Permeable Base Rock – Caltrans Class II Permeable Aggregate
Bulk Delivery Across the Bay Area Northern California
Engineered for drainage and compliance, our permeable base rock meets Caltrans Section 68 and ASTM standards, making it the preferred choice for contractors, engineers, and architects designing permeable pavement systems, stormwater BMPs, and drainage layers.
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Meets Caltrans Section 68 Class II Permeable & ASTM C33 drainage aggregate standards
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Available in angular ¾″ gradations
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Designed for stormwater infiltration, permeable pavements, and drainage blankets
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Bulk dump truck delivery across Marin, Sonoma, Alameda, Contra Costa, San Francisco, San Mateo, and Contra Costa counties
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Submittal sheets available upon request for engineers and inspectors
Product Specs & Gradations
Available Sizes
We stock permeable base rock in multiple gradations to meet engineering specifications:
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¾″ Permeable Base Rock – most common size for permeable pavement systems.
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1½″ × ¾″ Angular Rock – stable sub-base for infiltration trenches and bioswales.
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2″ × 3″ Angular Rock – ideal for drainage blankets and heavy-duty infiltration systems.
Compliance & Standards
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Meets Caltrans Section 68 (Class II Permeable) requirements.
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Conforms to ASTM C33/C136 for drainage aggregate.
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Submittal sheets available upon request for contractors, engineers, and municipal inspectors.
Applications & Use Cases
Permeable base rock is engineered for both structural stability and stormwater infiltration, making it the preferred choice for projects where drainage and compliance are critical.
Common Applications
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Permeable Pavement Systems – Base layer for porous asphalt, pervious concrete, and permeable interlocking concrete pavers (PICP).
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Infiltration Trenches & Bioswales – Provides void space for water storage and gradual infiltration.
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Stormwater Management BMPs – Required in Low Impact Development (LID) designs to meet municipal and CalGreen stormwater regulations.
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Drainage Blankets & Sub-Drains – Free-draining material for roadways, retaining walls, and utility backfill.
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Green Infrastructure Projects – Supports LEED v4 credits for Sustainable Sites and stormwater management.
Why Contractors & Engineers Choose It
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Regulatory Compliance – Meets Caltrans Section 68, ASTM C33/C136, and Bay Area stormwater permit requirements.
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Dual Functionality – Provides load-bearing support while promoting infiltration and runoff reduction.
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Proven Performance – Reduces hydrostatic pressure, improves drainage, and extends pavement life.
Delivery & Ordering Information
At North Bay Materials, we make it easy for contractors, engineers, and architects to source permeable base rock with fast, reliable delivery.
Delivery Service
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Service Areas: Alameda, Contra Costa, San Francisco, San Mateo, Marin, and Contra Costa counties
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Method: Bulk delivery via dump truck (hourly trucking rate applies)
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Minimum Order: 10+ tons (per truckload)
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Scheduling: Same-day and next-day delivery may be available on request
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Loading & Placement: Delivered directly to job sites, staging areas, or material yards
Ordering Options
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Request a Quote: For multi-truck or project-based orders (contractors & engineers).
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Add to Cart: Purchase directly through our online store for quick checkout for smaller orders
Why Buy From North Bay Materials?
Choosing the right supplier is just as important as choosing the right aggregate. At North Bay Materials, we understand the demands of professional construction projects and provide more than just rock — we provide reliability.
Contractor-Focused Advantages
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Caltrans & ASTM Compliance – All permeable base rock products meet Caltrans Section 68 and ASTM C33/C136 specifications.
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Submittals Upon Request – Gradation reports and compliance documentation available for project approval.
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Fast Local Delivery – Serving Marin, San Francisco, Alameda, Sonoma and Contra Costa counties with bulk dump truck service.
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Large Project Ready – Scalable supply for roadways, commercial developments, municipal infrastructure, and private builds.
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Expert Support – Our team has over a decade of experience working with contractors, engineers, and architects on North Bay projects.
When you order from North Bay Materials, you get more than aggregate — you get a partner who ensures your materials meet design requirements and arrive on time, every time.
Order Permeable Base Rock Today
Make sure your project meets both structural and stormwater requirements with Caltrans-approved permeable base rock. Whether you’re specifying for a municipal roadway, designing a permeable pavement system, or managing stormwater infiltration on a commercial site, North Bay Materials has you covered.
Ready to Get Started?
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Bulk dump truck delivery across San Francisco, Marin, Sonoma, Contra Costa, Alameda and San Mateo counties
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Submittal sheets available upon request for engineering and compliance approval
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Online ordering with add-to-cart convenience for smaller loads
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Contractor quotes available for multi-truck or project-scale deliveries
Frequently Aske Questions - Permeable Base Rock
Q. What is permeable base rock used for?
A. Permeable base rock is used as a drainage and structural layer in permeable pavement systems, infiltration trenches, stormwater BMPs, and drainage blankets. It allows water to infiltrate while providing stability for construction projects.
Q. Does permeable base rock meet Caltrans and ASTM standards?
A. Yes. North Bay Materials' permeable base rock meets Caltrans Section 68 (Class II Permeable) and conforms to ASTM C33/C136 drainage aggregate specifications. Submittal sheets are available upon request for contractors and engineers.
Q. How is permeable base rock delivered?
A. Permeable base rock is sold per ton and delivered in bulk by dump truck across Alameda, Contra Costa, San Francisco, San Mateo, Marin, Napa, Sonoma, and Solano counties. Delivery is billed at $150/hour with a 10+ ton minimum order.