Excavation contractor jobsite in San Bernardino County, CA

Photo: Tony Hoffarth (CC BY-SA 2.0) via Wikimedia Commons

San Bernardino County, CA Contractor directory

Excavation contractors in San Bernardino County, CA

34 verified excavating and site work contractors serving San Bernardino County.

View contractors

County excavation guide

Ground conditions and project requirements in San Bernardino County

Use this local research to understand soil, seasonal constraints, permits, and jobsite logistics before choosing a contractor.

Skip to 34 contractors
Soil Regime ProfileEPA Ecoregion 79, 81 (Mojave Basin and Range, Sonoran Basin and Range)

Arizona Basin-and-Range Desert Pavement & Caliche

Dominant Soil Order: Aridisols / Entisols
Parent Material: Alluvial Fans and Basin Fill with Caliche Hardpan, Residual Bedrock Ridges

Arizona's Basin-and-Range valleys are excavator country with caveats: the upper profile is loose desert alluvium, loams, sandy loams, and gravelly fan deposits that rip and load fast, but production stops at the caliche. Cemented calcium carbonate hardpans (calcic horizons) run from 12 to 36 inches below grade across the valley floors, ranging from a tooth-scoring rind to continuous pavement that demands a ripper tooth, hydraulic hammer, or hoe-ram work. Excavators plan unit costs around caliche percentage, not depth. Desert pavement and armored fan surfaces slow the first pass; deeper cuts in the basin fill stay vertical surprisingly well in dry conditions but slake and ravel when wet. Groundwater is deep and rarely a dewatering problem, which is the region's one gift to utility crews. Monsoon-season flash flooding fills open trenches in minutes, shoring, spoil setbacks, and daily weather calls are standard. Export fill and aggregate borrow are abundant; expect long hauls only for select material.

Geographic Footprint:SW and south-central AZ: Maricopa, Pima, Pinal, Yuma, La Paz, Mohave, Cochise valleys
Geotechnical Baseline

Physical Ground Conditions & Soil Properties

Shallow Bedrock (<50 in)
9.4%of county land area

Deep soil mantle; rock refusal rare for standard basement or trench cuts.

High Shrink-Swell Clay
0.9%expansive soil

Low volumetric expansion risk in native subgrade.

Median Water Table Depth
0inches from surface

Shallow water table; active dewatering or sumps needed for deep trenching.

Hydric / Wetland Soils
2.9%hydric coverage

Indicates poor natural drainage and potential jurisdictional wetland pockets.

Steep Terrain (Slope >15%)
18.6%of terrain

Predominantly gentle to rolling slopes suitable for wheeled earthmoving.

Septic Severe Limitations
73.1%severe rate

High rate of conventional drainfield limitations; engineered or drip systems often required.

Dominant Soil Textures:SandSandy loamLoamy sand
Surface Stones / Boulders: 51.5% coverage
Compliance & Permitting

Earthwork Regulations & Permit Thresholds

Stormwater & Erosion Control
SWRCB Construction General Permit Order 2009-0009-DWQ (as amended; NOI + SWPPP required ≥1 acre; LRP applies)

Administers NPDES stormwater discharge coverage for land-disturbing construction activities.

State Threshold:1.00 Acre
Local Threshold:Follows state
Grading Permit: No separate county grading permit
Onsite Wastewater & Utilities
San Bernardino County Environmental Health / Regional Water Quality Control Board

Jurisdiction over septic tank permits, soil evaluation perk tests, and drainfield sizing.

Housing on Septic:55.0%
Soil Evaluation:OWTS Policy + county OWTS management plan: site/soil evaluation by licensed professional; percolation testing per county LAMP
Access Septic Permitting Portal →
811 One-Call Requirements
USA North 811

Mandatory notice window: 48 hours prior to mechanized earthwork (excluding weekends and legal holidays).

Licensing & Clearing Permits
Contractor License Threshold: Required for earthwork contracts exceeding $0 in California.
Burn Permit Season: Residential pile burning generally Nov–May (per-burn day authorization by local AQMD/CAL FIRE unit); Jun–Oct bans commonAuthority: CAL FIRE / county Air Pollution Control District burn permits; no-burn days by AQI forecast
Weather & Ecology

Seasonal Constraints & Clearing Windows

Design Frost Depth
0inches

Building code minimum depth for footing frost protection.

Frozen Ground Days
0days / year

Typical days with sub-freezing soil conditions affecting digging.

Wet Season Months
January, February, March, December

Peak precipitation window requiring sediment traps and soil aeration.

Supply Chain & Hazards

Logistics, Aggregate Sources & Geohazards

Aggregate & Material Supply
Colton Plant

Nearest active quarry: 3 miles haul distance.(64 active crushed stone/sand operations within 50 miles).

Flood & Hazard Overlay
FEMA 100-Yr Flood:4.4%(100% NFHL digital map coverage)
NWI Wetlands:10.0%jurisdictional coverage
Karst Terrain & Sinkhole Risk: Low

0.8% of county underlain by soluble carbonate rock formations.

HUC8 Primary Watersheds:Salton Sea, San Luis Rey-Escondido, San Diego, Southern Mojave, Middle Kern-Upper Tehachapi-Grapevine, Santa Clara
Public conservation land: 76.3% (USGS PAD-US).

Area-specific FAQ

Do I need to call before digging in San Bernardino County?

Yes. You should contact USANorth / California 811 at least 2 working days before any digging so underground lines can be marked.

Is the soil here a problem for foundations?

The Hanford soil has low shrink-swell potential, so footings should be reviewed against the local soil conditions.

When do I need a grading permit in San Bernardino County?

A grading or excavation permit from San Bernardino County Land Use Services Department is typically required once earthwork exceeds 50 cubic yards of cut or fill.

How deep do footings need to be in California?

In California, footings typically need to extend below the frost line, which is around 18 inches here. A local contractor will confirm the code requirement for your site.

Verified local listings

Excavation contractors serving San Bernardino County

34 verified listings (showing first 20)

Nearby counties

Cities in this county