Fill Dirt in Contra Costa County, CA

Prices vary by source, truck distance, and material quality, but typical delivered fill-dirt in Contra Costa County often falls in the range of about $20 to $50 per ton (roughly $25 to $65 per cubic yard using a common conversion). Exact pricing depends on local availability, the amount ordered, site access, and any hauling or spreading fees. Use Hello Gravel to get real-time quotes from local suppliers for an accurate delivered price.

Contra Costa County is served by landscape supply yards, construction material yards, and independent haulers that deliver fill-dirt for residential jobs. Hello Gravel connects you with vetted local suppliers and contracted dump truck fleets so you can compare availability, photos, and delivery options. When evaluating suppliers, ask about source material, organic content, compaction recommendations, and proof of insurance.

Many small landscaping jobs don’t require a permit, but projects that change grading, alter drainage, create slopes, or move large volumes of material often do. Contra Costa County typically requires permits and erosion control plans for larger fills or any work that affects drainage, and cities inside the county may have their own rules. Before you order large quantities, contact the Contra Costa County Department of Conservation and Development or your city planning office to confirm permit thresholds and requirements.

For structural work you want clean, well-graded fill with low organic content—often called select fill or engineered fill—placed and compacted in lifts to meet compaction specs. Native-sourced fill-dirt with clay or organics is fine for small landscaping but not for load-bearing areas; for driveways and pads use structural fill or a compactable aggregate base under the finished surface. Ask suppliers for material gradation and whether they can provide compaction guidance or testing (Proctor or compaction percentage) for your project.

Wet winters and dry summers increase the risk of erosion and seasonal shrink-swell in clay-rich areas, so good drainage and erosion control are essential when using fill-dirt. Design for runoff (swales, French drains, and proper slope), compact in recommended lifts before the rainy season, and protect exposed fills with erosion control measures until vegetated or paved. In creekside or steep locations check county regulations for additional protections against sediment runoff.

Use 100 sq ft as the base: 2 inches is about 0.62 cubic yards (roughly 0.8–0.9 tons), 4 inches is about 1.23 cubic yards (about 1.5–1.7 tons), and 6 inches is about 1.85 cubic yards (about 2.2–2.5 tons). These ton estimates assume roughly 1.2–1.4 tons per cubic yard for typical fill-dirt—ask your supplier for their specific weight so you can order the right amount. Always add 5–10% extra to allow for settling and compaction.

If placed as engineered or select fill, compacted properly and kept well-drained, the subgrade can last for decades without needing replenishment. Surface-only fills used for landscaping or slope builds may settle, erode, or wash during heavy rains and could need maintenance or top-ups within a few years. Regularly inspect for settlement, erosion rills, or drainage changes after the first rainy season and address problems early.

Fill-dirt is intended to raise grades and fill low spots—not as a finished driveway surface. For driveways and load-bearing areas use crusher-run or road base as the compactable structural layer, and top it with asphalt, paving, or stabilised decomposed granite for the finished surface. Decomposed granite can work well for low-traffic, well-drained paths but needs a proper compacted base for vehicles.

Common improvements include blending fill with clean sand or crushed rock for better drainage, using geotextile fabric to separate fill from soft native soils, or stabilizing problematic soils with lime or cement—typically after soil testing and engineer recommendations. Polymer stabilizers and binders exist but should be used with caution and local guidance; any chemical stabilizer or structural treatment should follow testing and, if required, permit or design approval. Ask your supplier or a soils engineer for local best practices before adding stabilizers.

Hello Gravel’s minimum order is 3 tons and standard delivery is typically scheduled 2+ business days out, with next-day delivery available when ordered early (fees may apply). Local suppliers serving Contra Costa County commonly have lead times from same-week to one week depending on stock, season, and site access; tight schedules are best confirmed by getting quotes from multiple local suppliers. Small loads, difficult access, or requests for tailgate spreading can increase delivery time or add fees.

Remove organic topsoil from the area before placing fill, place fill in thin lifts and compact each lift to meet compaction targets, and make sure grading directs water away from structures. Protect new fills during winter rains with erosion control measures and seed or mulch exposed areas promptly. When in doubt for structural work, get an engineer’s recommendation and request material and compaction specs from your supplier.