Bulk Aggregate Supply for Drainage, Base & Construction Projects

Contra Costa Quarry Rock is a versatile, contractor-grade aggregate collection sourced from local Northern California quarries and delivered directly to your job site. This product line includes a full range of sizes—from quarry fines (dust) to large drain rock and rip rap—making it ideal for everything from paver prep and pathways to drainage systems, driveways, and structural base layers. Designed for Bay Area soil conditions, these materials are trusted by homeowners, landscapers, and contractors across Concord, Walnut Creek, Benicia, Fairfield, Antioch, Richmond, San Ramon, Vacaville, Brentwood, Danville.

Why This Product Ranks High for Real Projects

• Multiple Sizes Available: One source for all your aggregate needs

• Excellent Drainage Performance: Clean, angular rock promotes water flow

• Compaction Options: Road base and fines compact tightly for stable foundations

• Locally Sourced: Reduced haul time = faster delivery and fresher material

• Bulk Delivery Ready: Optimized for dump truck loads

Common Uses

• French drains & trench backfill

• Driveway base & resurfacing

• Paver patios & walkways

• Retaining wall backfill

• Erosion control & slope stabilization

• Foundation drainage systems

Available Sizes & Applications

Contra Costa Quarry Rock is available in a wide range of sizes, each engineered for specific construction and landscaping applications. Choosing the right size is critical for performance, longevity, and drainage efficiency.

1/4" Quarry Fines (Sand-Dust)

• Description: Very fine crushed stone with good compaction ability

• Best For: Paver bedding, pathways, artificial turf base, surface leveling

• Pro Tip: Compacts tight—ideal for creating a smooth, stable finish layer

1/4" Washed Rock

• Description: Clean, fine aggregate with minimal dust

• Best For: Paver bedding where drainage is needed, leveling layers

• Pro Tip: Better drainage than fines but less compaction

3/8" Drain Rock

• Description: Small, angular clean rock

• Best For: French drains, pipe bedding, trench backfill

• Pro Tip: Great balance between drainage and workability in tight spaces

3/4" Road Base (Aggregate Base)

• Description: Blend of crushed rock and fines designed to compact hard

• Best For: Driveways, patios, paver base, structural foundations

• Pro Tip: Must be compacted in lifts for maximum strength

3/4" Drain Rock

• Description: Clean, angular rock with no fines

• Best For: Retaining wall backfill, drainage systems, foundation drains

• Pro Tip: One of the most commonly used drainage materials in the Bay Area

1.5" Drain Rock

• Description: Larger clean rock for heavy-duty drainage

• Best For: Culverts, deep drainage systems, erosion control

• Pro Tip: Allows maximum water flow in high-volume drainage areas

Additional Sizes Available (Special Order / Bulk Projects)

• 1/2" Drain Rock

• 3/4" Permeable Base

• 3" Drain Rock

• Gabion Rock (3x6, 4x9)

• Rip Rap (½ ton, 1 ton, 2 ton, 3+ ton)

• 9–18" Backing Rock

Delivery & Ordering – Contra Costa Quarry Rock

We specialize in bulk quarry rock delivery across the Bay Area, making it easy for homeowners, contractors, and landscapers to get the right material—delivered directly to your job site.

Dump Truck Delivery Options

We use driveway-friendly dump trucks designed for residential and commercial access:

Small Dump Truck:

• 5–7 cubic yards (gravel, rock, sand, DG)

• Ideal for tight streets, driveways, and smaller projects

Large Dump Truck:

• 17–20 cubic yards (gravel, rock, sand, DG)

• Best for contractors, large driveways, and bulk orders

Service Areas

We deliver Contra Costa Quarry Rock throughout:

• Contra Costa County (Walnut Creek, Concord, Danville, Brentwood)

• Solano County (Vacaville, Dixon, Benicia, Rio Vista)

• Alameda County (Oakland, Berkeley, Fremont, Hayward)

• San Francisco & San Mateo Counties

Delivery Requirements (Important)

• Clear access: Minimum ~10 ft width

• Overhead clearance: No low wires, trees, or obstructions

• Dump area must be flat, stable, and accessible

• Driver will place material in the safest possible location

Pro Tip: Order slightly more than needed to account for compaction and waste—especially for road base and quarry fines.

FAQs – Contra Costa Quarry Rock

What is the difference between drain rock and road base?

• Drain Rock: Clean, angular rock with no fines, designed for water flow and drainage

• Road Base: Blend of rock + fines that compacts tightly for structural support

  Use drain rock for drainage systems and road base for driveways, patios, and foundations

What size quarry rock should I use for drainage?

• 3/4" Drain Rock → Most common for French drains and retaining walls

• 3/8" Drain Rock → Best for tight spaces and pipe bedding

• 1.5" Drain Rock → Ideal for heavy-duty or high-volume drainage

How much quarry rock do I need?

It depends on your project size, but here’s a quick rule: 1 cubic yard covers ~100 sq ft at 3” depth

For base layers (like road base), plan for 4–6 inches depth.

Use our material calculator for estimated quantities.

Does quarry rock compact?

Quarry fines and road base compact very well but drain rocks not so much.