco, Oakland, San Jose
California 22
- Alameda
- Alpine
- Butte
- Colusa
- Contra Costa
- El Dorado
- Humboldt
- Lake
- Lassen
- Marin
- Mendocino
- Napa
- Placer
- Sacramento
- San Luis Obispo
- Santa Cruz
- Shasta
- Solano
- Sonoma
- Tehama
- Yolo
- Yuba
Our CSI Codes
23 22 13.13 - Underground Steam and Condensate Heating Piping
26 05 43 - Underground Ducts and Raceways for Electrical Systems
31 01 10 - Maintenance of Clearing
31 01 20 - Maintenance of Earth Moving
31 01 50 - Maintenance of Excavation Support and Protection
31 06 10 - Schedules for Clearing
31 06 20 - Schedules for Earth Moving
31 11 00.00.01 - Clearing and Grubbing
31 12 00.00.01 - Selective Clearing
31 14 13 - Soil Stripping and Stockpiling
31 14 13.13 - Soil Stripping
31 14 13.16 - Soil Stockpiling
31 14 16 - Sod Stripping and Stockpiling
31 14 16.13 - Sod Stripping
31 14 16.16 - Sod Stockpiling
31 20 00.00.01 - Earth Moving
31 21 16.13 - Methane Venting
31 22 13 - Rough Grading
31 22 16 - Fine Grading
31 22 19 - Finish Grading
31 22 19.13 - Spreading and Grading Topsoil
31 23 16 - Excavation
31 23 16.13 - Trenching
31 23 16.16 - Structural Excavation for Minor Structures
31 23 16.26 - Rock Removal
31 23 33 - Trenching and Backfilling
33 01 60 - Operation and Maintenance of Hydronic and Steam Energy Utilities
33 01 70 - Operation and Maintenance of Electrical Utilities
33 01 80 - Operation and Maintenance of Communications Utilities
33 06 10 - Schedules for Water Utilities
33 06 40 - Schedules for Storm Drainage Utilities
33 06 60 - Schedules for Hydronic and Steam Energy Utilities
33 06 70 - Schedules for Electrical Utilities
33 09 40 - Instrumentation and Control for Storm Drainage Utilities
33 09 60 - Instrumentation and Control for Hydronic and Steam Energy Utilities
33 09 70 - Instrumentation and Control for Electrical Utilities
33 11 16 - Site Water Utility Distribution Piping
33 29 00.00.01 - Well Abandonment
33 33 13 - Sanitary Utility Sewerage
33 33 16 - Combined Utility Sewerage
33 34 13 - Sanitary Utility Sewerage Inverted Siphons
33 41 13 - Public Storm Utility Drainage Piping
33 50 00.00.01 - Fuel Distribution Utilities
33 51 13 - Natural-Gas Piping
33 60 00.00.01 - Hydronic and Steam Energy Utilities
33 61 13 - Underground Hydronic Energy Distribution
33 61 23 - Aboveground Hydronic Energy Distribution
33 63 13 - Underground Steam and Condensate Distribution Piping
33 70 00.00.01 - Electrical Utilities
33 71 19 - Electrical Underground Ducts and Manholes
33 71 39.23 - Underground High-Voltage Wiring
33 71 49.23 - Underground Medium-Voltage Wiring
33 79 19 - Utilities Grounding
33 79 19.13 - Electrical Utilities Grounding
33 79 19.16 - Communications Utilities Grounding
35 41 16 - Levee Cutoff Trenches
40 23 36 - Sanitary Water Process Piping
